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Maricato, Efeso Francisco de Melo. "Sensor Hall de GaAs por implantação de ions." [s.n.], 2000. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259222.
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Orientador: Jacobus W. SwartDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: Neste trabalho projetamos, fabricamos e caracterizamos sensores magnéticos de efeito Hall. Realizamos um estudo sobre os princípios físicos envolvidos e figuras de mérito dos sensores (Tensão Hall, Sensibilidade, Tensão offset, Linearidade, Ruído e Coeficiente de temperatura) e, então, projetamos sensores Hall de várias geometrias, obtendo dispositivos com diferentes sensibilidades. Fabricamos estes dispositivos em camadas ativas de diferentes espessuras e dopagens com o objetivo de estudar o efeito destas variáveis na sensibilidades e linearidade dos dispositivos. O processo de fabricação desenvolvido é compatível com o processo de fabricação de transistores MESFET. Após o projeto dos sensores e processo de fabricação, fabricamos 5 níveis de máscaras através de um equipamento de feixe de elétrons. As camadas ativas foram obtidas por duas diferentes técnicas: implantação de íons e crescimento epitaxial. As regiões ativas implantadas foram dopadas com íons de 'SI POT. + SOB. 29¿ e a camada epitaxial dopada com silício, de modo que a concentração de portadores na camada ficasse na ordem de 1,0 x ¿10 POT. 17¿ 'CM POT. 3¿ e a espessura entre 0,2 - 0,5 'MU¿m. Após o encapsulamento dos dispositivos, caracterizamos os sensores com polarização de 1 - 7 mA e indução magnética entre O - 1,2 T (tesla). Os sensores fabricados apresentaram alta sensibilidade (88 - 820 V/A.T), tensão offset esperada e alta linearidade. Propomos alguns estudos sobre melhorias do processo de fabricação e sobre circuitos de condicionamento de sinais. ...Observação: O resumo, na íntegra, poderá ser visualizado no texto completo da tese digital
Abstract: In this work we designed, fabricated and characterized Hall-effect magnetic sensors. We studied the involved physical principies and figures of merit of sensors (Hali voltage, Sensitivity, Offset voltage, Linearity, Noise and Temperature coefficient) and, then, we designed Hall sensors of different shapes, obtaining devices with different sensitivities. We fabricated these devices in active layers of different thicknesses and doping levels with the objective to study the effect of these variables on the sensitivity and linearity of the devices. The developed process is compatible with the fabrication process of MESFET transistors. After the design of the sensorsand the process,we fabricateda set of 5 levels of masks through an electron-beam equipment. The active layers have been obtained by two different techniques: ion implantation and epitaxial growth. The implanted active regions have been doped with ions of 'SI POT. + SOB. 29¿ and the doped epitaxial layer with silicon, so that the concentration of carriers in the layer was of the order of 1,0 x ¿10 POT. 17¿¿CM POT. 3¿ and the thickness between 0.2 - 0.5 'MU¿m.After the packaging of the devices, we characterized the sensors with current bias of 1 - 7 mA and magnetic induction between O - 1.2 T (tesla).The fabricated Hall sensors presented high sensitivity (88 - 820 V/A.T), low offset voltage and high linearity. Based on the results, some additional studies on improvements on the fabrication process and the signal conditioning circuits are suggested. ...Note: The complete abstract is available with the full electronic digital thesis or dissertations
Mestrado
Mestre em Engenharia Elétrica
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Gonzales, Vizcarra Isaac Guillermo, and Aranda Walter Santiago Campos. "Sistema de levitación magnética usando sensor de efecto hall." Bachelor's thesis, Universidad Ricardo Palma, 2014. http://cybertesis.urp.edu.pe/handle/urp/1179.
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Los sistemas de suspensión magnética vienen usándose actualmente en aplicaciones diversas como trenes de alta velocidad; rodamientos para ejes de alta velocidad; motores lineales; entre otras aplicaciones que se encuentran en sistemas de transporte, equipos médicos, motores usados en ambientes limpios (clean-rooms), etc.
Estos sistemas pueden ser del tipo atractivo o repulsivo. El primero ha sido desarrollado principalmente en Alemania, mientras que el segundo se ha desarrollado en Japón.
En la presente tesis se ha desarrollado el sistema del tipo atractivo que es inherentemente inestable y que requiere de acción de control a fin de suspender una masa (esfera) en el aire a cierta distancia de un electroimán (solenoide).
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Ali, Raza. "Defect detection using eddy-currents and Hall effect sensor arrays." [Ames, Iowa : Iowa State University], 2007.
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Kawato, Yusuke. "Multi-DOF precision positioning methodology using two-axis Hall-effect sensors." Texas A&M University, 2003. http://hdl.handle.net/1969.1/3845.
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A novel sensing methodology using two-axis Hall-effect sensors is proposed, where
the absolute positioning of a device atop any magnet matrix is possible. This methodology
has the capability of micrometer-order positioning resolution as well as unrestricted translational
and rotational range in planar 3-DOF (degree-of-freedom) motions, with potential
capability of measuring all 6-DOF motions. This research presents the methodology and
preliminary experimental results of 3-DOF planar motion measurements atop a Halbach
magnet matrix using two sets of two-axis Hall-effect sensors. Analysis of the Halbach
magnet matrix is presented to understand the generated magnetic field. The algorithm
uses the Gaussian least squares differential correction (GLSDC) algorithm to estimate the
relative position and orientation from the Hall-effect sensor measurements. A recursive
discrete-time Kalman filter (DKF) is used in combination with the GLSDC to obtain optimal
estimates of position and orientation, as well as additional estimates of velocity and
angular velocity, which we can use to design a multivariable controller.
The sensor and its algorithm is implemented to a magnetic levitation (maglev) stage
positioned atop a Halbach magnet matrix. Preliminary experimental results show its position
resolution capability of less than 10 µm and capable of sensing large rotations. Controllers
were designed to close the control loop for the three planar degrees of freedom
motion using the GLSDC outputs at a sampling frequency of 800 Hz on a Pentek 4284 digital
signal processor (DSP). Calibration was done by comparing the laser interferometers and the GLSDCÂs outputs to improve the positioning accuracy.
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Tian, Peng. "Graphene-based high spatial resolution hall sensors with potential application for data storage media characterisation." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/graphenebased-high-spatial-resolution-hall-sensors-with-potential-application-for-data-storage-media-characterisation(0bb9f59f-a9e2-42e8-ac1f-0adc93e9ae01).html.
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This thesis reports on two graphene-based structures that have been proposed and fabricated as possible prototypes for high-spatial-resolution Hall sensors with potential application in research on high-density magnetic recording technology such as bit patterned magnetic recording (BPMR) and other areas where the measurement of highly inhomogeneous fields is required. There is a direct graphene-metal contact in the first structure, which is named as TYPE I in this thesis, so that the anomalous Hall effect (AHE) in the ferromagnetic islands deposited on the graphene could be detected. Meanwhile, the graphene and the metal are isolated by an h-BN layer in the second structure which is named as TYPE II, so that only the stray field from the islands can be detected using the ordinary Hall effect (OHE).The transport measurements performed on TYPE I devices revealed there is no AHE or stray field signal detectable, and their Hall resistance relations are non-linear and do not pass through the origin point. A finite element simulation comparing the resistance of the empty graphene cross and the island-occupied cross indicates that the current in the graphene may not redistribute through the metallic islands due to interface current blocking, resulting in the non-appearance of the expected AHE signal. Moreover, an analysis on the data of the longitudinal magnetoresistance (MR) reveals that a two-fluid model and effective medium theory (EMT) model might be the major graphene MR mechanisms in the regime away from and near to the charge neutrality point (CNP) respectively. As a combined result of the above findings, a joint MR-Hall effect model under the condition of the presence of a pre-existing transverse offset current, is proposed to explain the unusual behaviour of the Hall measurement data of the TYPE I devices. The model gives qualitatively correct fitting for all longitudinal and transverse transport data of TYPE I devices. In addition, the nature of the graphene/metal contact is considered as the reason responsible for the non-appearance of the expected AHE and stray field signal, although further experimental work is needed, and suggested in the thesis, to clarify this issue. On the other hand, the TYPE II devices have shown their potential to be developed as a Hall sensor being able to detect a sub-micron magnetic island in the future, but there is still a large space for the performance of the devices to be improved. At the end of the thesis, future experimental work, which could lead to the eventual development of a high-sensitivity high-spatial-resolution Hall sensor on the basis of TYPE I and TYPE II structures, are suggested and described.
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Locke, Joshua R. "CMOS Compatible 3-Axis Magnetic Field Sensor using Hall Effect Sensing." Thesis, Rochester Institute of Technology, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10003075.
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The purpose of this study is to design, fabricate and test a CMOS compatible 3-axis Hall effect sensor capable of detecting the earth’s magnetic field, with strength’s of ∼50 μT. Preliminary testing of N-well Van Der Pauw structures using strong neodymium magnets showed proof of concept for hall voltage sensing, however, poor geometry of the structures led to a high offset voltage. A 1-axis Hall effect sensor was designed, fabricated and tested with a sensitivity of 1.12x10-3 mV/Gauss using the RIT metal gate PMOS process. Poor geometry and insufficient design produced an offset voltage of 0.1238 volts in the 1-axis design; prevented sensing of the earth’s magnetic field. The new design features improved geometry for sensing application, improved sensitivity and use the RIT sub-CMOS process. The completed 2-axis device showed an average sensitivity to large magnetic fields of 0.0258 μV/Gauss at 10 mA supply current.
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Mellet, Dieter Sydney-Charles. "An integrated continuous output linear power sensor using Hall effect vector multiplication." Diss., Pretoria : [s.n.], 2002. http://upetd.up.ac.za/thesis/available/etd-09012005-120807.
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Antunes, Pedro Ivo Teixeira de Carvalho. "Medição de posição de rotor em mancal magnético através de sensor Hall." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3152/tde-10062013-152331/.
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A Escola Politécnica da Universidade de São Paulo (EPUSP, Brasil) e o Instituto Dante Pazzanese de Cardiologia (IDPC, Brasil) estão desenvolvendo conjuntamente um Dispositivo de Assistência Ventricular (DAV) baseado numa bomba de vazão mista e utilizando mancais magnéticos que objetivem substituir os mancais convencionais, pois o uso de mancal magnético neste dispositivo minimiza a hemólise e melhora o tempo de vida do DAV, isso em razão da ausência e contato de um mancal com a crase sanguínea o que, por fim, aumenta a vida útil do dispositivo. O mancal magnético utilizado para o DAV será o mancal do tipo híbrido. Este tipo de mancal combina ímãs permanentes com eletroímãs para realizar a levitação do rotor com controle apenas na direção axial do rotor. Na configuração original desse mancal magnético, um sensor indutivo detecta a posição axial do rotor. Esta posição é enviada a um controlador do tipo PID e processada, amplificada e enviada aos atuadores eletromagnéticos. A corrente enviada aos eletroímãs é controlada de maneira a manter o rotor sempre em uma posição axial fixa. No entanto, essa configuração exige o uso de um atuador eletromagnético contendo um furo para a instalação do sensor indutivo, impondo limitações no desempenho do atuador. Além disso, o sensor indutivo limita a miniaturização do mancal. Assim, para minimizar as limitações impostas pelo uso do sensor indutivo, este trabalho faz, primeiramente, um levantamento das diversas técnicas conhecidas para a medição da posição do rotor em mancais magnéticos. Como resultado, este trabalho identifica o uso do sensor Hall como a alternativa mais promissora. Este sensor responde à magnitude de um campo magnético que nele é aplicado. Fixando-se um ímã permanente ao rotor, obtém-se uma saída no sensor Hall proporcional ao deslocamento do rotor. Contudo, a leitura do sensor Hall é afetada ainda pelo campo magnético gerado pelos atuadores eletromagnéticos, o que é indesejável. Buscando minimizar essa influência, este trabalho apresenta algumas estratégias para eliminar, da saída do sensor Hall, a influência do campo gerado pelo atuador eletromagnético. Os métodos são testados através de experimentos de levitação em mancal magnético e a eficácia dos mesmos comprovada.The Escola Politécnica of the University of São Paulo (EPUSP, Brazil) and the Institute Dante Pazzanese of Cardiology (IDPC, Brazil) are jointly developing a Ventricular Assist Device (VAD) based on a mixed flow pump with magnetic bearings. The VAD rotor has a conical shape with spiral impellers that impels and pressurizes the blood. The magnetic bearing eliminates mechanical contact between the pump rotor and the VAD body, minimizing hemolysis and improving the lifetime of the VAD. The magnetic bearing studied is the hybrid type that combines permanent magnets with electromagnets to execute active control in the axial direction of the rotor. In the original configuration, the bearing uses inductive sensor to detect the axial position of the rotor. The sensor readings are sent to a PID type controller, processed, amplified and sent to the electromagnets. The current supplied to the electromagnets are controlled in a manner to keep the rotor in a fixed axial position. However, this configuration requires the use of a hollowed core in the electromagnetic actuator, imposing limitations in its efficiency. Moreover, the use of an inductive sensor imposes limitations to pump downsizing. In order to minimize the limitations, this work conducts firstly a study about alternative techniques for measuring the rotor position in a magnetic bearing. As result, the Hall sensor is identified as the most promising alternative. The Hall sensor is a small semiconductor element available in the market that gives an electric signal with amplitude corresponding to the magnet field intensity applied to it. By fixing a permanent magnet to the rotor, the Hall sensor gives a signal according to the rotor displacement. However, the Hall sensor output is also affected by the magnetic field generated by the electromagnetic actuator of the bearing. This is not desirable for controlling the bearing. In order to minimize the mentioned influence, this work presents some methods to eliminate the influence of the actuator from the Hall sensor readings. The methods are tests in a magnetic bearing and the efficiency of these methods is demonstrated.
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Sadeghi, Mohammadreza. "Highly sensitive nano Tesla quantum well Hall Effect integrated circuits using GaAs-InGaAs-AlGaAs 2DEG." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/highly-sensitive-nano-tesla-quantum-well-hall-effect-integrated-circuits-using-gaasingaasalgaas-2deg(cec2fce1-7cf5-4d36-918d-873e0d38cac0).html.
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Hall Effect integrated circuits are used in a wide range of applications to measure the strength and/or direction of magnetic fields. These sensors play an increasingly significant role in the fields of automation, medical treatment and detection thanks largely to the enormous development of information technologies and electronic industries. Commercial Hall Effect ICs available in the market are all based on silicon technology. These ICs have the advantages of low cost and compatibility with CMOS technology, but suffer from poor sensitivity and detectability, high power consumption and low operating frequency bandwidths. The objective of this work was to develop and fabricate the first fully monolithic GaAs-InGaAs-AlGaAs 2-Dimensional Electron Gas (2DEG) Hall Effect integrated circuits whose performance enhances pre-existing technologies. To fulfil this objective, initially 2 µm gate length pHEMTs and 60/20 µm (L/W) Greek cross Hall Effect sensors were fabricated on optimised GaAs-In.18Ga.82As-Al.35Ga.65As 2DEG structures (XMBE303) suitable for both sensor and integrated circuit designs. The pseudomorphic high electron mobility transistors (pHEMTs) produced state-of-the-art output conductance, providing high intrinsic gain of 405, current cut-off frequency of 4.8 GHz and a low negative threshold voltage of -0.4 V which assisted in designing single supply ICs with high sensitivity and wide dynamic range. These pHEMTs were then accurately modelled for use in the design and simulation of integrated circuits. The corresponding Hall sensor showed a current sensitivity of 0.4 mV/mA.mT and a maximum magnetic DC offset of 0.35 mT at 1 V. DC digital (unipolar) and DC linear Hall Effect integrated circuits were then designed, simulated, fabricated and fully characterised. The DC linear Hall Effect IC provided an overall sensitivity of 8 mV/mT and a power consumption as low as 6.35 mW which, in comparison with commercial Si DC linear Hall ICs, is at least a factor of 2 more power efficient. The DC digital (unipolar) Hall Effect IC demonstrated a switching sensitivity of 6 mT which was at least ~50% more sensitive compared to existing commercial unipolar Si Hall ICs. In addition, a novel low-power GaAs-InGaAs-AlGaAs 2DEG AC linear Hall Effect integrated circuit with unprecedented sensitivity and wide dynamic range was designed, simulated, fabricated and characterised. This IC provided a sensitivity of 533 nV/nT, minimum field detectability of 177 nT (in a 10 Hz bandwidth) at frequencies from 500 Hz up to 200 kHz, consuming only 10.4 mW of power from a single 5 V of supply. In comparison to commercial Si linear Hall ICs, this IC provides an order of magnitude larger sensitivity, a factor of 4 higher detectability, 20 times wider bandwidth and over 20% lower power consumption (10.4 mW vs. 12.5 mW). These represent the first reported monolithic integrated circuits using a CMOS-like technology but in GaAs 2DEG technology and are extremely promising as complements, if not alternatives, to CMOS Si devices in high performance applications (such as high temperatures operations (>150 °C) and radiation hardened environment in the nuclear industry).
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Alaeinovin, Pooya. "Analysis and improvement of low precision Hall-sensor-controlled brushless dc motors." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/24224.
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Hall-sensor-based Brushless dc (BLDC) motors are becoming very popular in wide range of applications, mainly due to their low cost, high efficiency, and reliable operation as compared to the conventional brushed motors. These machines have been extensively researched in the literature mainly under two common assumptions: each Hall-sensor produce square-wave signal of exactly 180 electrical degrees; and that the signals from the three Hall-sensors are exactly 120 electrical degrees apart. These assumptions are not necessarily the case, particularly for low to medium cost motors.
A recently published manuscript investigated operation of motors with unbalanced Hall-sensor signals and introduced inaccurate positioning of the sensors as the cause of the unbalance. There, solutions have been proposed to mitigate the adverse effects of sensor positioning errors on performance of the motor. This thesis builds upon this recent publication by identifying another source of error in the Hall-sensor signals. Here, it is shown that inaccurate positioning of the Hall sensors and uneven magnetization of the tablet with which the Hall sensors react are the major factors contributing to the distortion of Hall sensor signals. It is shown here that errors in the Hall sensor signals result in unsymmetrical operation of the inverter which in turn leads to low-frequency harmonics in the electromagnetic torque; increases torque ripple and acoustic noise; and degrade overall dynamic performance of the drive. A control-level approach is proposed to mitigate the adverse effects of the errors in the Hall-sensor signals. In this approach a multi-stage digital filtering block is added to remove the errors in the original Hall-sensor signals. Each stage of the filter is designed to cancel the undesirable harmonics due to one of the error sources, the unevenly magnetized reaction tablet and the misaligned Hall sensors. An efficient realization of the proposed filter is presented that makes it possible to be potentially programmed inside existing motor controllers or implemented in a stand-alone microcontroller which can be packaged into a dongle circuit. The operation of typical low-precision industrial BLDC motors with the proposed filtering approach is shown to approach the performance of the motors with ideal Hall sensors.
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Zhang, Jianbo. "Readout Circuits for a Z-axis Hall Sensor with Sensitivity Drift Calibration." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-175785.
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Hall effect magnetic sensors have gradually gained dominance in the market of magnetic sensors during the past decades. The compatibility of Hall sensors with conventional CMOS technologies makes monolithic Hall sensor microsystem possible and economic. An attractive application is the contactless current sensor by using Hall sensors to measure the magnetic field generated by the electrical current. However, Hall sensors exhibit several non-idealities, i.e., offset, noise and sensitivity drift, which limit their precision. Therefore, effective techniques to reduce these imperfections are desired. This thesis presents the design of a new readout scheme for Hall magnetic sensor with low offset, low noise and low sensitivity drift. The Hall sensor is realized in N-well as Hall plate and modeled in Verilog-A for the purpose of co-simulation with interface circuits. The self-calibrated system is composed of two identical Hall plates, preamplifiers and a first-order ΣΔ modulator, which can be fully integrated monolithically. Four-phase spinning current technique and chopper stabilization technique have been employed to reduce the offset and 1/fnoise of Hall platesand OTA, respectively. Integrated coils are used to generate the reference magnetic field for calibration. The preamplifiers amplify the signal and separate the Hall voltage and reference voltage. The ΣΔ modulator reduces the thermal drift by using Hall voltage as the modulator input and reference voltage as the DAC output. This new calibration technique also compensates the thermal drifts of the biasing current and readout circuits. The overall system is implemented in NXP140nm CMOS process with 1.8V supply. The Virtuoso/Spectre simulation results show residual drifts lower than 10ppm/ ̊C, which are 3-5 times lower than the state of the art. The input magnetic field and temperature range are ±100mT and -40 ̊C to 120 ̊C, respectively.
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Santos, Paulo Roberto dos. "Desenvolvimento de um sistema sensorial utilizando sensor hall para detecção de nanopartículas magnéticas." reponame:Repositório Institucional da UnB, 2015. http://dx.doi.org/10.26512/2015.12.D.20115.
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Dissertação (mestrado)—Universidade de Brasília, Instituto de Biologia, Pós-graduação em Nanociência e Nanobiotecnologia, 2015.Submitted by Fernanda Percia França (fernandafranca@bce.unb.br) on 2016-04-27T18:16:20Z No. of bitstreams: 1 2015_PauloRobertodosSantos.pdf: 3035381 bytes, checksum: b61c480db51b39b4ede83c3ae01411fe (MD5)
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Testes com ensaio imunológico tornaram-se uma importante ferramenta para diagnóstico clínico e em desenvolvimento de pesquisa. É cada vez mais crescente a aplicação de nanopartículas magnéticas em ensaios imunológicos afim de separar e quantificar antígenos. Normalmente o diâmetro da nanopartícula em conjunto com a cobertura é de algumas dezenas de nanômetros até alguns micrômetros. Na medicina, essas nanopartículas podem ser usadas tanto “in vivo” (partículas introduzidas no corpo do paciente) como “in vitro” (ensaios imunológicos e outros tipos de manipulação). No caso do uso “in vivo” existe a limitação do tamanho que é de até da ordem de poucas centenas de nanômetros. Nesta dissertação propomos um protótipo para o estudo e desenvolvimento de um sistema de baixo custo para detecção de nanopartículas magnéticas em meio líquido utilizando sensores magnéticos disponíveis no mercado.
Tests with immunoassay become an important tool in clinical diagnostics and in research development. It is ever increasing application of magnetic nanoparticles in immunological assays in order to separate and quantify antigens. Typically the diameter of the nanoparticle together with the cover is a few tens of nanometers to a few micrometers . In medicine, these nanoparticles can be used both " in vivo " ( particles introduced into the patient's body) and "in vitro " ( immunoassays and other manipulation) . In the case of use " in vivo " There is a size limitation which is up to the order of a few hundred nanometers. In this work we propose a prototype for the study and development of a low cost system for detection of magnetic nanoparticles in liquid media using magnetic sensors available on the market.
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Štindl, Daniel. "Měření proudu Hallovými senzory." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242016.
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This master's thesis deals with integrated Hall-effect current sensors. The thesis contains summary of manufacturers of current sensors suitable for low current measurement and comparison of their important parameters. Next objective of the thesis is a design of test board used for evaluation of temperature depedent accuracy of several sensors simultaneously. The device can be connected with PC through USB interface for saving measured values or automated control with other instruments.
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Frough, Bahman Jahan. "Positionsbestämning av en roterande axel i en vinkelgivare." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-222374.
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This thesis includes a study of a touch-free sensor systems and different principles for measuring a magnetic field. An in-depth study was conducted to describe two important principles in these contexts, i.e. Magnetoresistance principle and the Hall Effect principle. A market evaluation of different sensor chips developed on these principles was conducted. Furthermore, the study should be linked to existing principles to determine the position of a rotating axis. Function tests show that the performance requirement for each component was met. The results based on verification tests show that it is important to have a better mechanical connection between drive and device. Temperature tests show that the system meets the project specification at room temperature, but large angular deviations occur in temperature change, especially when driving with short steps. This thesis can be continued by reprogramming the source code and developing new software that can control more parameters and make it more accurate at positioning. Another recommendation would be to investigate and compare other sensor chips because there are several sensors that can apply to the system. Further improvements can be made by performing more tests on the system.Examensarbetet innefattar en studie om beröringsfritt givarsystem och olika principer för att mäta ett magnetfält. En fördjupad litteraturstudie utfördes för att förklara två viktiga principer i dessa sammanhang d.v.s. magnetoresistiva principen och hallgivarprincipen. En marknadsutvärdering av olika sensor-chip som utvecklats enligt dessa principer genomfördes. Vidare ska studien kopplas till kända principer för att bestämma positionen för en roterande axel. Funktionstester visar att prestandakravet för varje komponent uppfylldes. Resultaten baserade på verifieringstester visar att det är viktigt att ha en bättre mekanisk koppling mellan drivdon och enhet. Temperaturtester visar att systemet uppfyller projektets kravspecifikation vid rumstemperaturen men det uppkommer stora vinkelavvikelser vid temperaturförändring framför allt vid körning med korta steg. Detta arbete kan fortsättas genom omprogrammering av källkoden och utveckling av ny programvara som kan styra fler parametrar och göra det mer exakt vid positionsbestämning. En annan rekommendation skulle vara att undersöka och jämföra andra sensorchip eftersom det finns flera sensorer som kan tillämpa i systemet. Ytterligare förbättringar kan göras genom att utföra fler tester på systemet.
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Kumar, Abhinav. "SensAnalysis: A Big Data Platform for Vibration-Sensor Data Analysis." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/101529.
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The Goodwin Hall building on the Virginia Tech campus is the most instrumented building for vibration monitoring. It houses 225 hard-wired accelerometers which record vibrations arising due to internal as well as external activities. The recorded vibration data can be used to develop real-time applications for monitoring the health of the building or detecting human activity in the building. However, the lack of infrastructure to handle the massive scale of the data, and the steep learning curve of the tools required to store and process the data, are major deterrents for the researchers to perform their experiments. Additionally, researchers want to explore the data to determine the type of experiments they can perform. This work tries to solve these problems by providing a system to store and process the data using existing big data technologies. The system simplifies the process of big data analysis by supporting code re-usability and multiple programming languages. The effectiveness of the system was demonstrated by four case studies. Additionally, three visualizations were developed to help researchers in the initial data exploration.Master of Science
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Forsberg, Oscar. "Evaluation of Hall-sensors for motor control in high precision applications for aircraft." Thesis, Uppsala universitet, Elektricitetslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-296966.
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A functioning prototype test motor with Hall-sensor feedback has been built, and the test results show that the motor performance in terms of speed ripple is well within the specified demands. The temperature demands however, have not been fully met. The minimum operating temperature of the sensor was specified to -55◦C by Saab, and the sensors found on the market has a minimum operating temperature of -40◦C. There was also an operation error, the reason of which could either be failure of the drive unit to deliver enough current, or the stator magnetic field strength being too strong for the sensors to reliably detect the rotor magnets when a sufficiently strong current is run through the stator windings. For the purpose of investigating this error it is proposed to conduct tests with a drive unit that can deliver currents over 5 A.SWE Demo
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Chen, Ann Annie. "Tactile sensor design optimization for footwear applications from piezoresistive elastomer to Hall-effect integrated sensing methods." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119964.
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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2018.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 51-54).
Our ability to move across various terrains depends heavily on the mechanical interactions between our feet and the external environment. Understanding how to best replicate mechanoreceptors in feet can lead to major improvements in plantar sensing for athletic performance analysis and medical devices. However, current plantar sensing technologies are unable to meet the associated demands for accuracy, sensitivity, and durability. In addition, current sensors are also unable to withstand the large impact forces and inertial noise associated with human locomotion. To address this issue, this thesis investigates alternative designs for a tactile force sensors that are largely inspired by mechanoreceptors found in human skin. Two different sensing methodologies will be analyzed: piezoresistive elastomer and Hall-effect integration. The piezoresistive elastomer method will involve testing mixtures of urethane or silicone rubbers with various conductive substances such as carbon black. Compressing the sensors at various forces will correspond to lower resistance measurements as more electrical connections are made by the conductive particulates. Though these designs have high sensitivity to changes in force, the resulting data is inconsistent and slow to stabilize due to material creep. The Hall-effect integrated method will involve a magnet and four Hall-effect sensors molded in an elastomer matrix. Compressing the sensors will register different readings in each of the four embedded Hall-effect sensors which will correspond to a certain shear and deflection measurement. This sensor design shows promise as a cost-effective plantar sensor, but additional analysis is needed.
by Ann (Annie) Chen.
S.B.
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Bales, Dustin Bennett. "Characteristic Classification of Walkers via Underfloor Accelerometer Gait Measurements through Machine Learning." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/81183.
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The ability to classify occupants in a building has far-reaching applications in security, monitoring human health, and managing energy resources effectively. In this work, gender and weight of walkers are classified via machine learning or pattern recognition techniques. Accelerometers mounted beneath the floor of Virginia Tech's Goodwin Hall measured walkers' gait. These acceleration measurements serve as the inputs to machine learning techniques allowing for classification. For this work, the gait of fifteen individual walkers was recorded via fourteen accelerometers as they, alone, walked down the instrumented hallway, in multiple trials. These machine learning algorithms produce an 88 % accurate model for gender classification. The machine learning algorithms included are Bagged Decision Trees, Boosted Decision Trees, Support Vector Machines (SVMs), and Neural Networks. Data reduction techniques achieve a higher gender classification accuracy of 93 % and classify weight with 64% accuracy. The data reduction techniques are Discrete Empirical Interpolation Method (DEIM), Q-DEIM, and Projection Coefficients. A two-part methodology is proposed to implement the approach completed in this thesis work. The first step validates the algorithm design choices, i.e. using bagged or boosted decision trees for classification. The second step reduces the walking data measured to truncate accelerometers which do not aid in increasing characteristic classification.Master of Science
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Kankanam, Gamage Sisira. "Exploration of Novel Silicon Devices Toward the Realization of a MEMS-Based Microsystem for Utilities (Water, Gas, Electrical) Monitoring." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin985901586.
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Gougani, Milad. "Hall sensor-based locking electric differential system for BLDC motor driven electric vehicle with independent wheel drives." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/42168.
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It is generally known that stability of vehicles under certain driving conditions may be improved by forcing the wheels to turn at the same speed and angle regardless of the available traction under individual wheels. For conventional all-terrain vehicles or sport-utility vehicles, this function can be achieved by locking the mechanical differential system. In this thesis, we propose an innovative approach for locking the electrical differential system (EDS) of electric vehicles (EV) with independent brushless DC (BLDC) machine-based wheel drives. The proposed method locks the active wheels of the vehicle as if they were operating on a common “virtual” shaft. The locking algorithm is implemented by processing the Hall sensor signals of the considered motors and driving them with a single set of “averaged” Hall signals, thereby operating the motors at the same speed and angle. A detailed switch-level model of EDS embedded with the proposed Sync-Lock Control (SLC) along with the BLDC propulsion motors has been developed and compared against measurements for the considered BLDC propulsion motors. The proposed technique is shown to achieve better results compared to a conventional speed control loop as the considered motors are locked directly through the corresponding magnetic fields.
An efficient realization of the proposed controller is presented that makes it possible to be potentially programmed inside existing motor controllers or implemented in a stand-alone microcontroller which can be packaged into a dongle circuit. The proposed SLC is implemented digitally using a programmable integrated circuit microcontroller. First, the Hall signals undergo a layer of filtering to mitigate the errors that are common due to Hall sensor misalignment in low-cost BLDC motors. Then, the locking algorithm is implemented by averaging the filtered Hall sensor signals. The SLC prototype is implemented in form of a standalone dongle-circuit that can be easily placed between the original Hall-sensors and the BLDC motor driver. Operation of typical industrial BLDC motors with the proposed controller is shown to outperform conventional controllers and lock both speed and angle of the motors.
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Rivest, Christopher W. (Christopher Warren). "Design and characterization of a low cost dual differential proving ring force sensor utilizing Hall-effect sensors." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36709.
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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2006.Includes bibliographical references (leaf 31).
A novel dual differential hall-effect based proving ring force sensor has been designed, manufactured, and tested. Strain gauge based force sensors are among the most common methods of measuring static and dynamic forces, yet they suffer from a wide array of negative attributes including: high cost due to signal amplification instrumentation, high temperature sensitivity, and only moderate dynamic range. The goal of the research herein described was to design and test a low cost, high dynamic range force sensor. Hall-Effect sensors have high bandwidth (>100 kHz), a wide dynamic range, are low in cost (<0.5$), and are ideally suited to dynamic and static force measurements. Proving rings - diametrally loaded hoops of metal, have long been used to measure force yet suffer many setbacks due to their historical designs utilizing mechanical and strain gauge methods of strain detection. A novel nested proving ring flexure has been combined with hall-effect sensors to fulfill the design requirements of a low cost and robust force sensor. Initial data demonstrates that the nested proving ring force sensor herein described is capable of resolving forces of in the range of 0 to 30 Newtons with an accuracy of 0.235 Newtons, all at a potential mass-manufactured cost of U.S. $10.00 per unit.
by Christopher W. Rivest.
S.B.
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Malmström, Tore, and Carl Göransson. "Lightweight elevator : A portable elevator capable of climbing rooftops." Thesis, KTH, Mekatronik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-295794.
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The purpose of this project is to design and construct a portable lightweight elevator for transportation of goods to rooftops. The elevator should be easy to transport, assemble and disassemble, it should also be useful at various heights and for a wide range of roof inclinations. The elevator contains a railway consisting of four separable modules. A carriage rides the railway and is pulled to the top with a winch powered by a DC-motor. The carriage starts and stops using a Rocker switch and a Hall sensor that detects magnets placed at the end and beginning of the railway. After performing tests with the elevator the conclusion is that the elevator is practical to assemble and transport, but the carriage derails too easily when the railway has angular changes.Målet med projektet är att designa och konstruera en portabellättviktshiss som kan transportera gods från marknivå till hustak. Den ska vara lätt att transportera och att montera ner och upp, den ska också gå att anvåanda för olika höjder och på hus med olika taklutningar. Hissen består av en räls som går att ta isär i fyra olika delar. En vagn åker på fyra hjul uppför rälsen och lyftkraften kommerfrån en vinsch som drivs av en likströmsmotor. Vagnen kan starta och stanna med hjälp av en knapp, den stannar även automatisk då en hallsensor på vagnen känner av magneter som är placerade vid början och slutet av rälsen. En arduino Uno skickar signaler mellan de elektriska komponenterna och motorn får ström via en H-brygga, vilket gör att den kan rotera i båda riktningarna. Efter att hissen testats kan det konstateras att konstruktionen är enkel att bygga ihop och smidig att fästa vid olikavinklar och höjder. Däremot spårar vagnen ofta ur då hissen körs med för branta vinklar mellan de olika delarna av rälsen.
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Fialho, Walter Macêdo Lins. "Ensaio não destrutivo baseado em medidas de campo magnético para acompanhamento da formação da fase sigma em um aço inoxidável duplex." Universidade Federal da Paraíba, 2015. http://tede.biblioteca.ufpb.br:8080/handle/tede/8960.
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Duplex stainless steels (AID) are characterized for having good mechanical strength and corrosion. However, when subjected to manufacturing processes requiring the material thermal cycles with temperatures above 600 ° C, occurs emergence of fragile phases that compromise his toughness and corrosion resistance. Among these phases there is the presence of σ phase, rich in chromium and high hardness. In this paper we sought to develop a monitoring technique of the formation of σ phase. This technique is based on the study of the interaction between microstructure of the duplex stainless steel and the magnetic field applied to the material. Specimen with different amounts of σ phase were obtained by aging at temperatures of 800 °C and 900 °C. Aged AID was characterized by optical microscopy and scanning electron, hardness tests, impact tests and X-ray diffraction. The volumetric percentage of this phase was estimated by X-ray diffraction and processing of optical microscopy images. The magnetic field measurements were performed with a Hall effect sensor. The results show that the rise of the phase reduced the σ value of the magnetic permeability of the material, indicating that the magnetic properties and permeability measurements, as well as the resultant magnetic field, can be used for monitoring formation of this phase. The study proves to be developed effective technique for monitoring the duplex stainless steel embrittlement.
Os aços inoxidáveis duplex (AID) se caracterizam por apresentarem boa resistência mecânica e à corrosão. Contudo, quando submetidos a processos de fabricação que impõe ao material ciclos térmicos com temperaturas acima de 600 oC, ocorre surgimento de fases fragilizantes que comprometem a sua tenacidade e resistência à corrosão. Entre essas fases destaca-se a presença da fase σ, rica em cromo e de elevada dureza. Neste trabalho buscou-se desenvolver uma técnica de acompanhamento da formação da fase σ. Essa técnica se baseou no estudo da interação entre microestrutura do aço inoxidável duplex e ao campo magnético aplicado ao material. Amostras com diferentes quantidades de fase σ foram obtidas pelo envelhecimento nas temperaturas de 800ºC e 900ºC. O AID envelhecido foi caracterizado por microscopia ótica e eletrônica de varredura, ensaios de dureza, testes de impacto e difração de raios X. O percentual volumétrico dessa fase foi estimado por difração de raios X e processamento de imagens de microscopia óptica. As medidas de campo magnético foram realizadas com um sensor de efeito Hall. Os resultados mostram que o surgimento da fase σ reduziu o valor da permeabilidade magnética do material, indicando que as propriedades magnéticas e que medidas de permeabilidade, bem como do campo magnético resultante, podem ser utilizadas para acompanhamento de formação dessa fase. O estudo comprova ser a técnica desenvolvida eficaz para monitoramento da fragilização de aço inox duplex.
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Tappe, Peter, Jürgen Heinzmann, and Ralf Raupold. "On/Off solenoid with sensorless position detection." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71254.
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As is generally known, pressure-resistant solenoids for valves are used in hydraulics and pneumatics. These solenoids, for example, consist of a so-called pole tube with an integrated armature and a separate solenoid coil. Suitable displacement measuring systems are used in order to measure the armature´s as well as valve spool´s position constnatly; these ar directly mounted to the solenoid. Exeamples here are Hall Effect sensors or LVDT transducers. In case of lesser requirements, it is also possible to measure the valve spool´s position directly and in simplified manner. Here, partially standard proximity sensors are employed, which use the valve spool directly as measuring object. In these cases, however, only discrete position measurement is possible. A constant displacement measurement is not necessary. By means of the sensorless position-control developed by MSM, the armature´s position can be executed directly by analyzing the solenoid coil, partly replacing the usual sensors, under adapted basic conditions.
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Evestedt, Fredrik, and Anders Karlsson. "Strömkontroll till aktiva magnetlager med noggrann och störningsreducerad strömmätning." Thesis, Uppsala universitet, Elektricitetslära, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-201314.
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There is always a need for more effective ways to store energy in order to reduce the human impact on the environment. One step on the way can be the use of flywheels as kinetic energy storage devices. Low frictional losses are essential for a flywheel to be effective. To minimize these losses active magnetic bearings (AMB) can be used to keep the shaft centered instead of the more conventional ball-bearings. AMBs use actuators and a fast control system that needs correct and noise-free measurement data of the shaft position and the current in the actuators to work properly. This thesis explains the process of constructing power electronics and a current measurement system for active magnetic bearings (AMB). The focus of the thesis is on how to minimize noise in the circuits, including practical considerations on circuit design and theoretical explanations of the origin of noise in electric circuits. In addition there are discussions on factors to consider when designing a PCB and the importance of choosing the right component for the right application. Finished PCB-designs for both power electronics and current measurement along with specifications of the circuits and calibration data is presented. The finished circuits works well and have low noise levels and high reliability.
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Oba, Masatoshi. "STUDIES ON THE FABRICATION OF VERTICAL INTEGRATED MEMS DEVICES." 京都大学 (Kyoto University), 2010. http://hdl.handle.net/2433/126817.
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Schell, Jean-Baptiste. "Microsystème de positionnement dédié à l'instrumentation d'aiguilles pour intervention chirurgicale sous scanner IRM." Thesis, Strasbourg, 2013. http://www.theses.fr/2013STRAD043.
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Les interventions chirurgicales s'orientent de plus en plus vers des techniques dites mini-invasives. Dans ce mode d'intervention, le praticien perd la vision directe de l'extrémité de l'instrument médical qu'il manipule. Le contrôle visuel du déplacement de l'instrument à l'intérieur du corps humain s'effectue alors sur écran grâce aux techniques d'imagerie médicale, en particulier l'imagerie par résonance magnétique (IRM). Afin d'assurer une grande précision du déplacement de l'instrument, sa position doit être connue pour permettre un recalage automatique du plan d'imagerie en temps réel. Ce document décrit la conception et la caractérisation d'un système de positionnement fonctionnant sous IRM et pouvant s'insérer dans un instrument médical de très petit diamètre. Afin d'aboutir à des dimensions millimétriques, le système est réalisé sur une puce en silicium utilisant les procédés standard de fabrication de la micro-électronique : la technologie CMOS 0,35 µm basse tension. Ce microsystème est basé sur l'utilisation d'un capteur magnétique 3D à effet Hall associé à l'électronique intégrée spécifique au traitement du signal, permettant d'extraire la mesure précise des gradients de champ magnétique inhérents au principe même de l'IRM. La relation unique entre les coordonnées spatiales du tunnel du scanner IRM et les gradients de champ magnétique, rend possible la détermination de la position et de l'orientation du microsystème. Les résultats expérimentaux montrent qu'une localisation est possible en 3 ms avec une résolution spatiale sub-millimétriqueSurgeries are moving more and more towards so called minimally invasive techniques. With these techniques, the surgeon looses direct view of the medical tool that he manipulates. The visual control of the instrument movement inside the human body is monitored on a screen through medical imaging techniques, particularly magnetic resonance imaging (MRI). To ensure a high accuracy of the instrument movement, its position must be known to enable the automatic registration of the imaging plane in real time.This work describes the design and characterization of a positioning system operating in a MRI scanner which can be embedded in medical devices of very small diameters. To achieve millimeter dimensions, the system is realized on a silicon chip using standard manufacturing processes of microelectronics : low voltage 0.35 µm CMOS technology. This microsystem is based on the use of a 3D magnetic Hall effect sensor co-integrated with specific signal processing electronics to extract the accurately measured magnetic field gradients which are inherent to the MRI principle. The unique relationship between scanner bore space coordinates and the magnetic field gradients allows to determine the position and orientation of the microsystem. Experimental results show that localization is possible in 3 ms with sub-millimeter spatial resolution
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Liang, Chen-Wei. "A high spatial resolution magnetovision camera using high-sensitivity Quantum Well Hall Effect sensors." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/a-high-spatial-resolution-magnetovision-camera-using-highsensitivity-quantum-well-hall-effect-sensors(fbd23629-b9f8-4f1d-9bc7-1ee08bcf79e8).html.
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A systematic and detailed design, building and testing of a high-sensitivity real-time magnetovision imaging system for non-destructive testing (NDT) was the purpose of the research presented here. The magnetic imaging systems developed were all based on an ultra-high sensitivity Quantum Well Hall Effect (QWHE) sensors, denoted as the P2A, which is based on GaAs-InGaAs-AlGaAs 2DEG heterostructures. The research progressed from 0D (single sensor) to 1D (linear array) to 2D (two dimensional arrays) testing modalities. Firstly, the measurement of thermal and shot noises, drift, detection limit, and dynamic offset cancellation of the QWHE sensor were studied in detail to set the framework and limitations of the fundamental QWHE sensors before their eventual use in the imaging systems developed subsequently. The results indicate that the measured data agrees well with calculations for thermal and shot noise when the input bias current is < 3 mA. The measured drift voltages of various QWHE sensors (P2A and P3A) are less than 200 µV when the sensor bias voltage is less than or equal to 2 V. A 4-direction dynamic offset cancellation technique was developed and the results show that the offset equivalent magnetic field of the QWHE sensors can be reduced from ~ 1mT to readings equal to the Earth magnetic field (~ 50 µT). Secondly, a flexible 16 × 1 array and a 32 × 2 staggered array magnetic-field scanners were designed, built, and tested. The QWHE magnetometer had a field strength resolution of 100 nT, and a measurement dynamic range of 138 dB. The flexible 16 × 1 magnetic field scanner can be used to test uneven and/or curved surfaces. This gives the flexible magnetic field scanner better inspection capabilities in both welding hump and circular pipe samples. By the staggered arrangement of two sensor arrays, a 15.4 point per inch horizontal spatial resolution can be achieved for the staggered 32 × 2 magnetic field scanner. Both direct and alternating magnetic flux leakage (DC and AC MFL) tests with the QWHE magnetometer were accomplished to obtain graphical 2-dimensional magnetic field distributions. Both the shape and the location of defects can be identified. The results show that the sensor has high sensitivity and linearity in a wide frequency range which makes it an optimum choice for AC-MFL testing and both ferromagnetic and non-ferromagnetic materials can be investigated. Thirdly, real-time 8 × 8 and 16 16 QWHE array magnetic-field cameras were designed, built, and tested. These prototypes can measure static magnetic field strengths in a 2-dimensional plane. Different shapes of magnets and magnetic field polarities can all be identified by the 8 × 8 magnetic field camera. The camera has a resolution of 3.05 mT, and a dynamic range of 66 dB (the minimum and maximum fields measurable are 3.05 mT and 6.25 mT) and a real time magnetic field measurement rate of 13 frames per second (FPS). By contrast the1616 array magnetic field camera has an improved sampling rate of 600 frame per second and with the use of an interpolation technique, a spatial resolution of 40.6 point per inch can be achieved. The minimum and maximum detectable magnetic field for this magnetic field camera are 1.8 µT and 29.5 mT respectively leading to a record dynamic range of 84 dB for high quality imaging. Finally, a novel, hand held, magnetovision system based on the real-time 16 × 16 QWHE array magnetic-field camera was developed for improved DC and AC electromagnetic NDT testing. The system uses a new super heterodyne technique for data acquisition using the QWHE sensor as a multiplier. This is the first report of such a technique in Hall effect magnetometry. The experimental results of five case studies demonstrate that the defects location and shape can be successfully measured with MFL in DC and AC magnetic field configurations including depth profiling. The major advantages of this real-time magnetic-field camera are: (1) its ease to use as a MFL testing equipment in both DC and AC NDT testing, (2) its ability to provide 2D graphical images similar to Magnetic Particle Inspection (MPI) but without its inherent health and safety drawbacks, (3) its capability to test both ferromagnetic and non-ferromagnetic materials for deep defects below the surface using low frequency alternating magnetic fields, and (4) its ability to identify materials (metals) by alternating external magnetic field illuminations, which has considerable potential in several applications such as security checking and labelling, magnetic markers for analysis, bio-imaging detection, and medical treatments amongst others.
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Dehbaoui, Mourad. "Analyses structurales et contrôle de l'aimantation par sonde de Hall planaire dans des dispositifs nanostructurés." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20128/document.
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Dans un effort de combiner le bénéfice des propriétés magnétiques et électroniques, les semi-Conducteurs magnétiques dilués sont projetés pour être à la base de composants reliant dans leur fonctionnement, à la fois la charge et le spin des électrons. Par l'utilisation d'une technique de magnétométrie à effet Hall, on a fait la caractérisation de ces matériaux par la détermination de l'orientation magnétique à basse température. Nous nous sommes aussi intéressés aux matériaux moléculaires à transition de spin (SCO). La technologie des capteurs magnétiques offre une voie vers la vulgarisation des techniques de détection par l'utilisation de systèmes rapides et sensibles. La détection de la transition de spin des nanoparticules est réalisée par un capteur à effet Hall planaire, fabriqué à base de multicouches magnétiques. Le travail effectué est pionnier dans le domaine de la détection nano magnétique, il ouvre la voie à de nouvelles perspectives dans la recherche fondamentale et dans le développement technologique des capteurs magnétiques. Des améliorations du dispositif ont été réalisées et d'autres sont en stage de développement pour l'amélioration de la sensibilité et la réduction du bruit. L'optimisation devrait fournir un dispositif original de détection de transition de spin des nanoparticules à température ambianteIn an effort to combine the benefits of magnetic and electronic properties, diluted magnetic semiconductors are projected to be the basis for devices combining in their operation, both the charge and spin of electrons. Using Hall Effect magnetometer, a characterization of these materials is done by determining the magnetic orientation at low temperatures. We were also interested in molecular materials spin crossover. The magnetic sensor technology provides a path to the extension of detection techniques through the use of rapid and sensitive systems. The detection of the spin crossover nanoparticles is achieved by a planar Hall Effect sensor, made from magnetic multilayers. The work is a pioneer in the field of nano magnetic detection; it opens up new perspectives in basic research and the technological development of magnetic sensors. Improvements of the device have been completed and others are under development in order to improve sensitivity and reduce noise. The optimization should provide a novel system for detecting spin transition nanoparticles at room temperature
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Cichon, Daniel [Verfasser], Hannes [Akademischer Betreuer] Töpfer, Galdo Giovanni [Gutachter] Del, and Silvia [Gutachter] Krug. "Robuste Lokalisierung magnetischer Quellen mithilfe integrierter 3D-Hall-Sensor-Anordnungen / Daniel Cichon ; Gutachter: Giovanni Del Galdo, Silvia Krug ; Betreuer: Hannes Töpfer." Ilmenau : TU Ilmenau, 2020. http://d-nb.info/1223849643/34.
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West, Jerry. "Orthoplanar Spring Based Compliant Force/Torque Sensor for Robot Force Control." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/6637.
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A compliant force/torque sensor for robot force control has been developed. This thesis presents methods of designing, testing, and implementing the sensor on a robotic system. The sensor uses an orthoplanar spring equipped with Hall-effect sensors to measure one component of force and two moment components. Its unique design allows for simple and cost effective manufacturing, high reliability, and compactness. The device may be used in applications where a robot must control contact forces with its environment, such as in surface cleaning tasks, manipulating doors, and removing threaded fasteners. The compliant design of the sensor improves force control performance and reduces impact forces.
Sensor design considerations are discussed, followed by a discussion of the proposed design concept. Theoretical compliance and stress analysis of the orthoplanar spring is presented that allows for rapid design calculations; these calculations are validated via finite element analysis. A mechanical design method is given which uses the results of the compliance and stress analysis. Transducer design is then addressed by developing a model of the sensor. The design methods are used to design a prototype sensor which is tested to determine its instrument uncertainty. Finally, the sensor is implemented on a robotic platform to test its performance in force control.
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Horigoshi, Francis Massashi. "Uso de sensor efeito Hall para medição da vazão de fluidos no processo de produção de palatabilizantes a base de proteína animal em escala piloto." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/74/74134/tde-28112016-135201/.
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Os medidores de vazão contribuem de forma significante para a otimização industrial onde o deslocamento contínuo de massa é parte integrante do sistema produtivo, sendo, portanto, cruciais para a indústria permitindo assim padronizar produtos e automatizar ações reduzindo a força de trabalho humana e minimizando erros. Este é o caso da produção de palatabilizantes, substâncias produzidas a partir da hidrólise enzimática da proteína animal para conferir aroma e sabor aos alimentos, onde existe um deslocamento continuo de massa com dosagem de fluidos acionadas em várias etapas do processo. Podem-se destacar duas etapas principais: a etapa onde ocorre a dosagem de soluções alcalinas para a hidrólise enzimática e a etapa onde ocorre a acidificação para garantir a segurança microbiológica do produto. No trabalho em questão foi desenvolvido e analisado um medidor de vazão de turbina por sensoriamento via efeito Hall, para determinar a vazão volumétrica de fludos no processo produtivo de palatabilizantes. O sistema utilizado na avaliação do medidor de vazão foi desenvolvido em escala piloto. A calibração do medidor permitiu-se calcular o fator K (coeficiente do medidor) tanto para água, onde o coeficiente foi de 5,5, quanto para palatabilizantes, onde o coeficiente calculado foi de 7. A partir dos dados obtidos pelo medidor de vazão pode-se observar um alto nível de correlação dos dados. O medidor de vazão apresentou-se eficaz para os fluidos testados (água e palatabilizante); e, com uma precisão de ± 2%, mostra-se uma alternativa viável para o processo de produção de palatabilizantes.Flowmeters contribute significantly to the industrial optimization where mass continuous displacement is an integral part of the production system, is therefore crucial for the industry allowing standardize products and automate actions reducing human labor and minimizing errors. This is the case of the production of flavors, substances produced from the enzymatic hydrolysis of animal protein to impart flavor and aroma to food, where there is a continuous mass displacement with fluids dosage triggered in several process steps. They can point out two main steps: a step where dosing occurs alkaline solutions for enzymatic hydrolysis and acidification stage which takes place to ensure the microbiological safety of the product. At work in question was developed and analyzed a turbine flowmeter for sensing via Hall effect to determine the volumetric flow fludos in the production of palatability process. The system used to assess the flow meter was developed on a pilot scale. The meter calibration allowed to calculate the K factor (the ratio meter) for both water where the ratio was 5.5, and for palatability, where the coefficient was calculated 7. From the data obtained by the flowmeter one can observe a high degree of correlation of the data. The flowmeter is made effective for the tested fluids (water and palatability); and with an accuracy of ± 2%, there is shown a viable alternative for the production of flavors process.
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Osberger, Laurent. "Etude de magnétomètres haute performance intégrés en technologie silicium." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAD012.
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La thématique de ce sujet de thèse porte sur l'étude des capteurs de champ magnétique intégrés en technologie CMOS standard basse tension sans étapes de fabrication supplémentaires. La co-intégration du transducteur (l'élément sensible qui transforme le champ magnétique en une grandeur électrique) et de son électronique de conditionnement du signal sur la même puce permet réaliser des fonctions spécifiques qui améliorent significativement les performances du capteur. Les travaux présentés dans cette thèse portent plus particulièrement sur deux types de transducteur : le transducteur à effet Hall dit vertical et un magnéto-transistor particulier appelé « CHOPFET ». Nous avons développé des modèles numériques de ces transducteurs afin d’analyser finement leurs comportement mais aussi d’optimiser leurs performances. En nous basant sur ces résultats, nous avons adapté des techniques de traitement du signal et proposé plusieurs architectures originales dédiées au conditionnement du signal magnétique. Cela a permis d’améliorer significativement les performances de ces capteurs en termes de résolution, d’offset et de consommation électriqueThe subject of thesis subject concerns the study of magnetic field sensors integrated in low-voltage standard CMOS process without additional post-processing steps. Co-integrating the magnetic transducer (the sensitive element transforming the magnetic field into an electrical quantity) together with its conditioning electronics onto a same chip allows to implement specific features, which dramatically improve the sensor performances. This work particularly focuses on two types of transducer: the vertical Hall device and a specific magneto-transistor called “CHOPFET”. We developed numerical simulation models in order to predict and optimize the behavior of these transducers. Based on the results, we adapted dedicated signal processing techniques and proposed several innovative magnetic signal conditioning architectures. This led to significant improvement in terms of resolution, offset and power consumption
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Östling, Johan. "High Accuracy Speed and Angular Position Detection by Dual Sensor." Thesis, Uppsala universitet, Fasta tillståndets fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-365726.
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For many decades there has been a need in many industries to measure speed and position of ferrous gears. This is commonly done by converting passing gear teeth from trigger wheels to electrical impulses to calculate speed and angular position. By using Hall effect sensors or Giant Magnetoresistance sensors (GMR), a zero speed detection of gear teeth is possible while at the same time be cheap to produce and durable for harsh environments. A specially designed trigger-wheel (cogwheel created for measurements) with gear teeth in a specific pattern, exact position can be detected by using a dual sensor, even when no earlier information is available. The new design of trigger-wheel also makes this new method more accurate and universal compared to previous solutions. This thesis demonstrates and argues for the advantages of using a dual sensor for speed and angular position detection on gear wheels. Were one sensor do quantitative measurements for pattern detection in the teeth arrangements and the other sensor do qualitative measurements for position detection.
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Srinivas, Achanta. "A Measurement Tool for Consumption Pattern of Hand wiping Tissue Paper." Thesis, Blekinge Tekniska Högskola, Avdelningen för maskinteknik, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2902.
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Due to environmental concerns and competition within the industry there is an imminent need by paper manufacturers to asses the paper consumption depending on the quality of the tissue paper. For this purpose, the consumption of tissue paper from a tissue vending machine needs to be monitored and calculated. A Hall Effect Sensor coupled with a Passive Infrared Sensor was used to monitor the flow of paper per Person. MATLAB is used as the programming language to read the signals from the sensors. The consumption obtained would be used to obtain better, less bulky design models. As well deduce an optimum paper dimensions to get reduce the paper consumption. Also, the FEM was done in ABAQUS for better blade design of Hand wiping system.achantasrinivas@gmail.com +46 704406894
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Yu, Yingbei. "Mechanical Dynamics of a Sensorless PMSynRel Drive." Thesis, KTH, Elektrisk energiomvandling, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-124546.
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Hybrid electric vehicle (HEV) concept has, combining conventional internal combustion engines and electric drives, gained more and more interest due to its environmental friendly features. A PMSynRel based electric drive is considered as a good option due to its high torque density and high efficiency. To reduce the overall cost of HEVs, the position resolvers can be replaced by Hall-sensors or using sensorless control. However, the dynamics of such electric drives may be degraded. The main objective of this MSc project is to develop torque dynamics of such electric drives when operating with/without a position sensor. The developed torque dynamic can be used to analyze the limits of hall senor/sensorless strategy when, e.g. anti-oscillation control isrequired. The torque dynamic is presented as a matrix based transfer function extracted from the speed responses and torque responses using Identification Tool Box in Matlab. Firstly, the transfer function was derived by means of simulations in both time and frequency domains. Secondly, similar procedures were applied to extract the transfer functions based on the experimental results.
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Ozturk, Salih Baris. "Modelling, simulation and analysis of low-cost direct torque control of PMSM using hall-effect sensors." Thesis, Texas A&M University, 2005. http://hdl.handle.net/1969.1/4905.
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This thesis focuses on the development of a novel Direct Torque Control (DTC) scheme for permanent magnet (PM) synchronous motors (surface and interior types) in the constant torque region with the help of cost-effective hall-effect sensors. This method requires no DC-link sensing, which is a mandatory matter in the conventional DTC drives, therefore it reduces the cost of a conventional DTC of a permanent magnet (PM) synchronous motor and also removes common problems including; resistance change effect, low speed and integration drift. Conventional DTC drives require at least one DC-link voltage sensor (or two on the motor terminals) and two current sensors because of the necessary estimation of position, speed, torque, and stator flux in the stationary reference frame. Unlike the conventional DTC drive, the proposed method uses the rotor reference frame because the rotor position is provided by the three hall-effect sensors and does not require expensive voltage sensors. Moreover, the proposed algorithm takes the acceleration and deceleration of the motor and torque disturbances into account to improve the speed and torque responses. The basic theory of operation for the proposed topology is presented. A mathematical model for the proposed DTC of the PMSM topology is developed. A simulation program written in MATLAB/SIMULINKî is used to verify the basic operation (performance) of the proposed topology. The mathematical model is capable of simulating the steady-state, as well as dynamic response even under heavy load conditions (e.g. transient load torque at ramp up). It is believed that the proposed system offers a reliable and low-cost solution for the emerging market of DTC for PMSM drives. Finally the proposed drive, considering the constant torque region operation, is applied to the agitation part of a laundry washing machine (operating in constant torque region) for speed performance comparison with the current low-cost agitation cycle speed control technique used by washing machine companies around the world.
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Alberti, Paolo. "Progetto e realizzazione di un sistema di test per sensori a effetto hall a banda larga." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9294/.
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Un ambito di largo interesse nel campo dell’elettronica, è quello delle misure di corrente a larga banda, in cui la richiesta per sistemi a basso costo è aumentata sensibilmente nel corso del tempo. La causa di questo interessamento è dovuto al più frequente utilizzo di sistemi switched power ad alta frequenza, che necessitano di sensori di correnti isolati e ad alte prestazioni.
L’intero lavoro prende in considerazione un sensore di nuova generazione per le misure di corrente, capace di raggiungere prestazioni oltre lo stato dell’arte.
L’elaborato presentato vede, quindi, come obiettivo la creazione di un setup stabile per effettuare misure sui chip prodotti. Partendo dallo studio di fattibilità, della componentistica necessaria e dei compromessi per mantenere i costi, si giunge ad una soluzione flessibile e adatta alle misurazioni richieste.
L’elaborato partirà con una introduzione sugli effetti fisici e la descrizione del componente fondamentale, passando a test funzionali effettuati su setup provvisori atti a ottenere informazioni basilari per la prosecuzione del lavoro. Infine verranno concepite e realizzate due schede a circuiti stampati per rispondere alle esigenze di progetto.
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Kršiak, Oliver. "Optimalizace modelu vodní elektrárny." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242054.
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This diploma thesis deals with the creation measuring instruments and program for controlling model hydropower plant intended for laboratory use. The first step is to improve the mechanical performance of the original model of hydroelectric power. The second step is to select a revive measuring instruments for electric values of the plant. The third step is to create a program for displaying electrical parameters and control the plant. The final step was re-measuring the operating characteristics of the generator model hydropower plant.
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ANDERSSON, JOHAN, and RICKARD HÖGLUND. "Electric Load Driven Longboard." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279809.
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This bachelor’s thesis aims to show an extensive overview of all the parts that build up an electric load driven longboard and see if a load controlled longboard can be seen as a safe, comfortable and convenient alternative to the more common remote controlled longboard. The thesis will also answer how weight can be measured on a longboard in the most effective way, what the most comfortable riding technique is and what a good motor-battery configuration to be able to travel at 30 km/h and 10 km would be. The longboard measures the weight distribution with load cells located between the deck and the trucks. An Arduino translates the input from the load cells to a certain speed and then sends it to an ODrive which controls a BLDC motor that is powered by two LiPo batteries. The results show that a load controlled longboard can very well be seen as a good alternative if right riding technique is used. The best technique is when the longboard accelerates when the rider tilts and keeps a constant speed when the rider stands straight. The best way to measure the weight is to fasten the trucks with hinges which lets the load cells register weight without anything interfering. Not all tests could be done because of Covid-19 but a measured top speed of 15 km/h with a high gear ratio is a promising result for the future when more suitable gear ratios will be tested to try to reach the goal of 30 km/h.Det här kandidatexamensarbetet strävar efter att visa en omfattande överblick på alla delar som bygger upp en elektrisk lastdriven longboard och se om en laststyrd longboard kan ses som ett säkert, komfortabelt och behändigt alternativ till den vanligare radiostyrda longboarden via handkontroll. Det här arbetet kommer också svara på hur vikt kan mätas på en longboard på ett så effektivt sätt som möjligt, vad som är den mest bekväma åkstilen och vad är en bra motor-batteri konfiguration för att kunna åka i 30 km/h och nå 10 km skulle vara. Longboarden mäter viktfördelningen med lastceller som är placerade mellan brädan och truckarna. En Arduino omvandlar indatan från lastcellerna till en specifik hastighet som den sedan skickar till en ODrive som kontrollerar en borstlös likströmsmotor som i sin tur är driven av två LiPo batterier. Resultaten visar att en laststyrd longboard kan mycket väl ses som ett bra alternativ om rätt åkstil används. Den bästa stilen är att longboarden accelererar när åkaren lutar sig och håller en konstant hastighet när åkaren står rakt. Det bästa sättet att mäta vikt är att montera truckarna på gångjärn som låter lastcellerna mäta vikt utan att något stör. Alla tester kunde inte utföras på grund av Covid-19 men en uppmätt topphastighet på 15 km/h med en hög utväxling är ett lovande resultat för framtiden när lämpligare utväxlingar kommer testas för att försöka nå målet på 30 km/h.
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Fikar, Vratislav. "Sledování provozních údajů manipulační techniky." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442351.
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Master’s thesis deals with the design of monitoring of handling equipment. Measured quantities are the switched-on state of the forklift, the time of active use, monitoring of transported material, and the total traveled distance. For each quantity, several possible sensing methods are outlined followed by a summary of the pros and cons of each method, which served as the basis for selecting the most suitable sensor for sensing the required information. The theoretical part of the thesis outlines the proposals in terms of both theoretical aspects as well as the implementation of the sensors along with proposals for possible mounting on a forklift. The proposed application was built on top of the Workmonitor RKC2.0 development kit, which was first developed for injection molding machine monitoring equipment. The proposed solution further expands the Workmonitor RKC2.0 software with additional features, such as forklift data collection, data processing, and streaming of collected data via WiFi to a local server. The final part then describes the mounting of sensors in the forklift, the final software changes, and the presentation of the collected data.
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Štajner, David. "Pohon EC motoru malého výkonu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-317120.
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The aim of this diploma thesis is to introduce a construction and controlling of the EC motor. On a base of knowledge make up a EC motor model in Matlab Simulink, with a position scanning providing by Hall probe. The EC motor model should be with its behavior close to the real EC motor as much as possible. There were a given requirements on the motor. On the base of those requirements was chosen a real EC motor. Its catalog values were put in the EC motor model in Matlab and the results were compared with real data. Next task was to design a real controlling driver of EC motor, which should has a minimal size. This driver was constructed and thermal test was made a on given load.
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Vaculík, Vlastimil. "Snímače proudu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219715.
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This diploma theisis deals with the theoretical analysis of the known types of current sensors, including for example, current transformers, shunts, and advanced sensors using Hall sensor or Rogowski coil. Subsequently, the rest of the work deals with the issue of current transducers with Hall sensors, without using a ferromagnetic circuit. For optimal currnet measure and overall precision, several possible options are designed and calculated. This includes number of sensing elements and distribution of sensors around the wires. Based on calaculation of magnetic intensity, related 3D charts ale plotted unsing Excel software. These charts illustrate the theoretical calculations of field distribution around conductors for various number of sensor. In the last part, components ale designed for practical implementation and scheme of electrical wiring. According to this scheme there is PCB designed as well. Whole current meter ir practically build and its results are compared with theoretical assumtions that are discussed in conclusion part of this theisis.
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Törnquist, Martin. "Investigation of rotational velocity sensors." Thesis, Linköping University, Department of Electrical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-15904.
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To improve the speed measurement of construction equipment, different sensor technologies have been investigated. Many of these sensor technologies are very interesting but to keep the extent of the thesis only two was chosen for testing, magnetic absolute angle sensors using Hall and GMR technology, to investigate if those are a valid replacement for the current measurement system that is using a passive sensor. Tests show that these sensors are capable of speed measurement, but because of noisy angle estimates they need filtering for good speed computation. This filtering introduces a large time delay that is of significance for the quality of the estimate. A Kalman filter has been implemented in an attempt to lower the time delays but since only a very simple model has been used it does not give any improvements over ordinary low pass filtering. For these sensors the mounting tolerance is of great interest. For best performance the offset between the sensor and magnet centres need to be kept small for both sensors. This is due to a non-linearity effect this causes. The distance between the sensors and the magnet is not critical for linearity issues, but only for the quality of the signal, where it might drop out when the distance is too large. This is where the sensor using GMR technology stands out. Compared to the Hall technology sensor, the GMR sensor can handle distances that are more than 10 times larger. The conclusion is that these sensors can be a valid replacement of the current measurement system. They will introduce more functionality with the capability of detecting rotational direction and zero velocity. In an application with more than one sensor they can also be used for more purposes, like detecting slip in clutches etc. Depending on the application, the time delays may not be critical, else more work need to be done to improve the estimate, e.g. with a more advanced model for the Kalman filter.
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Beck, Riley D. "High Voltage Analog Design in a Standard Digital CMOS Process." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd1092.pdf.
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ERICSON, JOAKIM, and ADAM WESTERMARK. "CheckMate : Remote Arduino powered chess." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279824.
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Board games are on the rise and chess is no exception. However, in an increasingly digitalized world these board games lack something in comparison to digitalized games, being able to play with anyone anywhere. This project aimed to combine these two worlds by being a physical game of chess where one could play against an opponent from far away. CheckMate is a robot consisting of an acrylic frame and various electronic components, such as an electromagnet, two stepper motors, a Hall eect sensor and a WiFi module. The electromagnet and Hall eect sensor were able to move using a belt and pulley system. This allowed magnetic pieces to be identified and dragged across the board. The board then communicated the location of all the pieces on the board, using Wifi, to an website that also kept track on whose turn it was. The result of this project was a robot that was able to perform all the moves necessary on the chessboard as well as communicating to the website. When moving a piece from one location to another the piece repelled other pieces on its way. However, this was deemed to be acceptable since the pieces were not moved too large of a distance for the electromagnet to attract them when moved into its square. One move that the robot was not able to perform was castling. The results can therefore bee seen as a starting point toward further developments.Brädspels popularitet stiger och schack är inget undantag. Dock saknar brädspel de digitala spelens möjlighet att spela med vem som helst varsomhelst. Detta projekt ville bygga över klyftorna mellan dessa två världar genom att vara ett fysiskt schackspel med de digitala spelens möjligheter. CheckMate är en robot byggd av akrylplast och diverse elektroniska komponenter sådan som en elektromagnet, två stegmotorer, en halleektsensor och en WiFi-modul. Elektromagneten och halleektsensorn förflyttades via ett system av kuggremmar drivet av stegmotorerna. Elektromagneten användes för att flytta pjäserna på brädet medan halleektsensorn användes vid kartläggning av pjäsernas position på brädet. Brädet kommunicerade, via trådlöst nätverk, till en hemsida som användes för att spara och överföra pjäsernas positioner. Projektet resulterade i en robot som kunde göra alla motsvarande drag hämtat från hemsidan. Dock så repellerade en flyttande pjäs på de stationära pjäserna när den passerade. Detta ansågs dock vara acceptabelt då elektromagneten kunde föra tillbaka pjäserna när den befann sig i dess ruta. Något som projektet ej lyckades utföra var draget rockad. Resultatet av detta projekt kan ses som en startpunkt i en vidareutveckling eller en färdig produkt vid obesvärad spelning.
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Long, Fei. "Three-Dimensional Motion Control and Dynamic Force Sensing of a Magnetically Propelled Micro Particle Using a Hexapole Magnetic Actuator." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1452093964.
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Massoumzadeh, Ramtin. "Realization of a serially-linked haptic device." Thesis, KTH, Maskinkonstruktion (Inst.), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-226164.
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Spatial haptic interfaces have existed for more than 20 years but have not been widespread despite promising applications. The few devices found in the market as of today are either considered costly, of higher quality and produced in smaller series or mass-produced and cheap, but of lower quality. This thesis aims to develop a new serially-linked everyday haptic desktop product under the project name Polhem. It aims to be based on the previous efforts of WoodenHaptics and AluHaptics, developed by Forsslund et al. The electronics and control software is shared between the WoodenHaptics, the AluHaptics as well as the Polhem designed and manufactured in this project. Polhem is capable of delivering forces in 3 DOF and its manipulandum is trackable in 6 DOF. Polhem is designed so as to eliminate problems related to angular tracking technologies currently used in some higher-end haptic devices.Spatiala haptiska gränssnitt har existerat i mer än 20 år men har trots sina lovande applikationer inte varit tillgänglig i någon större utsträckning. De få enheter som finns på marknaden i dagsläget anses antingen vara dyra, av högre kvalitet och produceras i mindre serier eller massproducerade och billiga, men av lägre kvalitet. Denna avhandling syftar till att utveckla en ny serielänkad haptisk produkt under projektnamnet Polhem. Polhem syftar till att baseras på de föregående enheterna WoodenHaptics och AluHaptics, som utvecklats av Forsslund et al. Elektroniken och reglermjukvaran delas mellan WoodenHaptics, AluHaptics och Polhem. Polhem kan leverera krafter i 3 frihetsgrader och dess manipulandum kan spåras i 6 frihetsgrader. Polhem är utformad så att den eliminerar problem relaterade till äldre vinkelspårningsteknologi som för närvarande används i många högpresterande haptiska enheter
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Jimenez, Grados Hugo Ricardo. "Contribuição no estudo do transmissor MOS split drain como sensor de campo magnetico." [s.n.], 1999. http://repositorio.unicamp.br/jspui/handle/REPOSIP/262040.
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Orientador: Carlos A. dos Reis FilhoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
Made available in DSpace on 2018-07-25T01:29:03Z (GMT). No. of bitstreams: 1 JimenezGrados_HugoRicardo_M.pdf: 6853818 bytes, checksum: 62615fbbddc4edfbbb2597b948dd2738 (MD5) Previous issue date: 1999
Resumo: : Este trabalho visa a familiarização com o dispositivo MOS- Split Drain através da construção de diferentes configurações geométricas, seguindo as regras da tecnologia CMOS - 0,8 Jl1Tlda AMS (Austria Mikrosysteme International), e de suas respectivas caracterizações elétricas e magnéticas. Medidas realizadas com os diversos protótipos fabricados permitiram a constatação de diversas características divulgadas na literatura e de suas limitações. O aprendizado que resulta deste trabalho é fundamental para o projeto que os pesquisadores do LPM2 - FEEC - UNICAMP ora realizam visando o desenvolvimento de um microsistema para a medição de consumo de energia elétrica
Abstract: This work aims at the familiarization with MOS- Split Drain transistors by constructing and measuring several units of different geometrical configurations, following the AMS (Austria Mikrosysteme International) design roles for CMOS 0.8 mm technology, and by characterizing the electrical and magnetic aspects of this device. Different prototypes were fabricated and measured, which allowed verifying either the validity or discrepancy of some of its properties published in the literature. The learning from this work is fundamental for the project, which is being carried on by researchers from LPM2 -FEEC - UNICAMP that are involved with the development of a novel microsystem for the measurement of electrical energy consumption
Mestrado
Mestre em Engenharia Elétrica
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Divín, Jan. "Měření směrových charakteristik antén." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-218898.
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This Master’s Thesis is dealing with measuring antennas in far field. Especially with automation this measure, direction sensors made by optical mouse, Integrated Hall ICs for Linear and Off-Axis Rotary Motion Detection and remote unit this workplace, which can made communication with PC by USB. It describes the making control program for the PC.