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1
Niemann, Andries Christiaan. "Self-sensing algorithms for active magnetic bearings / Andries C. Niemann." Thesis, North-West University, 2008. http://hdl.handle.net/10394/2644.
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Active magnetic bearings (AMBs) have become a key technology in industrial applications with a continued drive for cost reduction and an increase in reliability. AMBs require position feedback to suspend the rotor. Conventional contactless position sensors are used to measure the rotor's position. The major disadvantages of conventional position sensors are their cost and that the sensors are viewed as a weak point in an AMB system. A self-sensing sensor is a type of sensor which is cost effective, reduces sensor wire-length and increases reliability, thus ideal for the industry. This type of sensor relies on the current and voltage signals of the AMB's to obtain the rotor position. Due to the rapid and advanced development of digital electronics, it has become more powerful and cheaper, thus self-sensing in mass production will be cost effective. Different self-sensing approaches were developed in the past and can be divided into two main categories: state estimation and amplitude modulation approaches. In this research the focus will be on the amplitude modulation approach. Amplitude modulation makes use of two signals, namely the modulation signal and the carrier signal. In a self-sensing AMB system the carrier can be a high frequency component injected into the system or the switching ripple of the switch mode power amplifier can be used. The modulation signal is the change in rotor position which results in changing inductances. The actuator material introduces nonlinear effects on the estimated position. Due to these nonlinear effects, it is rather difficult to obtain the rotor position. The first industrial application of a self-sensing turbomolecular pump system was implemented in 2005 by S2M. The aim of this thesis is to evaluate existing self-sensing schemes, devise improvements and investigate possible new schemes. Four different demodulation methods and two new self-sensing schemes are evaluated. An AMB transient simulation model which includes saturation, hysteresis, eddy currents and cross-coupling is used to evaluate the schemes in simulation. The self-sensing schemes are implemented in hardware and evaluated on a 7 A rms 500 N AMB. A comparative study was done on the different self-sensing schemes. From the comparative study it was determined that the gain- and phase effects have a direct effect on the sensitivity of the system. It was also proved that self-sensing can be implemented on a coupled AMB with a sensitivity of 10.3 dB.Thesis (Ph.D. (Electrical and Electronic Engineering))--North-West University, Potchefstroom Campus, 2009.
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Montuschi, Antonio. "Studio di componenti commerciali per sensing induttivo." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8646/.
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Questa tesi ha lo scopo di indagare un particolare circuito commerciale che può connettersi con un sensore induttivo: l'LDC1000. Vi sono elencate e spiegate tutte le caratteristiche e le modalità di funzionamento con i link dove è possibile scaricare tutta la documentazione ufficiale del costruttore
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Farnsworth, Bradley David. "Wireless Implantable EMG Sensing Microsystem." Case Western Reserve University School of Graduate Studies / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1276263665.
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Davis, Joseph P. "Electronic Interface for an Inductive Wear Debris Sensor for Detection of Ferrous and Non-Ferrous Particles." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1380998832.
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Růžek, Václav. "Řídicí jednotka pro zjišťování polohy kovové šipky v terči." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217912.
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Problematics of sensing position metal darts in targets is new and in this time is no too explored problem. This work analyses accessible method, what can realize this scan. There are lot of accessible methods like best applicable reflect method inductive, based on change inductivity and method capacitive, based on change capacities tabular condenser. Capacitive sensing should be realized by the plate couple, where stiring electrode supplies signal.Sensing electrode receiving this signal. On the basis changes thorough electrostatic field measures change capacities. By the changes capacities fit algorithm we can evaluate, whether is in sensing field visible foreign subject – dart. For capacitive method is also designed driving and scanning unit. Various method were to be laboratory tested and was achieved satisfactory results.
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Bayoudh, Meriam. "Apprentissage de connaissances structurelles à partir d’images satellitaires et de données exogènes pour la cartographie dynamique de l’environnement amazonien." Thesis, Antilles-Guyane, 2013. http://www.theses.fr/2013AGUY0671/document.
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Les méthodes classiques d'analyse d'images satellites sont inadaptées au volume actuel du flux de données. L'automatisation de l'interprétation de ces images devient donc cruciale pour l'analyse et la gestion des phénomènes observables par satellite et évoluant dans le temps et l'espace. Ce travail vise à automatiser la cartographie dynamique de l'occupation du sol à partir d'images satellites, par des mécanismes expressifs, facilement interprétables en prenant en compte les aspects structurels de l'information géographique. Il s'inscrit dans le cadre de l'analyse d'images basée objet. Ainsi, un paramétrage supervisé d'un algorithme de segmentation d'images est proposé. Dans un deuxième temps, une méthode de classification supervisée d'objets géographiques est présentée combinant apprentissage automatique par programmation logique inductive et classement par l'approche multi-class rule set intersection. Ces approches sont appliquées à la cartographie de la bande côtière Guyanaise. Les résultats démontrent la faisabilité du paramétrage de la segmentation, mais également sa variabilité en fonction des classes de la carte de référence et des données d'entrée. Les résultats de la classification supervisée montrent qu'il est possible d'induire des règles de classification expressives, véhiculant des informations cohérentes et structurelles dans un contexte applicatif donnée et conduisant à des valeurs satisfaisantes de précision et de KAPPA (respectivement 84,6% et 0,7). Ce travail de thèse contribue ainsi à l'automatisation de la cartographie dynamique à partir d'images de télédétection et propose des perspectives originales et prometteusesClassical methods for satellite image analysis are inadequate for the current bulky data flow. Thus, automate the interpretation of such images becomes crucial for the analysis and management of phenomena changing in time and space, observable by satellite. Thus, this work aims at automating land cover cartography from satellite images, by expressive and easily interpretable mechanism, and by explicitly taking into account structural aspects of geographic information. It is part of the object-based image analysis framework, and assumes that it is possible to extract useful contextual knowledge from maps. Thus, a supervised parameterization methods of a segmentation algorithm is proposed. Secondly, a supervised classification of geographical objects is presented. It combines machine learning by inductive logic programming and the multi-class rule set intersection approach. These approaches are applied to the French Guiana coastline cartography. The results demonstrate the feasibility of the segmentation parameterization, but also its variability as a function of the reference map classes and of the input data. Yet, methodological developments allow to consider an operational implementation of such an approach. The results of the object supervised classification show that it is possible to induce expressive classification rules that convey consistent and structural information in a given application context and lead to reliable predictions, with overall accuracy and Kappa values equal to, respectively, 84,6% and 0,7. In conclusion, this work contributes to the automation of the dynamic cartography from remotely sensed images and proposes original and promising perpectives
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Velicheti, Dheeraj. "Nondestructive Residual Stress Assessment of Shot-Peened IN718 Using Hall Coefficient Spectroscopy." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin161374262949063.
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Bhadra, Sharmistha. "Electrode-based wireless passive pH sensors with applications to bioprocess and food spoilage monitoring." IEEE, 2011. http://hdl.handle.net/1993/30366.
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This thesis purposes and develops inductively coupled LC (inductive-capacitive) pH sensors based on pH-sensitive electrode pair. The LC resonator circuit is based on a varactor and measures the low frequency potential difference. For wireless pH monitoring, the resonator circuit is integrated with a pH-sensitive electrode pair. This sensor demonstrates a linear response over 2 to 12 pH dynamic range, 0.1 pH accuracy and long-term stability. Accurate measurement of pH using electrode-based sensors is affected by temperature variation. A technique of simultaneously measuring two parameters, pH and temperature, with a single RLC resonator based sensor is presented. An algorithm is developed, which applies both pH and temperature measurement to incorporate temperature compensation in pH measurement. For in-fluid applications, an encapsulation method is applied to the LC resonator based sensor to reduce the influence of medium permittivity and conductivity on the sensor measurement. Non-invasive way to obtain reliable pH information from bacterial culture bioprocesses is demonstrated with the fluid embeddable sensor. The pH sensor is remodeled to an acidic and basic volatile sensor by embedding the electrodes in a hydrogel host electrolyte. Tests demonstrate that the volatile sensor has a detection limit of 1.5 ppm and 2 ppm for ammonia and acetic acid vapor, respectively. Application of the volatile sensor to fish spoilage monitoring shows that the sensor is capable of detecting the product rejection level with good sensitivity in real-time. It is important to develop low cost wireless passive pH sensor technologies for embedded applications such as bioprocess and food spoilage monitoring. The electrode-based passive LC sensor approach employed in this thesis overcomes drawbacks of some of the early developed passive pH sensors and can lead to an inexpensive implementation using printed electronics technology.
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Zhu, Chaoying. "Induction motor speed sensing and control." Thesis, University of Sussex, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358985.
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Goldblatt, William M. "Electromagnetic induction sensing of individual tracer particles in a circulating fluidized bed." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30918.
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Understanding the trajectories of particulate solids inside a flow-through reactor, such as the riser of a recirculating fluidized bed, is a basic requisite to accurately modelling the reactor. However, these trajectories, which are complicated by gross internal recirculation,
are not readily measurable. Conventional means of measuring the residence time distribution can be applied to closed boundaries, such as the exit of the riser. Doing so, however, does not directly provide the details of the trajectories within the riser. In order to determine these trajectories, meaningful measurements must be made at the open boundaries between the adjacent axial regions which, in total, make up the riser. Transient tracer concentration measurements at open boundaries are ambiguous because, as tracer material recirculates past the sensor, its concentration is repeatedly recorded, with no distinction as to which region (above or below the boundary) it has just resided in.
A method designed to eliminate this ambiguity at open boundaries is reported in this thesis. By repeatedly introducing single tracer particles into the riser, and measuring the time of passage through each axial region, the residence time distributions for each region can be obtained from the frequency density of these times. The crux of this approach is being able to sense individual tracer particles. The major thrust of this investigation has been to find a practical means to this end. The final sensor considered in this investigation is based on electromagnetic induction: a magnetic primary field induces an eddy current in a conductive tracer particle, and the resulting secondary field is sensed, indicating the presence of the tracer particle in the sensing volume. Noise, resulting from direct coupling between transmitter and receiver coils, electrostatics, and vibrations, determines the sensitivity of the device. The final prototype sensor is limited in sensitivity to relatively large tracer particles, and it is incapable of measuring tracer velocity. Nevertheless, the trajectory of large particles is of practical significance for circulating fluidized beds. Limited tests were conducted in a 0.15 m ID x 9.14 m tall acrylic riser where the tracer particles were injected opposite the solids re-entry point, and were sensed by a single sensor located at an open boundary 7.5 m downstream. At each of the two superficial gas velocities considered, and above a threshold solids flux, the time-of-flight frequency density between the injector and the sensor for these large tracer particles does not change with increasing flux of the fine solids. This result is incongruous with obvious changes in the macro-flow structure occurring in the riser.
Recommended changes in the sensor would allow measurement of the direction and speed of the tracer, as it passes by the sensor, as well as potentially reducing noise. With these improvements, it would be useful to install multiple sensors along the full length of
the riser. The information obtainable from such a configuration would greatly enhance understanding of the detailed trajectories within the riser.Applied Science, Faculty of
Chemical and Biological Engineering, Department of
Graduate
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Amakor, Xystus N. "Using Electromagnetic Induction Sensing to Understand the Dynamics and Interacting Factors Controlling Soil Salinity." DigitalCommons@USU, 2013. https://digitalcommons.usu.edu/etd/1723.
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Soil salinization is of great concern in the irrigated arid and semi-arid western United States due to its threat to sustainable agricultural productivity and thus is closely monitored. A widely accepted and traditional standard method for estimating soil salinity is the electrical conductivity of the saturated paste extracts (ECe). However, this method underestimates salinity due to ion pair formation in high ionic strength solution. Numerous studies have recommended the use of an electromagnetic induction (EMI) sensing technique to monitor field-scale soil salinity due to rapidness and non-destructiveness of the sampling. However, because the EMI measurement (ECa) is related to a host of soil properties, calibrating ECa to salinity in a non-homogeneous setting is particularly challenging. The main objective of this study is to understand the dynamics and interacting factors controlling soil salinity using an EMI sensor. Specifically, a correction is made for the underestimation of soil salinity from saturated paste extracts, and a calibration model is developed that is capable of predicting salinity directly from ECa despite the non-homogeneity of potential perturbing factors. A comparison is made of salinity measurement methods based on soil saturated pastes with respect to specific soil management goals. Results show that ion pairing exists even in low ionic strength solution and by diluting the saturated paste extracts to conductivities ≤ 0.03 dS m -1 (ECed), ion pairing is minimized. An improved salinity estimate is obtained by computing total dissolved solids (TDS, in mM) from the ECed values, and then multiplying the TDS by the dilution factor. We also developed a calibration model using quantile regression, which makes no assumption about the distribution of the errors, and which is capable of predicting low range soil salinity (such as that in calcareous soils) from ECa depth-weighted measurements (ECH25ECe). A comparison of ECe, ECed, ECH25ECe, and direct measurement of EC in soil pastes (“ Bureau of Soils Cup ” method, ECcup) across six depths, three texture groups, and the combinations of EC method and depth or texture groups, supports the use of the ECH25ECe method to rapidly and reliably monitor salinity in calcareous soils of arid and semiarid regions.
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McMaster, Shaun Kenneth. "Role of pathogen sensing pathways in the induction of inflammatory genes : relevance to cardiothoracic diseases." Thesis, Imperial College London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.444144.
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Krueger, Kyle R. "Model design for algorithmic efficiency in electromagnetic sensing." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50402.
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The objective of the proposed research is to develop structural changes to the design and application of electromagnetic (EM) sensing models to more efficiently and accurately invert EM measurements to extract parameters for applications such as landmine detection. Two different acquisition modalities are addressed in this research: ground-penetrating radar (GPR) and electromagnetic induction (EMI) sensors. The models needed for practical three-dimensional (3D) spatial imaging typically become impractically large, with up to seven dimensions of parameters that need to be extracted. These parameters include, but are not limited to target type, 3D location, and 3D orientation. The new special structures for these models exploit properties such as shift invariance and tensor representation, which can be combined with strategic inversion techniques, including the Fast Fourier Transform and semidefinite programming. The structures dramatically reduce the amount of computation and can eliminate the need to store up to five dimensions of parameters while still accurately estimating them.
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Sea, Claiborne. "Native American Occupation of the Singer-Hieronymus Site Complex: Developing Site History by Integrating Remote Sensing and Archaeological Excavation." Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/etd/3471.
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Located on a ridgetop in central Kentucky, the Singer-Hieronymus Site Complex consists of at least four Native American villages. The Native Americans who lived there are called the “Fort Ancient” by archaeologists. This study examined relationships between these villages, both spatially and temporally, to build a more complete history of site occupation. To do this, aerial imagery analysis, geophysical survey, and archaeological investigations were conducted. This research determined there were differences among villages in terms of their size, however other characteristics—internal village organization, village shape, radiometric dates, and material culture—overlapped significantly. Additionally, landscape-scale geophysical survey identified at least three potentially new villages. It has been suggested that Fort Ancient groups abandoned villages every 10 to 30 years due to environmental degradation, but these results suggest that native peoples did not abandon villages at Singer-Hieronymus. Current thought surrounding Fort Ancient village abandonment and reoccupation must therefore be reconsidered.
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Zaban, Beatrix [Verfasser], and P. [Akademischer Betreuer] Nick. "How plant cells explore geometry - The polarity induction and geometry sensing in BY-2 tobacco protoplasts / Beatrix Zaban. Betreuer: P. Nick." Karlsruhe : KIT-Bibliothek, 2014. http://d-nb.info/106673674X/34.
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Schubert, Michael [Verfasser], Doncker Rik W. [Akademischer Betreuer] De, and Axel [Akademischer Betreuer] Mertens. "High-precision torque control of inverter-fed induction machines with instantaneous phase voltage sensing / Michael Schubert ; Rik Wivina Anna de Doncker, Axel Mertens." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1187346632/34.
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Inanlou, Farzad Michael-David. "Innovative transceiver approaches for low-power near-field and far-field applications." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52245.
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Wireless operation, near-field or far-field, is a core functionality of any mobile or autonomous system. These systems are battery operated or most often utilize energy scavenging as a means of power generation. Limited access to power, expected long and uninterrupted operation, and constrained physical parameters (e.g. weight and size), which limit overall power harvesting capabilities, are factors that outline the importance for innovative low-power approaches and designs in advanced low-power wireless applications. Low-power approaches become especially important for the wireless transceiver, the block in charge of wireless/remote functionality of the system, as this block is usually the most power hungry component in an integrated system-on-chip (SoC). Three such advanced applications with stringent power requirements are examined including space-based exploratory remote sensing probes and their associated radiation effects, millimeter-wave phased-array radar for high-altitude tactical and geological imaging, and implantable biomedical devices (IMDs), leading to the proposal and implementation of low-power wireless solutions for these applications in SiGe BiCMOS and CMOS and platforms.
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Dutra, Camila Braga. "Desenvolvimento e validação de métodos analíticos para a determinação de contaminantes em polietileno tereftalato e polietileno de alta densidade pós-consumo." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/256316.
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Orientadores: Felix Guillermo Reyes Reyes, Maria Teresa de Alvarenga FreireTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos
Made available in DSpace on 2018-08-16T23:01:27Z (GMT). No. of bitstreams: 1 Dutra_CamilaBraga_D.pdf: 1974104 bytes, checksum: 7a0aae96f3654e27fb7d553ee756e522 (MD5) Previous issue date: 2010
Doutorado
Doutor em Ciência de Alimentos
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Gaona, Garcia Jaime. "Groundwater-stream water interactions: point and distributed measurements and innovative upscaling technologies." Doctoral thesis, Università degli studi di Trento, 2019. http://hdl.handle.net/11572/242544.
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The need to consider groundwater and surface water as a single resource has fostered the interest of the scientific community on the interactions between surface water and groundwater. The region below and alongside rivers where surface hydrology and subsurface hydrology concur is the hyporheic zone. This is the region where water exchange determines many biogeochemical and ecological processes of great impact on the functioning of rivers. However, the complex processes taking place in the hyporheic zone require a multidisciplinary approach.
The combination of innovative point and distributed techniques originally developed in separated disciplines is of great advantage for the indirect identification of water exchange in the hyporheic zone. Distributed techniques using temperature as a tracer such as fiber-optic distributed temperature sensing can identify the different components of groundwater-surface water interactions based on their spatial and temporal thermal patterns at the sediment-water interface. In particular, groundwater, interflow discharge and local hyporheic exchange flows can be differentiated based on the distinct size, duration and sign of the temperature anomalies. The scale range and resolution of fiber-optic distributed temperature sensing are well complemented by geophysics providing subsurface structures with a similar resolution and scale. Thus, the use of fiber-optic distributed temperature sensing to trace flux patterns supported by the exploration of subsurface structures with geophysics enables spatial and temporal investigation of groundwater-surface water interactions with an unprecedented level of accuracy and resolution.
In contrast to the aforementioned methods that can be used for pattern identification at the interface, other methods such as point techniques are required to quantify hyporheic exchange fluxes. In the present PhD thesis, point methods based on hydraulic gradients and thermal profiles are used to quantify hyporheic exchange flows. However, both methods are one-dimensional methods and assume that only vertical flow occurs while the reality is much more complex. The study evaluates the accuracy of the available methods and the factors that impact their reliability. The applied methods allow not only to quantify hyporheic exchange flows but they are also the basis for an interpretation of the sediment layering in the hyporheic zone.
For upscaling of the previous results three-dimensional modelling of flow and heat transport in the hyporheic zone combines pattern identification and quantification of fluxes into a single framework. Modelling can evaluate the influence of factors governing groundwater-surface water interactions as well as assess the impact of multiple aspects of model design and calibration of high impact on the reliability of the simulations. But more importantly, this modelling approach enables accurate estimation of water exchange at any location of the domain with unparalleled resolution. Despite the challenges in 3D modelling of the hyporheic zone and in the integration of point and distributed data in models, the benefits should encourage the hyporheic community to adopt an integrative approach comprising from the measurement to the upscaling of hyporheic processes.
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Chen, Ye 1986. "Design of magneto-inductive waveguide for sensing applications." Thesis, 2014. http://hdl.handle.net/2152/29146.
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This dissertation has been motivated by the increasing application of sensing technologies in structural health monitoring. Many wireless sensor techniques exist for structural health monitoring while a challenge faced is the finite lifetime of batteries. The objective of this dissertation is to develop passive wireless technology to provide early warning of conditions that damage the structure. In this dissertation, sensing mechanism is proposed based on time and frequency domain characteristics of magneto-inductive (MI) waves. Experimental results are also presented to demonstrate the sensing mechanism. MI waves are predominantly magnetic waves that are supported in periodic arrays of magnetically coupled resonators and propagate within a narrow frequency band around the resonant frequency. The array is to be embedded in a structure and different types of transducers can be integrated for different sensing applications. With the onset of structure defect, the transducer introduces an impedance discontinuity that generates reflected MI waves along the array, which are monitored and processed by Smoothed Wigner-Ville distribution (WVD) to extract time-of-flight for frequency components in the narrow passband. The transmission and reflection coefficients of MI waves are also investigated based on the lumped-element circuit model of the array. Based on MI waves travel time, amplitude and group velocity, the position and severity of structure defect are decided. The sensing mechanisms for different distribution of defects are proposed. The validity of the sensing mechanism is examined in experiments. The guided wave testing is implemented in one-dimensional square-shaped printed spiral resonators with Q-factor of 161 at 13.6 MHz. It demonstrates that low MI waves propagation loss is achieved with value of 0.098 dB per element at mid-band with center-to-center distance of half an inch. A pitch-catch measurement system is built to capture traveling MI signal in resonant element and extract group velocity, and a pulse-echo measurement system is designed to monitor reflected MI signal and locate structure discontinuity. In both measurement systems, MI waves are excited with wide bandwidth voltage pulse, and a digitizer is attached to sense the MI signal in a specific resonant element circuit. A baseline signal is obtained from the healthy state to use as reference and comparison with the test case using pitch-catch system. The test signal subtracted from baseline signal infers the structure damage information with time and frequency domain characteristics. It can offer an effective method to estimate the structure discontinuity location, severity and type of damage. The experimental results are consistent with the theoretical predictions. At the end, future directions for the research to integrate with other technologies are suggested.text
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Chang, Heng Chung, and 張恒中. "The Study of the Magnetostrictive Type Inductive Sensing Micro Transducers." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/xxya77.
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博士國立清華大學
動力機械工程學系
104
This study presents a magnetostrictive type inductive sensing transducer which consisted of a planar coil, magnetic films, and a force supporting structure. As the force supporting structure deformed by an external load, the inverse magnetostriction effect would cause permeability changes of the magnetic films. Thus, the permeability changes as well as the external load can be detected by the inductance change of a planar inductor. To demonstrate the feasibility of the proposed transducer, pressure sensor designs which include the pressure supporting diaphragm, the planar coil and the patterns of magnetic films are fabricated and tested. Preliminary measurements show that the pressure sensor with 6 coil turns has sensitivities of 0.079%/kPa. In addition, based on the pattern design of the magnetic films, the gauge factor could be tuned from 55 to 852. Moreover, the wireless sensing capability of the magnetostrictive type inductive sensing CMOS-MEMS pressure transducers are also demonstrated using the post CMOS process. Metal and dielectric layers of CMOS process are employed to form the planar coil and the pressure supporting diaphragm, respectively. An additional magnetostrictive film was patterned by the post CMOS process. This study further proposes a new process scheme to fabricate a polymer structure with embedded metal on the silicon substrate. Based on the proposed scheme, a magnetostrictive type flexible tactile transducer consisting of a polymer structure with embedded Ni coil winding is successfully exploited.
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Yu, Sung-Chu, and 余松築. "A Flexible Inductive Coil Tag for Household Two-Wire Current Sensing Applications." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/27401910084174541184.
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碩士國立交通大學
電子研究所
100
This thesis will demonstrate a flexible current sensor tag designed with inductive coils for sensing the current in the power cords of household-goods. The design methods for coils with air and NiFe (Ni71% Fe29%) magnetic material are compared. When the sensor is placed in proximity to a wire carrying AC electric current, a induced voltage in the inductive coils proportional to the current being measured and use a previously developed SU-8 flexible technology to reach better proximity to the power cord for maximizing induced voltage output. With three kind of different line widths and turns coil design in an area of 0.5 x 1 cm2, for a 90-turns coil design, the sensor tag can provide a sensitivity of 68.5μV/A for detecting 60Hz electric current in the ampere regime.
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Chuang, Jia-Min, and 莊家民. "An implantable PRF stimulator with inductive coupling impedance sensing for pain relief." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/273289.
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碩士國立臺北科技大學
電腦與通訊研究所
99
Recent years, every industrial are concern about the biomedical chips. Then in this will be proposed a new method for implant stimulator in long term curing and measuring tissue hyperplasia with increase impedance problem. In this paper also cooperate with Institute Biomedical Engineering NTU NSC project. For curing low back pain in spine L4 and L5, then stimulated L4 and L5 nerves by PRF (Pulse Radio Frequency) 2Hz and 25ms short pulse in spine nerve blocking pain signal path to brain. A implant device within long term implant in human body that also find this kind of problem tissue hyperplasia it will increase impedance between electron and tissue. For the stimulating treatment will not achieve desired result in the ideal. To avoid this problem happened, this paper proposed a new method by using two coil then sensing the implant tissue impedance. It can feedback impedance information for doctor. Then making a correct decision in curing stimulates pulse voltage increase or not. By using wireless power deliver into the implant device. The power can be controlled outside with more safety concerns.
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Yeh, Sheng-Kai, and 葉勝凱. "Design and Implementation of a Novel CMOS-MEMS Inductive-type Tactile Sensor with Wireless Sensing Potential." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/7wn8sv.
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碩士國立清華大學
動力機械工程學系
105
This study presents a novel inductive-type tactile sensor with deformable polymer layer. The sensing principle of the structure is mainly dominated by the distance between sensing coil and metal contact interface. After applying the load on the metal contact interface, the polymer filler above the sensing coil would deform which decrease the distance between sensing coil and metal contact interface. Hence, the inductance of the planar coil would change due to the change of magnetic flux. CMOS-MEMS 1P6M standard process is utilized because of its great electrical routing ability, therefore, we can have high compact coil at specific area. By designing the sensing coil, controlling the thickness and varying the mechanical property of polymer, different sensitivity and sensing range of the tactile sensor can be derived. The preliminary simulation result shows the feasibility of such idea. The measurements of the sensor are carried out after fabrication to verify the sensing mechanism, and the wireless sensing capability is also demonstrated. Furthermore, the performance of the device integrated with the chrome steel ball is implemented. After the characterization of the basic performance of the inductive tactile sensor, the other testing conditions are fully discussed in the thesis. Finally, the specification of the device is presented.
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"CMOS On-Chip 3D Inductor Design & Application in RF Bio-Sensing." Master's thesis, 2012. http://hdl.handle.net/2286/R.I.14568.
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abstract: Three-dimensional (3D) inductors with square, hexagonal and octagonal geometries have been designed and simulated in ANSYS HFSS. The inductors have been designed on Silicon substrate with through-hole via with different width, spacing and thickness. Spice modeling has been done in Agilent ADS and comparison has been made with results of custom excel based calculator and HFSS simulation results. Single ended quality factor was measured as 12.97 and differential ended quality factor was measured as 15.96 at a maximum operational frequency of 3.65GHz. The single ended and differential inductance was measured as 2.98nH and 2.88nH respectively at this frequency. Based on results a symmetric octagonal inductor design has been recommended to be used for application in RF biosensing. A system design has been proposed based on use of this inductor and principle of inductive sensing using magnetic labeling.Dissertation/Thesis
M.S. Electrical Engineering 2012
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Brown, Ian P. "Design rules for induction machine self-sensing." 2009. http://www.library.wisc.edu/databases/connect/dissertations.html.
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Zhang, Sheng active 2013. "Passive inductively coupled wireless sensor for dielectric constant sensing." 2013. http://hdl.handle.net/2152/21728.
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In order to address the challenges of capacitive sensing in harsh environment, self resonant passive wireless sensors are studied. The capacitive sensing elements based on interdigitated capacitor (IDC) sensor are used. A semi-empirical model providing accurate capacitance calculation for IDCs over a wide range of dimensions and dielectric constants is developed. An equivalent circuit model based on electric field distribution is proposed, leading to a closed form approximation for IDC capacitance calculation. The conductivity of the material under test is also considered and a model is proposed to calculate effective capacitance as a function of conductivity and measurement frequency. The model is used to study the design optimization of IDC sensor and suggested design procedure is proposed. To wirelessly interrogate the capacitive sensor, it is connected to an inductive element to form a resonant circuit, while the measurement is made at remote reader coil. Advantages and disadvantages of different type of resonant structure design are analyzed. In order to assist the design process, a SPICE circuit model is developed to estimate the resonant frequency of the self resonant sensor. Miniaturized sensors with different dimensions are designed, fabricated and tested. The sensor is integrated with silicon nanowire fabric coated with polymer. Measurements are made to illustrate the enhancement in sensing capability by integrating chemical selective material.text
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Giebeler, Christopher. "Implementation and evaluation of an amplitude-based self-sensing torque control for induction machines." 2002. http://catalog.hathitrust.org/api/volumes/oclc/50250003.html.
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Thesis (M.S.)--University of Wisconsin--Madison, 2002.Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 225-231).
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Kenny, Barbara H. "Deadbeat direct torque control of induction machines using self-sensing at low and zero speed." 2001. http://www.library.wisc.edu/databases/connect/dissertations.html.
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Yang, Jung-Hui, and 楊榮慧. "Induction of Mechanical Pain by Interdependent Downregulation between K+ Channel Kv4.3 and Accessory KChIP1 in Pain-Sensing Neurons." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/90509963481417683197.
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碩士國立陽明大學
神經科學研究所
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Kv4 channels evoke A-type K+ currents which play a critical role in regulating neuronal excitability. Native Kv4 channels function in complex comprising Kv4 α-subunits and accessory β-subunits, such as cytosolic K+ channel interacting proteins (KChIPs) and transmembrane dipeptidyl peptidase like proteins (DPPLs). Compared with Kv4 α-subunits alone, A-type K+ currents are robustly increased when they are co-expressed with accessory β-subunits in heterologous systems. The protein expression of Kv4 α- or β- subunits affect protein levels of the other. However, the related physiological significance has not been explored. Kv4.3, one of the Kv4 α-subunits, is expressed selectively in the cell bodies of a subset of pain-sensing neurons and its down-regulation induces mechanical pain. In this study, we found that KChIP1 and Kv4.3 were co-expressed in a subset of pain-sensing neurons. In a neuropathic pain model induced by lumbar spinal nerve ligation in the rat, the protein level of KChIP1 was reduced in pain-sensing neurons, same as that of Kv4.3. After knockdown either KChIP1 or Kv4.3 expression by intrathecal injection of gene-specific antisense oligonucleotide, KChIP1 and Kv4.3 protein levels were simultaneously decreased in pain-sensing neurons and mechanical hypersensitivity was induced. We also examined that knockdown effect of another Kv4 β-subunit DPP10, whose mRNA has been detected in the DRG. Our data showed that mechanical hypersensitivity was induced although Kv4.3 protein level was not affected. These data reveal that after decreasing either KChIP1 or DPP10 β-subunit in the DRG, mechanical pain develops. Kv4.3 and KChIP1 protein levels are co-dependent, whereas DPP10 and Kv4.3 protein levels are not.