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1
Wiederhold, Curtis P. "Analytical Comparison of Multimicrophone Probes in Measuring Acoustic Intensity." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/3076.
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In the late 1970s, a method was developed to estimate acoustic intensity in one dimension by taking the cross-spectral density of two closely-spaced microphone signals. Since then, multimicrophone probes have been developed to measure three-dimensional intensity as well as energy density. Their usefulness has led to the design of various types of multimicrophone probes, the most common being the four-microphone orthogonal, the four-microphone regular tetrahedron, and the six-microphone designs. These designs generally either consist of microphones suspended in space near each other or mounted on the surface of a sphere. This work analytically compares the relative merits of each probe design in measuring acoustic intensity and investigates the various finite-sum and finite-difference processing methods used with each. The analysis is limited to probes consisting of perfect point sensors in plane wave fields. The comparison is given in terms of average and maximum errors for intensity magnitude and direction as a function of angle of incidence as well as the spread between maximum and minimum errors for intensity magnitude. After existent probe geometries are reviewed, optimization techniques are introduced to predict what the optimal probe geometry would be for any given scenario. The probe is optimized to give the lowest intensity error averaged over angle of incidence of plane waves. This is done for full-space and half-space scenarios.
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Karuc, Emre. "Design Of A Touch Trigger Probe For A Coordinate Measuring Machine." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12609112/index.pdf.
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Coordinate Measuring Machines (CMMs) have been widely used in industry in
order to determine the form / dimensional tolerances of workpieces with very
complicated geometrical shapes. Therefore, CMM is an important tool during the
manufacturing and quality control phases. Workpiece to be measured on a CMM is
probed via touch trigger probe through its stylus tip. In other words, by virtue of the
touch trigger probes CMM can acquire the dimensional data of the workpiece that is
to be measured. Therefore the probe has become the most vital and fundamental
part of the CMM. In this thesis, a novel type of touch trigger probe / scanning probe
is proposed. The proposed probe can also be used as a scanning probe for different
applications. The main purpose of this thesis is to develop a novel type of touch
trigger / scanning probe that has different kinematic stage and sensing stage than the
other probes currently used in the industry. Giant Magnetoresistive (GMR) sensors
are used for building the sensing stage of the proposed probe. GMR sensors are
selected due to their outstanding sensitivity to small disturbances. Furthermore, in order to test the proposed probe<br>an anvil gauge setup is designed and proposed in
this study. Finally, proposed probe is tested on a three-axis computer controlled
electrical discharge machine (EDM), and the results acquired from those
experiments are discussed.
3
Yang, Qingping. "A hig precision probe system for three dimensional coordinate measurement." Thesis, Brunel University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339317.
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Sieberg, Jennifer Lynn. "Measuring Experimental Design Ability: A Test to Probe Critical Thinking." Bowling Green, Ohio : Bowling Green State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=bgsu1214238271.
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Griffin, Yve. "Measuring children's reaction times to pictures using dot probe paradigm." Thesis, University of East Anglia, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501114.
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Aggression is a pervasive, wide spread problem that has a number of implications, one of which is the quality of the individual's relationship with peers, as they are often socially maladiusted. The Social Information Processing Model (Crick & Dodge, 1994) has frequently been used to conceptualise the difficulties socially maladjusted children experience, with one proposal being that they selectively attend to hostile or threatening cues in the environment. This study attempted to addresses weaknesses in the traditional methodology used to assess the model's applicability by proposing an alternative methodology, using a dot probe task. Based on the assumptions made by the model, it was hypothesised that children rated as experiencing difficulties, particularly in the form of conduct problems or peer relationships, would demonstrate an attentional bias towards hostile or ambiguous pictures. The hypotheses were tested using a correlational design, with a sample of 72 boys aged 11 to 13 years, recruited from local secondary schools. Data relating to the participants' social adjustment was gathered from both parents and the participants, using the appropriate versions of the Strengths and Difficulties Questionnaires.
6
Verfl, Jan. "Aplikace měřicích sond v procesu soustružení." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229354.
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My diploma work is focused on implementation of measuring probe to process of cutting operation by turning and description of their effective usage ways. Measuring probe are used as correction during turning process or to control measuring of turning work eventually to signal mistake in process. In practical part the laser measuring probe is used to control shaft functional dimensions. Measuring is done after tooling and it substitute exit control. Laser probe was also reviewed regarding usability for given purpose as measurement tool and in the same time were reviewed time and cost differences against alternative turning process.
7
Gu, Jianwen Wendy 1981. "Measuring mechanical properties of the tectorial membrane with a microfabricated probe." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28530.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Biological Engineering Division, 2004.<br>Includes bibliographical references (leaf 39).<br>Dynamic material properties of the isolated mouse tectorial membrane (TM) were quantified by applying sinusoidal shearing forces to the TM with a microfabricated probe (contact area 30 x 30 [micro]m²). Forces in the range 30-300 nN with frequency in the range 10-9000 Hz were applied tangentially to the surfaces of four TM specimens. We found that TM displacement was linear with respect to force. The TM exhibited both elastic and viscous characteristics, with the elastic behavior being more prominent. The elastic and viscous components of TM impedance remained proportional through two decades of frequency. The radial impedance was approximately three times larger than the longitudinal impedance. The point stiffness of the TM increased with frequency when radial forces were applied but showed no trend with frequency for longitudinal forces. Displacement of surrounding tissue decreased as distance from the probe increased. Space constants were on the order of tens of micrometers. These results represent the most detailed shear measurements to date of the isolated TM and are consistent with those obtained using the magnetic bead method [AF00].<br>by Jianwen Wendy Gu.<br>M.Eng.
8
Horáček, Kryštof. "Aplikace měřicích sond v procesu frézování na CNC stroji MCV1210." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400954.
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This diploma thesis focuses on the application of measuring probes in the machining process. The main goal of the thesis is to create sample procedures for measuring cycles and functions in a CNC machining process using MCV 1210 and selected measuring software. In the first part of the thesis available methods of machine measurement are outlined with a great emphasis on the description of measurement principles, construction, and measurement signal transmission methods between tool probes and the workpiece. The second part of the thesis deals with the application of measuring probes in the machining of the designed test piece using the Productivity+TM and Sinumerik ShopMill softwares. The work also includes an economic evaluation of the profit of an investment in the mentioned measuring equipment.
9
Bittle, Steven Douglas. "An active piezoelectric probe for precision measurement on a coordinate measuring machine (CMM)." Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/18186.
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10
Martin, Edward C. "Methods of Measuring for Irrigation Scheduling - WHEN." College of Agriculture, University of Arizona (Tucson, AZ), 2014. http://hdl.handle.net/10150/333138.
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Revised; Originally published: 2009<br>6 pp.<br>Proper irrigation management requires that growers assess their irrigation needs by taking measurements of various physical parameters. Some use sophisticated equipment while others use tried and true common sense approaches. Whichever method used, each has merits and limitations. In developing any irrigation management strategy, two questions are common: “When do I irrigate?” and “How much do I apply?” This bulletin deals with the WHEN.
11
Regan, Donough Michael. "Measuring CMB non-Gaussianity as a probe of inflation and cosmic strings." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609806.
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Charles, Steven Knight. "Design and thermal modeling of a non-invasive probe for measuring perfusion by thermodiffusion." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/38275.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.<br>Includes bibliographical references (p. 89-91).<br>This research 1) explores the feasibility of developing a non-invasive probe to precisely quantify microcirculatory blood flow (tissue perfusion), in real time and in absolute units, and 2) presents designs and models of such a probe, along with an evaluation of various design-model combinations. Bowman et al. have developed an invasive thermodiffusion probe that measures tissue perfusion accurately, continuously, and in real time. This method employs a self-heated thermistor placed in perfused tissue. From a knowledge of the power required to heat the thermistor probe to a given temperature, perfusion can be calculated using an analytical or numerical model. Using Bowman's thermodiffusion probe (designed for invasive use) in a non-invasive manner, a perfusion study was performed. The data clearly show the promise of a non-invasive thermodiffusion perfusion probe (designed for non-invasive use), and the design of such a probe was pursued by adapting the invasive technology for a non-invasive probe. Because perfusion is not actually measured but calculated from measured quantities by a model of the probe and perfused tissue, the design of the non-invasive probe occurred hand-in-hand with the development of analytical models.<br>(cont.) The results of the clinical study are presented, as well as two designs together with possible one-dimensional analytical models. Using a finite-difference model of the two probe designs and the underlying perfused tissue, the errors that result from approximating these designs as one-dimensional models have been determined. It is shown that modeling a thin, disk-shaped thermistor probe as a hemisphere of appropriate radius can result in an error in calculated perfusion which is small enough for clinical use.<br>by Steven Knight Charles.<br>S.M.
13
Comas, Caroline Marie. "Assessment of the Measurement Repeatability and Sensitivity of a Noninvasive Blood Perfusion Measuring Probe." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/33991.
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Blood perfusion is the local, non-directional blood flow through tissue. It is measured as the volumetric flow rate of blood through a given volume of tissue. One method that has been developed for measuring blood perfusion is a probe that measures the temperature response of the tissue when a thermal event is applied. From the temperature response, the blood perfusion and contact resistance can be estimated by comparing the experimental response to a predicted response, and employing Gaussian minimization techniques to estimate the blood perfusion and contact resistance. The objective of this research was to assess the measurement repeatability and sensitivity of the blood perfusion probe by testing the probe on phantom tissue, such that the effects of physiologic or pathologic conditions on the blood perfusion could be eliminated. Another objective was to conduct a preliminary in vivo study using rats for the purpose of establishing proper experimental protocols for future testing of the blood perfusion probe. A phantom tissue test stand comprised of porous material and water to simulate tissue and blood, respectively, was constructed for the phantom study. Inlet flow rates into the porous media ranging between 0 cc/min and 30 cc/min were tested. To test the measurement repeatability 7 flow rates (0, 5, 10, 15, 20, 25 and 30 cc/min) were tested on two different days. To test the measurement sensitivity of the probe, flow rates between 0 and 10 cc/min, and 15 and 20 cc/min were tested at intervals of 1 cc/min. From the phantom study it was concluded that the probe displayed good measurement repeatability, as the trend in perfusion as a function of inlet flow rates for both days was found to be the same. It was also found that the data collected using the probe yielded significantly different perfusion estimates for different flow rates, as statistical analyses show that the average perfusion differences between flow rates are truly independent within a 90% confidence interval, for flow differences above 4 cc/min. It was found that for flow rates below 4 cc/min the probe sensitivity was significantly reduced. For the in vivo study it was concluded that the probe can be used to obtain estimates of perfusion from rats. This preliminary study also served to establish proper experimental protocols for future tests.<br>Master of Science
14
Gomide, Reinaldo Lucio. "A transient heat probe sensor for measuring transpiration in the stem of woody plants." Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/184969.
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A compact portable electronic system has been developed for measurement of sap flow through the xylem in the stem of woody plants. This system utilizes a single heated thermistor probe which is alternately and automatically switched between a constant (heating phase) and a variable (cooling phase) temperature mode of operation. Experiments reported here have been carried out in two distinct porous medium, packed bands and the stem of several apple trees. The system performance was tested to detect the variations in flow rate. In both mediums, results indicated that the single heated thermistor is able to work as flowmeter since its transient thermal response was affected by the local fluid flow. The natural logarithm of the fractional response of the thermistor probe indicated that the system can not be analysed as a first order model. Non-linear regression analysis showed that the relationship between the probe sensor temperature response and the time elapsed from the beginning of cooling phase is adequately fitted by an additive exponential model. A dimensionless heat transfer analysis, applied to the thermistor probe, is outlined. Problems encountered in the transient heat transfer analysis are reported.
15
Kulhánek, Jaroslav. "Aplikace měřicích sond v procesu obrábění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228889.
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The object of this work is to apply the measuring probe in the process of the machining and explore the use of the measuring probes. For the practical of the measurement was use measuring probes, the program supplied with the measuring probes, machining centers and the resulting data were evaluated on a PC. Finally, work is to evaluate the measurements and describe the appropriateness of the application.
16
Whiting, James Gerald Holland. "Development and validation of a gastroenterology probe capable of measuring the position of the squamo-columnar junction." Thesis, University of Strathclyde, 2014. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=23200.
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The squamo-columnar junction is an important landmark in the upper gastro-oesophageal anatomy, acid reflux occurring above this causes heartburn and may lead to oesophageal cancer if prolonged. Currently no medical device takes into account the position of the squamo-columnar junction despite its importance. The aim of this doctoral work is to develop and validate a device which is capable of monitoring the position of the squamocolumnar junction with respect to simultaneous acid reflux and pressure measurements. Using Hall effect sensors on a custom flexible circuit board, and a magnet attached to the squamo-columnar junction, a device was produced which when inserted into the oesophagus, measured the relative position of the squamocolumnar junction to manometry and pH-metry catheters. The accuracy of the measurement was at most 5 millimetres, often better; a better resolution than either the high resolution manometer or custom pH device. The device was validated in-vivo, demonstra ting a capability of measuring significant movement of the squamo-columnar junction during transient lower oesophageal sphincter relaxations. The accuracy of the high resolution manometer was tested, which showed significant drift, capable of causing misdiagnosis. A correction algorithm was produced which corrected linear drift, removing time dependant drift leading to significantly more accurate pressure readings. Catheter based upper gastro-oesophageal measurements have the potential to cause transient lower oesophageal sphincter relaxations by triggering mechanoreceptors in the pharynx; therefore a non-catheter based squamo-columnar junction locator was designed and tested. Using a larger magnet and significantly more sensitive Hall effect sensors and custom analogue circuitry, the squamo-columnar junction could be detected. The distance between the oesophagus and the skin is estimated to be between 8 and 9 centimetres for a healthy, non-obese male adult, the detection range for the non-catheter based squamo-columnar junction locator was 10.4 centimetres. The devices developed for this doctoral work has improved the field of gastroenterology research.
17
Rolenc, Martin. "Programové moduly automatického nastavování nástrojů u soustružnických center." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229889.
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Creating of SW modules for setting of lathe tools using no contact laser measuring device This master´s thesis is about possibilities of using touch probes, especially tool probes. Theoretical part of thesis is about principles, which probes use for their function, and about possibillities of application. Practial part is devoted creating sw modules for semiautomatic tool control for NC turning machine
18
Minott, Dutch Henry. "The design and implementation of a point-contact Andreev reflectivity probe for measuring the spin polarization of materials /." Available to subscribers only, 2005. http://proquest.umi.com/pqdweb?did=1079667631&sid=10&Fmt=2&clientId=1509&RQT=309&VName=PQD.
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Pacheco, Arenas Carlos Arturo. "Construction and implementation of a 4-probe measuring system to determinate the temperature dependent sheet resistance of thin films." Master's thesis, Pontificia Universidad Católica del Perú, 2016. http://tesis.pucp.edu.pe/repositorio/handle/123456789/8434.
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In order to build machines, electronic devices, it is necessary to know all properties of the materials.
The machines and electronic devices use parts that are interconnected, the mechanical properties
are important, but for some specific tasks the electrical properties are more important. In this sense
it is necessary to predict the behavior of this parts in different temperatures to the environment.
The present thesis focus on implementation of a 4-probe measuring system to determinate the
sheet resistance of thin film samples showing the dependency of the resistivity on the film thickness
as well as on the deposition temperature. The method used to determine the resistivity is the
modified van der Pauw Method. Therefore, it is important the measurement of the current and the
voltage drop in the sample. It is also important to measure the distance between tips, in order to
calculate the resistivity. Furthermore, it is also important to find the correct transformation that
maps any four point of a plane to a new plane with four collinear points. The measurements are
controlled via LabVIEW and the measured data is displayed in the user interface.<br>Con el fin de construir máquinas, dispositivos electrónicos, es necesario conocer todas las
propiedades de los materiales. Las máquinas y los dispositivos electrónicos utilizan piezas que están
interconectados, las propiedades mecánicas son importantes, pero para algunas tareas específicas
son más importantes las propiedades eléctricas. En este sentido es necesario predecir el
comportamiento de estas piezas a diferentes temperaturas. La presente tesis se centra en la
implementación de un sistema de medición 4-puntas para determinar la resistencia laminar de las
muestras de las láminas delgadas, que demuestran la dependencia de la resistividad respecto al
espesor de la lámina, así como de la temperatura de deposición. El método utilizado para
determinar la resistividad es el van der Pauw modificado. Por lo tanto, es importante la medición
de la corriente y la caída de tensión en la muestra. También es importante la medición de la distancia
entre las puntas, para calcular la resistividad. Sin embargo, también es importante encontrar la
correcta transformación que mapea cuatro puntos de un plano a un nuevo plano con cuatro puntos
en lineados. Para la dependencia de la resistividad de la temperatura se utilizará el método der
Pauw van modificado. Las mediciones se controlan a través de LabVIEW y los datos medidos se
muestran en una interfaz de usuario.<br>Um Maschinen und elektronische Geräte zu bauen ist es notwendig alle Eigenschaften der
Materialien zu kennen. In Maschinen und elektronischen Geräte werden Teile verwendet, welche
miteinander verbunden werden, wobei deren mechanische Eigenschaften wichtig sind, aber für
manche spezifische Aufgaben sind die elektrischen Eigenschaften wichtiger. In diesem
Zusammenhang ist es notwendig vorauszusagen, wie sich das Verhalten dieser Teile bei
verschiedenen Temperaturen zur Umgebung ändert. Die vorliegende Arbeit konzentriert sich auf
die Implementierung eines 4-Punkt-Messsystems zur Bestimmung des Plattenwiderstandes von
dünnen Filmproben sowie der Abhängigkeit des spezifischen Widerstands von der Filmdicke als
auch der Fertigungstemperatur der Probe. Das Verfahren, welches verwendet wird um den
spezifischen Widerstand zu bestimmen, ist die modifizierte van der Pauw Methode. Deshalb ist das
Maß des Stroms und der Spannungsabfall in der Probe wichtig. Es ist noetig, die Entfernung
zwischen den Messpunkten zu bestimmen, um den spezifischen Widerstand zu berechnen.
Desweiteren ist es auch wichtig, die richtige Transformation zu finden, um jeden der vier Punkte
einer Ebene in einer neuen Ebene mit vier Collinearen-Punkten kartografisch darzustellen. Die
Messwerte werden mit Hilfe von LabVIEW ueberwacht, und die Messdaten werden in einer
Benutzeroberflaeche angezeigt.<br>Tesis
20
Curi, Grados Osmar Giordano Adolfo. "Integration of a visual tracking system into a four probe measuring system to evaluate the electrical sheet resistance of thin films." Master's thesis, Pontificia Universidad Católica del Perú, 2017. http://tesis.pucp.edu.pe/repositorio/handle/123456789/8993.
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En los últimos años, las películas delgadas han sido ampliamente estudiadas debido a la
amplia gama de aplicaciones técnicas que presentan, algunas de las cuales están
determinadas por sus propiedades eléctricas tales como la resistividad. Generalmente,
algunas propiedades medidas en la macroescala no siguen siendo válidas cuando el
material es reducido a la nanoescala. Varios estudios demuestran que la resistividad en
películas delgadas depende del espesor de la muestra. Por lo tanto, en la investigación y
producción de películas delgadas para nuevas aplicaciones, es necesario un sistema eficaz
y preciso para medir y caracterizar sus propiedades eléctricas.
Con el fin de superar las limitaciones en la medición de la resistividad en películas
delgadas, el objetivo de esta tesis es la de implementar un sistema de medición de la
resistividad flexible implementado utilizando el software LabVIEW y conformado por
instrumentos de medición Keithley y una cámara digital tipo microscopio. Este sistema
presenta dos características principales:
1. Un sistema de seguimiento automático de posición (visual tracking) para determinar
la ubicación de las puntas de medición sobre la muestra. Este sistema reduce los
errores ocasionados por el desalineamiento de las puntas, proporciona una apropiada
interfaz gráfica y es el primer paso para la automatización del sistema de medición.
2. El sistema es capaz de medir la resistividad utilizando cuatro métodos distintos (Van
der Pauw, Linear Van der Pauw, y el método de las cuatro puntas lineal y cuadrado).
Esta característica proporciona la posibilidad de medir una gama más amplia tanto
de materiales como de dimensiones de las muestras.
El desempeño del sistema desarrollado se válido midiendo muestras estándar de
aluminio y tungsteno de diferentes espesores (100, 300 and 600 nm). Las películas se
depositaron sobre sustrato de silicio mediante sputtering. La resistividad de las películas
se midió aplicando los diferentes cuatro métodos y se obtuvo un error estándar menor a
1%. Con el _n de validar la eficacia del sistema de seguimiento visual (visual tracking),
se analizó la influencia, tanto del desalineamiento como de la distribución de las puntas
en la medición de la resistividad.
Los resultados fueron validados por comparación con datos experimentales de la
literatura y modelos teóricos de películas delgadas (Fuchs-Sondheimer, Mayadas-Shatzke
y combinación de ambos modelos). Los resultados están en correlación con los datos
experimentales y los modelos teóricos. Además, se confirmó la dependencia de la
resistividad con el espesor. Asimismo, se demostró que el incremento de la resistividad
eléctrica podrá explicarse por las contribuciones de los mecanismos de dispersión en los
limites de grano y en la superficie de la película delgada.<br>Tesis
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Guerra, Marcelo Del. "Desenvolvimento de apalpador de contato elétrico (\"touch trigger probe\") para atuação no processo de torneamento." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-12022016-174015/.
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A utilização dos apalpadores acoplados a máquinas CNC se tornou uma realidade muito comum no mundo atual, principalmente devido à diminuição do tempo de preparação e possibilidades de realização de medições na própria máquina-ferramenta. Porém, ainda existem algumas barreiras a se transpor, como por exemplo, a dificuldade de programação, custo relativamente elevado e pouca literatura que trata exclusivamente a respeito da utilização dos apalpadores para medição nas máquinas-ferramentas. Nesse trabalho é realizada uma revisão bibliográfica sobre o uso dos apalpadores em ambiente industrial, discutindo-se as tecnologias utilizadas na geração do sinal de \"trigger\" e é proposto um novo modelo de apalpador de contato elétrico, de baixo custo, desenvolvido especialmente para atender as necessidades de medições em tornos CNC. Os testes em laboratório revelaram que a repetibilidade do protótipo construído foi de 0,003 mm dentro de uma confiabilidade de mais ou menos 3 \'sigma\' ou 99,73%. Concluiu-se que tais características são altamente compatíveis com os requisitos necessários para a maioria dos processos de torneamento.<br>The use of touch trigger probes attached to CNC machines has become a world standard, especially due the reduction of setup time and the ability to promote work piece measurements on machine. However, some barriers like measurement routines programming difficulties, high costs of these equipments and the low number of technical literature about this subject, still need to be transposed. This work presents a review on the applications of touch trigger probes on companies shop floor, discussing the nowadays technologies used to generate the trigger signal. A new touch trigger probe model based on a simple electrical contact is specially developed to provide the measuring characteristics required for Lathes, with the needed characteristics and low cost. The tests of the probe developed in the laboratory shown a repeatability of 0,003 mm (more and less 3 \'sigma\' or 99,73%). Those characteristics are high compatible with the most needs of the industry.
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Kohút, Josef. "Použití měřících sond (nástrojové a obrobkové) pro stroje z produkce TOS KUŘIM." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229879.
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The purpose of this dissertation is to familiarize the reader with basic recognition of machine measuring probes for tools and workpieces. Namely then in area of measurement on CNC machining centers. Both recognition from aspects of principle of function of sensing elements and type of transmition to control system, and recognition from constructional aspects are described here. Further it puts mind on equipment of machine probes (touches etc.) and rules for best selection of this equipment. Next part of this work describes selection of appropriate probes, for universal machines from production of firm TOS Kuřim. Last part deals with testing of designed measuring system for concrete machine from production of firm TOS Kuřim. His typical composition, evaluation of tests results and achieved accuracy is also described here.
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Baird, Patrick James Samuel. "Mathematical modelling of the parameters and errors of a contact probe system and its application to the computer simulation of coordinate measuring machines." Thesis, Brunel University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320548.
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Tai, Wing-ying, and 戴穎盈. "Measuring the stigma-sensitivity of psychotic patients in Hong Kong : the effect of stigma-related stimuli on emotional stroop task and attentional probe task." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/193090.
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Psychological distress aroused by stigma may lead to impairments in attentional functioning because it calls attention to the experience of stigma-related stress. Very few studies have actually considered whether stigma could disrupt attentional functioning by serving as distractors with emotional valence in the schizophrenia spectrum, given that there is a possible dysfunctional affective system in response to processing of emotional information.
This research employed the paradigm of emotional Stroop task and attentional probe task to investigate how stigma impacts on the functioning of selective attention. The primary objective of this current study was to investigate how selective attention, as measured in terms of reaction time and accuracy, can be disturbed by stigma-related stimuli in schizophrenia patients. The secondary objective of this study was to test the assumption that schizophrenic patients with higher sensitivity towards stigmatization will demonstrate higher impairment of selective attention in relation to stigma-related stimuli, since they may display more intense negative emotions than patients with lower sensitivity.
For emotional Stroop task, two categories of stimuli, including stigma-related words (emotional arousing to schizophrenic patients), furniture-related words (neutral stimuli) were shown in different colors and the subjects were instructed to name the color of words as fast and as accurate as possible. For attentional probe task, a stigma-related word was paired up with a furniture-related word in each trial. Participants had to respond as soon as they detect the dot in the position previously occupied by the words. Two groups of participants, healthy controls (N = 40) and patients with schizophrenia-related disorders (N = 40) were compared regarding their performances on emotional Stroop task and attentional probe task. The patients were further split into two groups; high-sensitivity towards stigma (N = 19) and low-sensitivity towards stigma(N = 18),for comparison on various variables, like level of symptoms, depression, medical adherence and awareness of mental disorders.
Based on the group comparison of performance on emotional Stoop task, schizophrenic patients exhibited significant emotional interference with the presentations of stigma-related words when compared with the healthy controls. Although the group comparison of performance on attentional probe task did not provide a significant result, schizophrenic subjects obtained higher difference scores which indicated that they were in general displayed more attentional bias towards stigma-related stimuli as compared to furniture-related stimuli. Both emotional Stroop and attentional probe task results show that schizophrenia patients in high-sensitivity subgroup demonstrated the greatest effect of emotional interference with the presentations of stigma-related words. Level of emotional interference for stigma-related stimuli in schizophrenic patients was moderately correlated with the measure of positive symptoms severity, and patients in high-sensitivity group had a significantly higher mean depressive symptoms score than patients in low-sensitivity group. Such information might help to identify potential risk factors and lead to improved treatment and prevention strategies for psychotic patients.<br>published_or_final_version<br>Psychological Medicine<br>Master<br>Master of Psychological Medicine
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Štorek, Pavel. "Měření fyzikálních veličin na rotujících částech." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233493.
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This work is dedicated to small distance contact-less measurement. Especially the surface detection of the commutator or collector of the electrical machines was described. The probes utilising the induction principle of the distance measurement have been developed. The part of the work described the history of the induction distances sensing in FEEC BUT and the using of the induction principle in the industry small distances sensing nowadays. The paper concretely determines the possibilities of the small distances measurement using mentioned probes. The sensitivity for different materials was investigated and the error of the measurement for different measuring object was investigated, too. The effects, that could affected the measurement error, were described in the work. The contribution of the each effect for the total measuring error was specified. Next part is including the description of the measuring workstation and of the hardware and software. At the end the verification of the measuring principle and measuring workstation is presented. The verification has been made on three different commutator types. The verification results are in the conclusion.
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Nóbrega, Luiz Henrique Melo Silva. "Desenvolvimento de uma estratégia de medição, baseada em nurbs, para determinação do desvio total de perfil (fα) de engrenagens cilíndricas de dentes retos usando MMCs". Universidade Federal da Paraíba, 2016. http://tede.biblioteca.ufpb.br:8080/handle/tede/8961.
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Previous issue date: 2016-05-07<br>For many years the power transmission and movement for gears has been an important technology in the automotive, mechanical and aeronautical industries, justifying the considerable number of research carried out under the quality control of these components. Nowadays, involute profile inspections of cylindrical gears have been carried out using CNC Coordinate Measuring Machines (CMMs) with rotary tables and dedicated measurement software, equipped with contact scanning sensors, Touch Trigger Probes – TTP or non-contact, Laser. However, many companies that manufacture and inspect gears use manual CMMs with point to point sensors, thus being unable to issue the profile deviation report. In respect, the motivation for this research is to develop and validate inspection strategies for determining the Total Profile Deviation (Fα) of spur gears, according to ISO 1328, using of a mathematical tool NURBS (Non-Uniform Rational B-Splines) and CMMs manual. Strategies for changing the NURBS weight parameter wi also were applied to assist in inspection definition procedure, and this is one more degree of freedom. In the first moment, before the execution of experimental procedures, simulations were carried out on a computational system and showed satisfactory results. For the experimental tests, a manual CMM MICRO-HITE 3D model was used with point to point sensor. Simulations and experimental results showed that the NURBS technique contributes to manual CMM application using Touch Trigger Probes in measuring the spur gears involute profile. The experimental results showed the methodology efficacy.<br>Por muitos anos a transmissão de movimento e de potência por engrenagens tem sido uma tecnologia importante nas indústrias automotiva, mecânica e aeronáutica, justificando assim a considerável quantidade de pesquisas realizadas no âmbito do controle de qualidade destes componentes. Atualmente, inspeções dos perfis evolventes de engrenagens cilíndricas vêm sendo realizadas utilizando Máquinas de Medição por Coordenadas (MMCs) CNC com mesas rotativas e softwares de medição dedicados, equipadas com sensores por contato de escaneamento, do tipo Touch Trigger Probe – TTP, ou sem contato, Laser. Porém, muitas empresas que fabricam e inspecionam engrenagens utilizam MMCs manuais com sensores do tipo ponto a ponto, ficando assim impossibilitadas de emitir o relatório de desvio de perfil. Neste sentido, a motivação para esta pesquisa é desenvolver e validar estratégias de inspeção para determinação do Desvio Total de Perfil (Fα) de engrenagens cilíndrica de dentes retos, segundo a norma ISO 1328, fazendo o uso da ferramenta matemática NURBS (Non – Uniform Rational B-Splines) e de MMCs manuais. Estratégias para alteração do parâmetro peso wi das NURBS também serão aplicadas para auxiliar na definição do procedimento de inspeção, sendo este um grau de liberdade a mais do modelo. No primeiro momento, antes da execução dos procedimentos experimentais, simulações foram realizadas em um sistema computacional, e apresentaram resultados satisfatórios. Para os testes experimentais foi utilizada uma MMC manual modelo MICRO-HITE 3D, com sensor do tipo ponto a ponto. Resultados de simulações e experimentais mostraram que a técnica NURBS contribui para aplicação de MMC manual usando sensor Touch Trigger na medição do perfil evolvente de engrenagens cilíndricas de dentes retos. Os resultados experimentais demonstraram a eficácia da metodologia desenvolvida.
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Manseur, Megdouda. "Contribution à l’étude d’un système de biotélémesure intracorporelle par gélule ingérable." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14430/document.
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Cette thèse est une contribution à l’étude d’un système de biotélémesure par gélule ingérable. L’étude concerne les problèmes de télétransmission d’énergie et d’informations entre la gélule ingérable et le système extracorporel de télécommande.Nous exposons des méthodes de conception théoriques et de caractérisation expérimentales du système de télécommande sans fil de la mise sous tension des gélules. Une deuxième partie concerne la conception du système de télétransmission d’énergie et d’informations par induction magnétique, suivi de la réalisation d’un système d’accord automatique par capacité commutée synchrone. La caractérisation d’antennes miniatures a fait l’objet d’une troisième partie dans laquelle nous avons proposé des solutions basées sur des techniques de mesure des paramètres Sij en différentiel.Enfin, nous présentons la conception d’une sonde de champ magnétique destinée à valider les résultats de simulation<br>This thesis is a contribution to study of intracorporeal measure of ingestible capsule. It concerns more specifically the problems of wireless transmission of energy and information between the capsule and ingestible extracorporeal control and monitoring system. Thus we first set of design methods and theoretical characterization of the experimental system of wireless remote power up capsules. A second part was dedicated to wireless transmission of energy and information design through magnetic induction, it led to the creation of an original system of tuning by synchronous switched capacitor. The problem of miniature antennas characterization has been a third party in which we have proposed innovative solutions based on techniques for measuring parameters Sij in differential (or transmission). Finally, we presented in the last part the design and characterization of a magnetic field probe designed to validate the simulation results
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Křížek, Michal. "Návrh metodiky a vytvoření vybraných programových modulů pro nastavování a snímání defektů soustružnických nástrojů pomocí laserového měřícího zařízení." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228137.
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This diploma thesis deals with possibility of a non-contact tool corrections measurement and broken tool detection on CNC lathes. For this purpose was made a methodology for measuring and application in NC program. For testing the program in praxis was used CNC lathe SPM 16 with Sinumerik 840D controller. As measuring equipment was used a laser probe NC4 by Renishaw manufacturer.
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Sagawa, Juliana Keiko. "Sistema automatizado para a medição de desvios de forma e orientação." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/18/18146/tde-13012014-185047/.
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O modo de produção vigente exige cada vez mais rapidez, precisão e eficiência nos processos. Em resposta a essas tendências, constituem-se desafios à área de Metrologia a obtenção de sistemas de medição e algoritmos de avaliação de erros mais precisos; a avaliação de incertezas com precisão; e a execução de medições com rapidez. Neste trabalho apresenta-se um Sistema Automatizado de medição para avaliação dos desvios de forma e orientação de componentes. O sistema é baseado na utilização de um robô industrial com seis graus de liberdade e sensores de deslocamento do tipo LVDT. O emprego de sistemas como o proposto para a avaliação de desvios geométricos está condicionado à utilização de um modelo matemático de separação de erros, uma vez que a acurácia de posicionamento e a repetibilidade dos robôs disponíveis atualmente não são adequadas à medição de grandezas micrométricas. Além da aplicação do modelo de separação de erros, este trabalho inclui a elaboração modelos e rotinas de processamento de dados para a avaliação de desvios geométricos. Sistemas similares desenvolvidos foram aplicados principalmente à medição de desvios de retilineidade, e em alguns casos, circularidade. Neste trabalho, buscou-se ampliar o escopo de aplicações deste tipo de sistema, de forma a abranger não só a avaliação dos desvios de retilineidade, mas também a avaliação dos desvios de planicidade e perpendicularismo. Além disso, o enfoque da pesquisa foi dirigido à avaliação do desempenho do sistema e do modelo de separação de erros, por meio da realização de testes experimentais com três peças distintas e por meio de análise comparativa com sistemas convencionais de medição. Os resultados obtidos comprovaram a eficiência do sistema proposto, que destacou-se também por apresentar boa repetibilidade.<br>The current production system demands fast, efficient and precise processes. In order to address these issues, most of the research efforts in the Metrology area have been focused into the development of faster and more accurate measuring systems as well as into the definition of methods to better evaluate uncertainties in measurement. This work presents an automated system for the evaluation of form and orientation deviations of mechanical components. A six-degree-of-freedom industrial robot and LVDT sensors are used to take the measurements. The implementation of the proposed system depends on the application of a mathematical model for error separation since the accuracy of positioning and repeatability presented by the currently available industrial robots are not suitable for measuring micrometric deviations. Besides the application of the error separation model, this work also includes the development of data processing algorithms for the evaluation of geometrical deviations. Few similar systems to the proposed one were developed and applied mainly for straightness and, in some cases, roundness measurements. This work aimed at broadening the range of applications of this kind of measuring systems, making them suitable for the evaluation of flatness and orthogonality deviations. Additionally, the focus of the research was set to the performance evaluation of the system and the error separation model. In order to do that, experimental tests with three different parts were carried out. The values found were compared to the values of the deviations measured with conventional GD&T practice. The obtained results showed the efficiency of the proposed system, which also presented good repeatability.
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Tvardek, Michal. "Návrh automatizovaného měřicího pracoviště s průmyslovým robotem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230961.
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This master's thesis focuses on the use of the Renishaw's Equator gauging system in cooperation with the industrial robot. The target is to design the robotized workcell which contains these two products. Robot acts as a manipulator for inserting and sorting out the workpieces into the "good" and "bad" pallets according to measured results from the Equator. Equator uses a parallel kinematics and probing system which is normally used on coordinate measuring machines. Therefore there is the introduction to the parallel and serial kinematic structures, to the problems of the coordinate measuring machines in the first part of this thesis. It was made a separation of the probing systems into a few basic categories, description of the typical representatives of these categories and of the other important accessories of the coordinate measuring machines, too. The second part of the thesis contains a description of the Equator gauging system, the industrial robot which I used and their accessories. In this part is mentioned a few examples of measurement automation in industry practice, too. The third part devotes to the design of the robotized workcell and contains all the important requirements for the realization.
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Khadria, Anjul. "Nonlinear optical probes for measuring membrane potential in neurons." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:82cbcee2-33a6-4508-9bde-50468a2796fe.
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<b>Chapter 1:</b> In Chapter 1, I discuss the design and mechanisms of existing optical techniques to measure membrane potential of live cells. I compare the different fluorescence and second harmonic generation- based methodologies developed over the years to test voltage sensitivity of dyes. <b>Chapter 2:</b> I discuss the design, synthesis, and characterization of pyropheophorbide-based push-pull dyes as nonlinear optical probes. I show that the pyropheophorbides have different transition dipole moment for two-photon fluorescence and second harmonic generation in both 2D and 3D. <b>Chapter 3:</b> In this chapter, I investigate the cellular localization of different donor-acceptor porphyrin-based dyes in a multiphoton microscope. The dyes possess the same hydrophobic electron-donor group and porphyrin group but different hydrophilic electron-acceptor groups. The dyes stain different types of cellular organelles depending on the type of hydrophilic headgroups. <b>Chapter 4:</b> Here, I discuss the existing techniques to test voltage-sensitivity of organic dyes. I also discuss the design of a patch-clampâbased setup that I installed in the multiphoton microscope. I test the efficacy of the setup by testing the voltage sensitivity of commercial dyes. I also investigate the voltage sensing efficacy of plasma membrane bound porphyrinbased dyes. <b>Chapter 5:</b> In this chapter, I discuss the design, synthesis, and characterization of a new tricationic porphyrin-based dye, <b>AK-1</b>. I also investigate the plasma membrane localization of <b>AK-1</b> in HEK 293T cells, U-87 MG cells, HeLa cells, rat hippocampal neurons, mice brain slices, contracting neonatal myocytes, gram negative bacteria E.Coli, and giant unilamellar vesicles. I demonstrate the voltage sensitivity of the dye in contracting neonatal myocytes. I also demonstrate multimodal imaging efficacy of <b>AK-1</b>. <b>Chapter 6:</b> In this chapter, I study the spatial characteristics of monocellular and multicellular spheroidal tumor models through two-photon microscopy. The spheroids display similar characteristics to real tumors.
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Hanák, Jiří. "Platforma pro měření atmosférických veličin." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2021. http://www.nusl.cz/ntk/nusl-445581.
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This work is dealing with the design and implementation of an embedded system for aerology measuring. The aim of the system is to monitor atmospheric states during an ascent in the suspension under an meteorological balloon. First of all, attention is given to the Earth's atmosphere and its quantities, then an overview of existing systems for performing aerological measurements. The core of the work is focused on the choice of measurement techniques and the selection of suitable measuring elements for a given scenario. The aerological probe is using atmospheric sensors HIH-8131-021-001, MS5611-01BA03 and PT1000-550 for temperature sensing, while GNSS data is received using the MAX-M8Q-0 module and the measured data is stored on a microSD card and transmitted in parallel using the MTX2-434.650-10 radio module. The system is controlled by STM32L1 from STMicroelectronics programmed in C using HAL abstraction layer.
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Vlček, Michal. "Integrace měření do CNC obrábění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229070.
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This master thesis deals with integration of measuring into process of machining. The object of this work is making summary of using measuring probes, description of the probes working principles and their division by construction and usage. The practical part of this work deals with creation of measuring cycles in softwaru Productivity+ and their implementation to machining cycles in MCV 1210. In the last part, two testing workpieces were created and the economic evaluation of introduction of the probes into machining process was performed.
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Serdula, Claire D. "Testing of fibreoptic probes for measuring the size distribution of large bubbles." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ28869.pdf.
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Fúsek, Jakub. "Měřicí stanice v automatické obráběcí lince." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378870.
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This master thesis deals with the use of measuring stations in an automatic machining lines. An overview of the methods of measuring engineering products in engineering practice with a focus on automation of measurement is described. The basic principles of function of these machines, their construction and materials are described. The largest part describes coordinate measuring machines, which continue to evolve and offer more and more possibilities for automatic measurement. The practical part is aimed at documenting the sample situation of measurements on this type of equipment and evaluating the possibility of its integration into the automatic machining line.
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Rajroop, Peter J. "Fast pulse interactions on a transmission system : a novel EMP measuring technique using new designed loop probes." Thesis, City University London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307875.
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Salas, Casapino Carlos Alberto. "Implementation of a four probes measuring system to determine the resistivity of thin films with temperature dependence." Master's thesis, Pontificia Universidad Católica del Perú, 2017. http://tesis.pucp.edu.pe/repositorio/handle/123456789/8832.
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Resistivity measurements in thin film samples depending on the temperature and on the
lm thickness is always a subject of interest, above all when it comes to new materials.
This work presents the implementation of a measuring system for thin fi lm resistivity
based on four probes showing the dependency of the resistivity on the temperature as
well as on the film thickness. In order to change the temperature of the samples, a heat
source based on a Peltier element was implemented into the measuring system. A
Graphical User Interface using a LabVIEW software controls all the devices of the
measuring system and allows the user to calculate the thin lm resistivity choosing
between four measuring method: Van der Pauw, Modi ed Van der Pauw, Linear Van der
Pauw and Linear Four Probes methods.
Resistivity in aluminum and tungsten thin lm samples with 100, 300, and 600 nm
thickness were measured at temperatures between 303K and 373K with increments of
5 K. The results obtained are higher than bulk resistivity values and agrees with the
present theory. Moreover, it is shown that the resistivity values obtained and its
corresponding temperature coeficients increases as the film thickness decreases.<br>Tesis
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Salas, Casapino Carlos Alberto. "Implementation of a four probes measuring system to determine the resistivity of thin lms with temperature dependence." Master's thesis, Pontificia Universidad Católica del Perú, 2017. http://tesis.pucp.edu.pe/repositorio/handle/123456789/8900.
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Resistivity measurements in thin film samples depending on the temperature and on the
film thickness is always a subject of interest, above all when it comes to new materials.
This work presents the implementation of a measuring system for thin film resistivity
based on four probes showing the dependency of the resistivity on the temperature as
well as on the film thickness. In order to change the temperature of the samples, a heat
source based on a Peltier element was implemented into the measuring system. A
Graphical User Interface using a LabVIEW software controls all the devices of the
measuring system and allows the user to calculate the thin film resistivity choosing
between four measuring method: Van der Pauw, Modified Van der Pauw, Linear Van der
Pauw and Linear Four Probes methods.
Resistivity in aluminum and tungsten thin film samples with 100, 300, and 600 nm
thickness were measured at temperatures between 303K and 373K with increments of
5 K. The results obtained are higher than bulk resistivity values and agrees with the
present theory. Moreover, it is shown that the resistivity values obtained and its
corresponding temperature coefficients increases as the film thickness decreases.<br>Tesis
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Vlček, Michal. "Aplikace měřicích sond v procesu obrábění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229056.
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his master thesis deals with application of measuring probes in machining process. There is indicated a brief overview of the measurement methods used in cutting operation. It is also focused on the measurements of using probes to verify the acceleration and refinement of the production.
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Ferré, Paul Andrew Ty. "Design and analysis of time domain reflectometry probes for measuring water content and bulk electrical conductivity under steady and transient flow conditions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq22200.pdf.
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Volf, Tomáš. "Analýza magnetického pole pomocí MKP a magnetické sondy." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218786.
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The magnetic field analysis by MKP and magnetic probe project deals with magnetic field analysis of asynchronous machine cross section. This analysis is written in detail along with the necessary theory of asynchronous machine and the ANSYS program. The magnetic field of selected machine is measured by magnetic probe and results are compared with calculation. The next part of thesis is draft of device for the magnetic field analysis.
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Prasser, Horst-Michael. "3. Workshop "Meßtechnik für stationäre und transiente Mehrphasenströmungen", 14. Oktober 1999 in Rossendorf." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-30118.
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Am 14. Oktober 1999 wurde in Rossendorf die dritte Veranstaltung in einer Serie von Workshops über Meßtechnik für stationäre und transiente Mehrphasenströmungen durchgeführt. Dieses Jahr kann auf auf 11 interessante Vorträge zurückgeblickt werden. Besonders hervorzuheben sind die beiden Hauptvorträge, die von Herrn Professor Hetsroni aus Haifa und Herrn Dr. Sengpiel aus Karlsruhe gehalten wurden. Erneut lag ein wichtiger Schwerpunkt auf Meßverfahren, die räumliche Verteilungen von Phasenanteilen und Geschwindigkeiten sowie die Größe von Partikeln bzw. Blasen der dispersen Phase zugänglich machen. So wurde über einen dreidimensional arbeitenden Röntgentomographen, ein Verfahren zur Messung von Geschwindigkeitsprofilen mit Gittersensoren und eine Methode zur simultanen Messung von Blasengrößen sowie Feldern von Gas- und Flüssigkeitsgeschwindigkeit mit einer optischen Partikelverfolgungstechnik vorgetragen. Daneben wurden interessante Entwicklungen auf dem Gebiet der lokalen Sonden vorgestellt, wie z.B. eine Elektrodiffusionssonde. Neue meßtechnische Ansätze waren ebenfalls vertreten; hervorzuheben ist der Versuch, die Methode der optischen Tomographie für die Untersuchung von Zweiphasenströmungen nutzbar zu machen. Der Tagungsband enthält die folgenden Beiträge: S. John, R. Wilfer, N. Räbiger, Universität Bremen, Messung hydrodynamischer Parameter in Mehrphasenströmungen bei hohen Dispersphasengehalten mit Hilfe der Elektrodiffusionsmeßtechnik E. Krepper, A. Aszodi, Forschungszentrum Rossendorf, Temperatur- und Dampfgehaltsverteilungen bei Sieden in seitlich beheizten Tanks D. Hoppe, Forschungszentrum Rossendorf, Ein akustisches Resonanzverfahren zur Klassifizierung von Füllständen W. Sengpiel, V. Heinzel, M. Simon, Forschungszentrum Karlsruhe, Messungen der Eigenschaften von kontinuierlicher und disperser Phase in Luft-Wasser-Blasenströmungen R. Eschrich, VDI, Die Probestromentnahme zur Bestimmung der dispersen Phase einer Zweiphasenströmung U. Hampel, TU Dresden, Optische Tomographie O. Borchers, C. Busch, G. Eigenberger, Universität Stuttgart, Analyse der Hydrodynamik in Blasenströmungen mit einer Bildverarbeitungsmethode C. Zippe, Forschungszentrum Rossendorf, Beobachtung der Wechselwirkung von Blasen mit Gittersensoren mit einer Hochgeschwindigkeits-Videokamera H.-M. Prasser, Forschungszentrum Rossendorf, Geschwindigkeits- und Durchflußmessung mit Gittersensoren
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Prasser, Horst-Michael. "3. Workshop "Meßtechnik für stationäre und transiente Mehrphasenströmungen", 14. Oktober 1999 in Rossendorf." Forschungszentrum Rossendorf, 1999. https://hzdr.qucosa.de/id/qucosa%3A21838.
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Am 14. Oktober 1999 wurde in Rossendorf die dritte Veranstaltung in einer Serie von Workshops über Meßtechnik für stationäre und transiente Mehrphasenströmungen durchgeführt. Dieses Jahr kann auf auf 11 interessante Vorträge zurückgeblickt werden. Besonders hervorzuheben sind die beiden Hauptvorträge, die von Herrn Professor Hetsroni aus Haifa und Herrn Dr. Sengpiel aus Karlsruhe gehalten wurden. Erneut lag ein wichtiger Schwerpunkt auf Meßverfahren, die räumliche Verteilungen von Phasenanteilen und Geschwindigkeiten sowie die Größe von Partikeln bzw. Blasen der dispersen Phase zugänglich machen. So wurde über einen dreidimensional arbeitenden Röntgentomographen, ein Verfahren zur Messung von Geschwindigkeitsprofilen mit Gittersensoren und eine Methode zur simultanen Messung von Blasengrößen sowie Feldern von Gas- und Flüssigkeitsgeschwindigkeit mit einer optischen Partikelverfolgungstechnik vorgetragen. Daneben wurden interessante Entwicklungen auf dem Gebiet der lokalen Sonden vorgestellt, wie z.B. eine Elektrodiffusionssonde. Neue meßtechnische Ansätze waren ebenfalls vertreten; hervorzuheben ist der Versuch, die Methode der optischen Tomographie für die Untersuchung von Zweiphasenströmungen nutzbar zu machen. Der Tagungsband enthält die folgenden Beiträge: S. John, R. Wilfer, N. Räbiger, Universität Bremen, Messung hydrodynamischer Parameter in Mehrphasenströmungen bei hohen Dispersphasengehalten mit Hilfe der Elektrodiffusionsmeßtechnik E. Krepper, A. Aszodi, Forschungszentrum Rossendorf, Temperatur- und Dampfgehaltsverteilungen bei Sieden in seitlich beheizten Tanks D. Hoppe, Forschungszentrum Rossendorf, Ein akustisches Resonanzverfahren zur Klassifizierung von Füllständen W. Sengpiel, V. Heinzel, M. Simon, Forschungszentrum Karlsruhe, Messungen der Eigenschaften von kontinuierlicher und disperser Phase in Luft-Wasser-Blasenströmungen R. Eschrich, VDI, Die Probestromentnahme zur Bestimmung der dispersen Phase einer Zweiphasenströmung U. Hampel, TU Dresden, Optische Tomographie O. Borchers, C. Busch, G. Eigenberger, Universität Stuttgart, Analyse der Hydrodynamik in Blasenströmungen mit einer Bildverarbeitungsmethode C. Zippe, Forschungszentrum Rossendorf, Beobachtung der Wechselwirkung von Blasen mit Gittersensoren mit einer Hochgeschwindigkeits-Videokamera H.-M. Prasser, Forschungszentrum Rossendorf, Geschwindigkeits- und Durchflußmessung mit Gittersensoren
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Böhm, Jakub. "Měřicí doteky ve strojírenské metrologii." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-377656.
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This diploma thesis deals with measuring touches problems in industrial metrology. Thesis describes adhesive wear and tear which is caused by measuring probes when dynamical measuring is being concluded. Measuring of damaged component made of silumin and its different changes of texture by different measuring probes are evaluated. Measuring touches are made of titanium nitride, silicon nitride, zirconium, bearing chrome steel, ruby, experimental composite material and nanocrystalline diamond.
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Miah, Khalid Hossian. "Three-dimensional broadband intensity probe for measuring acoustical parameters." 2009. http://hdl.handle.net/2152/6563.
Full textAbstract:
Measuring different acoustical properties have been the key in reducing noise and
improving the sound quality from various sources. In this report, a broadband (200 Hz –
6.5 kHz) three-dimensional seven-microphone intensity probe system is developed to
measure the sound intensity, and total energy density in different acoustical
environments. Limitations of most commercial intensity probes in measuring the three-dimensional
intensity for a broadband sound field was the main motivation in developing
this probe. The finite-difference error and the phase mismatch error which are the two
main errors associated with the intensity measurements are addressed in this report.
As for the physical design, seven microphones were arranged in a two-concentric
arrays with one microphone located at the center of the probe. The outer array is for low-frequencies
(200 Hz – 1.0 kHz), and the inner one is for high-frequencies (1.0 kHz – 6.5
kHz). The screw adjustable center microphone is used for the microphone calibration,
and as the reference microphone of the probe. The simultaneous calibrations of all the microphones in the probe were done in the anechoic room. Theories for the intensity and
the energy densities calculations for the probe were derived from the existing four-microphone
probe configuration. Reflection and diffraction effects on the intensity
measurements due to the presence of the microphones, and the supporting structures were
also investigated in this report. Directivity patterns of the calculated intensity showed the
omnidirectional nature of the probe.
The intensity, and total energy density were calculated and compared with the
ideal values in the anechoic room environment. Characterization of sound fields in a
reverberant enclosed space, and sound source identification are some applications that
were investigated using this probe. Results of different measurements showed
effectiveness of the probe as a tool to measure key acoustical properties in many practical environments.<br>text
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Leidel, Christina Paulette. "Measuring molecular motor forces to probe transport regulation in vivo." 2012. http://hdl.handle.net/2152/20684.
Full textAbstract:
The cell relies on molecular motor proteins for long range transport of vesicles and organelles to maintain the organization required within the cell as it changes over time. Cargos move bidirectionally along microtubules due to the presence of multiple copies of opposite polarity motors. Individual motor properties have been teased out in vitro, but understanding how multiple motors cooperate in vivo has thus far been limited by many obstacles. The goal of this work is to study how multiple similar and dissimilar motors operate together in vivo. Since the function of motors is to generate force to haul cargos, I designed a novel optical trapping system capable of precisely measuring the forces exerted by molecular motors in their native environment, a living cell. Using this system, I find evidence that motors do not fight against each other, supporting the regulation model over the tug-of war model for bidirectional transport. I then study motor regulation in axons in the context of Alzheimer’s disease. I find that GSK-3, a kinase found in abnormal amounts in Alzheimer’s brains, is a negative regulator of transport. I show that GSK-3 regulates motor activity rather than cargo binding. Finally, I also use the optical trap to probe the viscosity of cytosol in vivo and investigate its implications on the cooperation of multiple motors.<br>text
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林信介. "A Study of Laser Probe Alignment for Coordinate Measuring Machine." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/18040259441343239586.
Full textAbstract:
碩士<br>國立中興大學<br>機械工程學系<br>91<br>This paper describes a fast and accurate method for the laser
probe alignment that applied in Coordinate Measuring Machine (CMM) .It makes the laser probe and the touch trigger probe have the samereference coordinate system when applied in our CMM applications at the same time.
The characteristics of the laser probe can be analyzed according to different affecting factors. Then we will get a nonlinear regression equation of characteristics. Furthermore, the free form surface of an object is measured by the aligned laser probe and the results are compared with those touch trigger probe measured.
Keywords: Alignment, Laser probe, Coordinate Measuring Machine, Nonlinear regression
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Chung-HsienLee and 李宗憲. "Development of Langmuir Probe for measuring electron energy distribution function." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/57094249209504411880.
Full textAbstract:
碩士<br>國立成功大學<br>太空天文與電漿科學研究所<br>100<br>Langmuir probe is the most commonly used instrument for measuring the electron temperature and electron density in the ionosphere. The electron energy distribution function is even more important for understanding plasma dynamics. Many probe theories have been developed to determine the electron density and temperature by assuming that electrons have the Maxwellian energy distribution. However, if the electrons have a non-Maxwellian distribution, the measurement results will be misleading. Hence, the goal of this thesis is to improve the Langmuir probe system to measure the electron energy distribution function accurately. We will describe the Langmuir probe system design, electronic circuits, and the experimental results performed at the Space Plasma Operation Chamber of Plasma and Space Science Center, National Cheng Kung University. We also investigate the contamination effect of the probe electrode on the measured voltage-current characteristic curves. We then propose two simple methods to avoid the electrode contamination problem and confirm these methods by experimental results.
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Adelakun, Idris Ademuyiwa. "Design of a Multilevel - TDR Probe for Measuring Soil Water Content." 2012. http://hdl.handle.net/1993/12345.
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ABSTRACT
The TDR measures soil water content by measuring the travel time of an electromagnetic step pulse through a wave guide embedded in the soil. Damage during insertion and retrieval of the probe makes it unsuitable for repeated use. A multilevel-TDR probe with adequate protection for cable was designed and tested to overcome this problem.
Each section of the multilevel-TDR probe was constructed by embedding a 60 mm centre rod and a 63 mm outer loop in grooves on the outer wall of a 200 mm section of PVC pipe. Fifteen such probes were tested in the laboratory and the field by comparing it with the weighing method. Regression analysis between TDR-ϴv and weighing method-ϴv showed good correlation with an R2 of 0.97 and 0.98 during two laboratory experiments and 0.51 during the field experiment. This multilevel probe is cost effective, reusable and can measure soil water content at different depths.
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Liu, Yen-Hui, and 劉彥輝. "Design and Analysis for A High-precision Contact-type Measuring Probe." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/22279313222627586495.
Full textAbstract:
碩士<br>國立高雄第一科技大學<br>機械與自動化工程所<br>95<br>The aim of this thesis is to design a contact type measuring probe based on flexural hinges. The measuring probe using symmetrical double-notched flexure hinges can improve the compliance in the measuring direction for reducing measuring force, and increase the stiffness in the traveling direction for preventing measuring error and for providing high-speed measurement. In the research, the Taguchi Method was used to determine the most suitable set of design parameters based on the finite element method (FEM). The designed measuring probe together with PZT actuators and laser interferometer will be applied to the implementation of a 2D contact-type ultraprecision measuring system in the near future.
The research works on the thesis is based on the bellow-type flexure hinges which features the advantages of high resolution, no need of lubrication, no gap and good dependability to design a contact type measuring probe. The Taguchi Method was used to optimize a contact type measuring probe with the finite element method (FEM). The experimental results show that the contact type measuring probe could be obtained with displacement of 459 nm and stiffness of 20 mN/�慆 due to the pressure 0.01 N. The contact type measuring probe conform to the objective that it has high flexibility and displacement. Finally, the 2D contact-type high-precision measuring system applied the contact type measuring probe to measure the optical lens, and proved the feasibility according to the system of static fundamental characteristics in the future.