Dissertations / Theses on the topic 'Displacement curent sensor'
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Lai, Yuqing. "Eddy current displacement sensor with LTCC technology." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=976297167.
Full textNiemann, Hester Elna. "A high precision driver for an eddy current displacement sensor / by Elna Niemann." Thesis, North-West University, 2009. http://hdl.handle.net/10394/3990.
Full textThesis (M.Ing. (Electrical and Electronic Engineering))--North-West University, Potchefstroom Campus, 2010
Grobler, Andries Johannes. "A low cost eddy current displacement sensor for active magnetic bearings / by Andries J. Grobler." Thesis, North-West University, 2008. http://hdl.handle.net/10394/2627.
Full textThe McTronX research group of the North-West University is involved in active magnetic bearing (AMB) research. An AMB is a mechatronic system that levitates a rotating axis with electromagnetic forces. The group has successfully implemented radial and axial AMBs as well as a complete flywheel energy storage system operating at 22 000 rpm. Research is also done on using the actuator voltage and current to derive rotor position, also known as self-sensing, but these methods have not been perfected. Position measurement is very important in AMBs, since it is the main control variable. The literature indicates that the eddy current phenomenon is well suited for displacement measurement, since it is relatively noise immune and insensitive to process medium when a nonmagnetic and non-conductive substance is used. Printed circuit board (PCB) sensors must be considered when low cost is a requirement. The goal of this project is to design, simulate, manufacture and test a PCB based, low cost eddy current is placement sensor for AMBs. This project will focus on the sensor (probe) that converts the physical rotor movement to an electric signal. An evaluation platform, used to test the PCB sensor, is also designed and manufactured as part of this project. The first step in the sensor design is to establish a suitable software model. A finite element method (FEM) software package, Comsol, is used to realise a FEM model of the sensor. This FEM model is used to simulate sensor behaviour in various configurations. The trends found in the FEM model results are used to compile a design flow diagram. This diagram is illustrated by applying it to single, double- and five-layer designs. The single- and double-layer sensors are manufactured and tested to validate the accuracy of the FEM model and design flow diagram. Close correlation between the practical and predicted results is found for the single- and double layer sensors. The sensitivity and working point rms voltage correlated exceptionally well for both sensors. Linearity does not correlate as closely due to the evaluation platform and circuitry but is still within acceptable limits when compared to other displacement sensors used in AMBs. This project laid the foundation for PCB sensor design in the McTronX group. A comparison between the different sensors showed that the double-layer sensor is the best choice in terms of cost and performance. It is concluded that the PCB displacement sensor presented in this dissertation is a viable low cost option for displacement measurement in AMBs.
Thesis (M.Ing. (Electrical Engineering)--North-West University, Potchefstroom Campus, 2008.
Gunes, Cagdas. "New Imaging Approaches for Process Tomography Based on Capacitive Sensors." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531058286375668.
Full textYang, Yi. "Power line sensor networks for enhancing power line reliability and utilization." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41087.
Full textVirmontois, Cédric. "Analyse des effets des déplacements atomiques induits par l’environnement radiatif spatial sur la conception des imageurs CMOS." Thesis, Toulouse, ISAE, 2012. http://www.theses.fr/2012ESAE0009/document.
Full textToday, space imaging is an essential tool for sustainable development, research and scientific innovation as well as security and defense. Thanks to their good electro-optic performances and low power consumption, CMOS image sensors are serious candidates to equip future space instruments. However, it is important to know and understand the behavior of this imager technology when it faces the space radiation environment which could damage devices performances. Many previous studies have been focused on ionizing effects in CMOS imagers, showing their hardness and several hardening-by-design techniques against such radiations. The conclusions of these works emphasized the need to study non-ionizing effects which have become a major issue in the last generation of CMOS image sensors. Therefore, this research work focuses on non-ionizing effects in CMOS image sensors. These effects, also called displacement damage, are investigated on a large number of CMOS imagers and test structures. These devices are designed using several CMOS processes and using design rule changes in order to observe possible common behaviors in CMOS technology. Similarities have been shown between proton and neutron irradiations using current-voltage characteristics and deep level transient spectroscopy. These results emphasize the relevance of neutron irradiations for an accurate study of the non-ionizing effects. Then, displacement damage induced dark current increase as well as the associated random telegraph signal are measured and modeled. Common evaluation parameters to investigate displacement damage are found, allowing imager behavior prediction in space radiation environment. Finally, specific methods and hardening-by-design techniques to mitigate displacement damage are proposed
Ursule, Marie-Cécile. "Compréhension des mécanismes physiques à l'origine des dégradations électriques extrêmes des pixels dans les capteurs d'images irradiés." Thesis, Toulouse, ISAE, 2017. http://www.theses.fr/2017ESAE0014/document.
Full textImage sensors are used in various space applications: space and earth observations, attitude calculation etc. Those sensors are very sensitive to the space environment whose radiations lead to a degradation of their performances. Among the different impacted parameters, we are interested in the increase of dark current in the pixels. This parasitic current is caused by the thermal generation of charge carriers without any light excitation inducing the increase of the background noise on the images. Some pixels exhibiting the highest degradation are particularly disadvantageous for space missions. They can be critical for some missions and impose to the space community to develop effective prediction methods. ONERA developed an original method to predict dark current induce by the space radiations, based on a Monte Carlo method and the GEANT4 library. The objective of the PhD is to improve the performances of the tool. The approach of this work is first to modify the numerical tool for extreme cases of modelling (i.e. high fluencies or huge pixel volume) for which the Monte Carlo simulations are too long. In order to reduce this computation time, we developed calculation methods using statistical simplifications. In a second part, we studied the influence of the pixel geometry on the dark current. The idea is to follow the degradation cascades created by space particles and to determine if those cascades are contained in the impacted pixel or if they reach neighbor pixels. Finally, we modelled in our tool the physical mechanisms potentially responsible of the highest degradations linked to the electric field, the Poole-Frenkel effect and the phonon assisted tunneling
Le, Roch Alexandre. "Analyse de l’augmentation et de la fluctuation discrète du courant d’obscurité des imageurs CMOS dans les environnements radiatifs spatiaux et nucléaires." Thesis, Toulouse, ISAE, 2020. http://www.theses.fr/2020ESAE0018.
Full textInspired by the microelectronic Complementary Metal Oxide Semiconductor (CMOS) technologies, CMOS image sensors are widely used in many consumer-grade applications and are predominant in the commercial market for embedded cameras. Over the past decade,numerous technological advances allowed state-of-the-art CMOS image sensors to achieve excellent performances as well as low-power consumption. Therefore, CMOS image sensors are becoming essential candidates for a growing number of high-end applications such as space and nuclear applications. However, the behavior of these microelectronic devices inspace and nuclear radiative environments is still under understanding. Hence, studies still investigate the different mechanisms that lead to the degradation of CMOS image sensor performances including the radiation-induced dark current increase, a parasitic signal that increases with radiation doses. Among these radiation doses, the so-called displacement dose,relative to the alteration of the crystalline structure of the silicon, remains poorly studied compared to the so-called ionizing dose. In the latest CMOS image sensor technologies using pinned photodiodes, the ionizing dose is no longer the main degradation mechanism when the displacement dose is at stake. From then on, the displacement dose becomes the principal degradation mechanism that leads to the dark current increase. This work mainly focuses onthe role of the crystalline defects, created by radiation-induced displacement damage, in the CMOS image sensor dark current increase. Particular interest is given to metastable defects,which are probably the cause of discrete and random fluctuations of the dark current called : Dark Current Random Telegraph Signal (DC-RTS). This study presents a double objective :The first aims to contribute to improving knowledge of the physical principles involved in crystalline silicon when facing radiations. Particle-matter interactions, combined with the specific architecture of image sensors, aim to provide reliable tools to analyze the radiation induced defects in silicon. Observations and findings can be extended to all silicon-based devices and more generally to other semiconductor-based devices.The second seeks to identify the different mechanisms leading to CMOS image sensor dark current increase when operating in radiative environments. The study aims to identify and improve knowledge on the behavior of dark current sources aiming to optimize CMOS image sensors for future space and nuclear applications
Zaidi, Houda. "Méthodologies pour la modélisation des couches fines et du déplacement en contrôle non destructif par courants de Foucault : application aux capteurs souples." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00776931.
Full textGuganeswaran, S. "Design and Optimization of Displacement Measurement Eddy Current Sensor for Mass Production." Thesis, 2014. http://etd.iisc.ernet.in/handle/2005/2754.
Full textYung-Chuan, Chuang, and 莊永全. "Development of Eddy-current Displacement Sensor and Research on Multi-degrees Displacement Sensing System." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/99111828454973239013.
Full text國立臺灣大學
機械工程學研究所
90
The aim of this thesis is to develop a reliable and precise eddy-current displacement sensor which can meet the need of general displacement sensing, and use it to establish the multi-degrees displacement sensing system. First of all, the design guidelines of an eddy-current displacement sensor were built up through literature survey and theoretical analysis. The eddy-current sensor consists of two parts — a sensing coil and a sensing circuit. According to the analytical and empirical testing results, the sensing coil is decided to use the wrapping flat coil. On the other hand, an amplitude-modulated circuit and a differential bridge circuit are made as sensing circuits according to different sensing concepts. These two different types of eddy-current displacement sensors are then proceeded different static and dynamic performance testings. Besides, a novel concept of planar coil matrix arrangement based on the modulated sensor is constructed and is tested for proving its adaptability to the multi-degrees displacement sensing system.
Tsou, Yung-Feng, and 鄒永烽. "Development of Miniaturized Eddy Current Displacement Sensor Using MEMS Coil." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/36058715490234999650.
Full text國立高雄第一科技大學
系統資訊與控制研究所
98
In this thesis, an eddy current displacement sensor consisted of stacked coil with a block width of 1 mm is developed by MEMS (Micro-Electro-Mechanical System) technology. The features of coil are small volume, heat resistance and moisture resistance. The performances of developed sensor are verified through experimental results. The sensor coils are formed by four basic patterns, which are made of LTCC (Low Temperature Co–fired Ceramics). The shape of basic pattern is like a three quarters circle, and four basic patterns are combined together to form a spiral structure. A coaxial cable is used to connect the basic patterns, and the sensor head consisting of spiral coils is installed into an experimental fixture. The sensor head is excited by a 5 MHz oscillation signal generated by a quartz resonator. A special circuit is implemented to detect the variation of coil impedance, and then converted into voltage signal. The accuracy of the eddy current displacement sensor is ± 0.1 μm in a measuring range of 100 μm. In addition, for further sensor design, a study is performed for demonstrating the effects of coil patterns to the quality factor by simulation method. This eddy current displacement sensor developed in this thesis can be used for detecting the thickness of lubricant in rotating machinery operated in liquid environment.
Yu, Sheng-Fong, and 余昇峰. "Design and Characterization of Highly-Linear Eddy-Current Displacement Sensor." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/58790959698698990197.
Full text國立高雄應用科技大學
機械與精密工程研究所
98
In this study , the design of the highly linear eddy-current displacement detector is investigated. The sensor head is a LC resonating circuit consists of a ferrite-cored wire-wound inductor and a ceramic capacitor. The driving circuit is an ac impedance measurement circuit constructed from several elements, including crystal oscillator, analog mixer, etc. According to the fitting results of theoretical and experimental resonance curves, the distance of conducting target affects both the inductance and the parasitic resistance of the sensor. For the reducing target distance, the change in inductance alters the resonance frequency, which results in the change in impedance of LC circuit under the fixed excitation frequency. The linearity of the sensor can be optimized by tuning the capacitance in parallel. The developed sensor is capable of dynamic measurement of the distance for conducting and magnetic targets, which is important for automation and motion control applications.
Lai, Yuqing [Verfasser]. "Eddy current displacement sensor with LTCC technology / vorgelegt von Yuqing Lai." 2005. http://d-nb.info/976297167/34.
Full textCHUANG, GUANG-YU, and 莊冠諭. "Circuit Design for Eddy Current and Capacitance Displacement Sensor with Bluetooth Transmission." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/hsdr66.
Full text國立臺北科技大學
機械工程系機電整合碩士班
107
This research aims to develop and design a simple low-power, low-cost eddy current and capacitance displacement sensor circuit. The main features are small size, high precision, low cost, and the combination of processing circuit and probe. It is divided into three parts. The first part is to explore the design and verification of the circuit, to detect the system power consumption or leakage current through the circuit of the smart parking system (PKS), and to plan a complete inspection process architecture, which will be provided to the laboratory designers. Second part, a capacitance sensor. Using the principle of parallel plate capacitance to design a low-cost, small-sized sensor, and accurately calculate the electrode area of the probe and guardring size through the capacitance formula. The third part is the eddy current displacement sensor, which uses the principle of eddy current and electromagnetic induction, is composed of an excitation coil and a conductive object, and the measuring coil is fabricated by using a PCB(Print circuit board) technology. The concept of small size and low cost is realized. Both of the objectives are applied to the CNC(Computer numerical control) to measure the displacement error of the cutting and various components to realize the application of the future intelligent tool machine.
Lin, ShengDe, and 林昇德. "Rotating Machinery Vibration Signal Measurement And Fault Diagnosis Using Eddy Current Displacement Sensor." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/79428998210085762986.
Full text正修科技大學
電機工程研究所
100
For normal operation of the rotating machinery system, detecting and preventing the incipient faults of the machinery is an important task, especially in the production lines of the high-technology industry. If the incipient fault cannot be detected in its early stage, then it will lead to the serious faults. The close coupling of the machinery leads to the cause of its vibration faults more diverse and complicated; however, the vibration status is still a vital indicator for identifying whether the machinery operates normally or not. Therefore, rotating machines’ vibration monitoring and fault diagnosis method is not only significant in productivity and economic benefits of high-technology industry, but also an important research topic in the field of electrical engineering. Vibration faults of rotating machinery are with diverse characteristics. Although the traditional error back-propagation neural network can be used to diagnose the vibration faults, it is with a long training time and its parameters are difficult to be determined. Therefore, to solve the vibration signal measurement and fault diagnosis of rotating ma-chinery, this study first used the eddy current displacement to measure vibration signals, then the Particle Swarm Optimization (PSO) tuned Radial Basis Function Neural Net-work (RBFNN) model diagnosed the vibration faults. This study has proposed PSO to adjust the parameter of the RBFNN, and model performances of the optimal diagnosis model obtained were compared with those of the traditional neural networks. Test results have shown that the proposed methods are with less model constructing time and higher diagnosis accuracy than those of the traditional methods. Therefore, this study has con-firmed the feasibility of the proposed approach to practical system applications. Keywords: Radial Basis Function Neural Network (RBFNN), Particle Swarm Optimiza-tion (PSO) Algorithm, Fault diagnosis.