Relevant bibliographies by topics / Capacitive Sensor Modeling

Academic literature on the topic 'Capacitive Sensor Modeling'

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Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Capacitive Sensor Modeling"

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Murugarajan, A., and G. Samuel. "Measurement, Modeling and Evaluation of Surface Parameter Using Capacitive-Sensor-Based Measurement System." Metrology and Measurement Systems 18, no. 3 (January 1, 2011): 403–18. http://dx.doi.org/10.2478/v10178-011-0007-9.

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Measurement, Modeling and Evaluation of Surface Parameter Using Capacitive-Sensor-Based Measurement System Surface roughness parameter prediction and evaluation are important factors in determining the satisfactory performance of machined surfaces in many fields. The recent trend towards the measurement and evaluation of surface roughness has led to renewed interest in the use of newly developed non-contact sensors. In the present work, an attempt has been made to measure the surface roughness parameter of different machined surfaces using a high sensitivity capacitive sensor. A capacitive response model is proposed to predict theoretical average capacitive surface roughness and compare it with the capacitive sensor measurement results. The measurements were carried out for 18 specimens using the proposed capacitive-sensor-based non-contact measurement setup. The results show that surface roughness values measured using a sensor well agree with the model output. For ground and milled surfaces, the correlation coefficients obtained are high, while for the surfaces generated by shaping, the correlation coefficient is low. It is observed that the sensor can effectively assess the fine and moderate rough-machined surfaces compared to rough surfaces generated by a shaping process. Furthermore, a linear regression model is proposed to predict the surface roughness from the measured average capacitive roughness. It can be further used in on-machine measurement, on-line monitoring and control of surface roughness in the machine tool environment.
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Bereznychenko, V. O., and O. Ye Pidchibii. "ANALYSIS OF THE TECHNOLOGICAL FACTORS INFLUENCE ON RESPONSE FUNCTION OF THE COPLANAR CAPACITIVE SHAFT BEATING SENSOR." Praci Institutu elektrodinamiki Nacionalanoi akademii nauk Ukraini 2021, no. 59 (September 20, 2021): 93–98. http://dx.doi.org/10.15407/publishing2021.59.093.

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In the paper presents results of analysis of the influence of the thickness of the dielectric substrate of a capacitive beating sensor, the electrodes of which are made of foil dielectric type FR4, on the transformation function of the sensor by methods of computer modeling are presented. The results of research by methods of computer modeling of the influence of the thickness of the dielectric substrate of a capacitive beating sensor, the electrodes of which are made of foil dielectric type FR4, on the transformation function of the sensor are presented. The studies were performed in the measurement range of the sensor with a change in the thickness of the dielectric selected from a standard line of material sizes. A comparative analysis method for manufacturing capacitive sensors using PCB technology was done. As a result of the analysis, the dependences of the influence of the thickness of the dielectric substrate on the conversion function of the capacitive sensor are obtained. Bibl. 20, fig. 2, table.
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Gh. Elkilany, Basma, and Elsayed A. Sallam. "Modeling and Analysis of a Novel Flexible Capacitive-Based Tactile Sensor." Applied Mechanics and Materials 789-790 (September 2015): 571–76. http://dx.doi.org/10.4028/www.scientific.net/amm.789-790.571.

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In recent years, autonomous robots have been increasingly deployed in unstructured and unknown environments. In order to survive in theses environments, robots are equipped with sensors. One of the main sensors is tactile sensor which provides the robots with tactile information like texture, stiffness, temperature, vibration and normal and shear forces. In this paper, we propose a flexible capacitive tactile sensor which is designed for measuring both normal and shear forces. The tactile sensing unit consists of five layers, a bottom layer of Polyethylene Terephthalate (PET) with a pillar, two copper electrodes embedded into a Polydimethylsiloxane (PDMS) film, a spacer, a Polyimide (PI) film and finally a top PI bump. The bump and the pillar structure play a significant role in producing a torque for shear force measurement. Finite element modeling (FEM) is conducted to analyze the deformation of the sensing unit and simulated using COMSOL Multiphysics. The change of capacitance verse normal and shear forces are obtained, a comparison between the proposed sensor and other pervious sensor is conducted. The sensitivity of a cell is 0.22%/N within the full scale range of 10 N for normal force and 4%/N within the full scale range of 10 N for shear force.
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Bereznychenko, V. O. "DEFINITION OF THE SHAFTS RADIAL BEATING CAPACITIVE SENSOR RESPONSE FUNCTION BY COMPUTER MODELING." Praci Institutu elektrodinamiki Nacionalanoi akademii nauk Ukraini 2021, no. 58 (May 19, 2021): 107–12. http://dx.doi.org/10.15407/publishing2021.58.107.

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The paper presents the results study the characteristics of capacitive beating sensors to optimize them by computer simulation tools using. A concentric capacitive sensor with high-potential and grounded electrodes was studied. In the course of the research, the expediency of using computer modeling tools by finite element analysis methods to study the metrological characteristics of sensors was shown. It is shown that the application of modeling makes it possible to reduce the time spent on studies of the transformation function and metrological characteristics. The picture of the distribution of equipotential lines of an electric field in a working backlash of the sensor has resulted. The simulation results make it possible to create a picture of equipotential lines by changing the distance between the total surface of the sensor electrodes and the grounded surface, simulating the surface of the shaft. The results of the definition of the response function are given. References 23, figures 5.
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Mika, Michał, Mirjam Dannert, Felix Mett, Harry Weber, Wolfgang Mathis, and Udo Nackenhorst. "Electrostatic sensor modeling for torque measurements." Advances in Radio Science 15 (September 21, 2017): 55–60. http://dx.doi.org/10.5194/ars-15-55-2017.

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Abstract. Torque load measurements play an important part in various engineering applications, as for automotive industry, in which the drive torque of a motor has to be determined. A widely used measuring method are strain gauges. A thin flexible foil, which supports a metallic pattern, is glued to the surface of the object the torque is being applied to. In case of a deformation due to the torque load, the change in the electrical resistance is measured. With the combination of constitutive equations the applied torque load is determined by the change of electrical resistance. The creep of the glue and the foil material, together with the temperature and humidity dependence, may become an obstacle for some applications Kapralov and Fesenko (1984). Thus, there have been optical and magnetical, as well as capacitive sensors introduced). This paper discusses the general idea behind an electrostatic capacitive sensor based on a simple draft of an exemplary measurement setup. For better understanding an own electrostatical, geometrical and mechanical model of this setup has been developed.
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Farhan Affendi bin Yunos, Muhammad, Anis Nurashikin Nordin, Anwar Zainuddin, and Sheroz Khan. "Modeling and development of radio frequency planar interdigital electrode sensors." Bulletin of Electrical Engineering and Informatics 8, no. 3 (September 1, 2019): 985–93. http://dx.doi.org/10.11591/eei.v8i3.1513.

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The interdigital sensor has been implemented in various field of applications such as microwave device, chemical sensor and biological sensor. This work describes the design and fabrication of an interdigital sensor (IDS) design that has the potential of estimating blood glucose levels using capacitive measurements. The IDS was first designed using theoretical equations and later was optimized by using CST Microwave Studio®. The electrode widths of the sensor were varied from 0.5mm to 0.7mm and the S11 reflection characteristics were simulated.Upon completion of simulations, the sensor was fabricated using copper clad FR4 boards. The fabricated sensors were measured using a vector network analyzer (VNA) and produced resonance frequencies of 2.02, 2.11 and 2.14 GHz. The highest Q obtained was 11.72 from the 2.11 GHz sensor.
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Scher, Aaron D. "A simple capacitive proximity sensor experiment for exploring the effects of body capacitance and earth ground." International Journal of Electrical Engineering & Education 55, no. 4 (September 30, 2018): 367–77. http://dx.doi.org/10.1177/0020720918775040.

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Capacitive proximity sensors are well-suited for educational projects due to their low cost and simple design. Traditional undergraduate textbooks and lab exercises rarely highlight the fact that the performance of capacitive proximity sensors can be quite sensitive to ground loading. This paper presents a simple classroom demonstration for exploring this topic in detail. The capacitive proximity sensor for this demonstration is a hand-held LCR meter connected to a homemade capacitor composed of two strips of aluminum foil. Students explore the operation of this sensor for two different system ground configurations. In the first case the LCR meter is battery powered (floating ground referenced) and in the second case the LCR meter is powered by AC mains supply (earth ground referenced). When a student positions their hand near the foil strips, the battery-powered sensor measures an increase in capacitance. Conversely, the AC-mains-powered sensor measures a decrease in capacitance. The instructor guides students to discover for themselves the reason for this seemingly puzzling difference by modeling parasitic capacitance and ground loading using simple circuit models.
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Luo, Bing, Tingting Wang, Fuzeng Zhang, Yibin Lin, Chaozhi Zheng, and She Chen. "Interdigital Capacitive Sensor for Cable Insulation Defect Detection: Three-Dimensional Modeling, Design, and Experimental Test." Journal of Sensors 2021 (March 31, 2021): 1–10. http://dx.doi.org/10.1155/2021/8859742.

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Due to excellent electrical and mechanical properties, cross-linked polyethylene (XLPE) cables are widely used in power systems. Poor manufacturing techniques in the production and installation of cable joints will cause insulation defects. The interdigital capacitive (IDC) sensor has advantages of simple structure and non-contact with the center conductor and shows great potential for online monitoring on XLPE cables. This paper focuses on the 3D modeling of a fully covered IDC sensor for cable insulation detection. Firstly, a 3D finite element model of the sensor is built, and the electric field distributions are compared with those of the partially covered sensor. For the sensor with more electrode pairs, the sensitivity increases with the sensor length and tends to saturate at the length of 5 cm, while the sensitivity remains constant for the sensor with fewer electrode pairs. Then, the differences between 3D and 2D results are discussed and the sensor parameters are optimized to reduce the influence of the fringe capacitance. The simulation results indicate that air gaps between the sensor and XLPE cable are the main reason of the difference between simulation and experiment. When the electrode width is equal to the gap width, the effects of both the fringing electric field and air gaps are relatively small. Finally, several types of sensors are made and used to detect the cable joint with and without the stress cone dislocation under different excitation voltage frequency. The results show that the measured capacitance decreases with frequency and the capacitance of the cable joint with the defects is smaller than that of the normal cable joint.
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Bereznychenko, V. O., and I. O. Zaitsev. "CONTACTLESS CAPACITIVE SENSOR OF THE SYSTEM FOR MONITORING THE PARAMETERS OF THE BEATING OF THE POWERFUL ELECTRICAL MACHINES SHAFTS." Praci elektrodinamiki Nacionalanoi akademii nauk Ukraini Institutu 2020, no. 57 (December 2, 2020): 81–88. http://dx.doi.org/10.15407/publishing2020.57.081.

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In this paper presents the results of the definition the need to use a Kelvin guard ring to reduce the impact of external fields and non-uniformity of equipotential lines to change response characteristic of the capacitive sensor with a central high-potential electrode and a Kelvin guard ring. Measuring transducer placing in the immediate vicinity of the electrodes of the sensor, which eliminates the need to use a triaxial cable, was proposed. The sensor is designed to measure powerful generators shafts cylindrical surfaces parameters run-out. Capacitive sensor response characteristic function which depending on distance between the general plane of electrodes of the sensor and the grounded surface of a shaft is determined analytically and by computer simulation methods. The expediency of using computer modeling tools by finite element analysis methods for studying the metrological characteristics of sensors was shown. References 21, figures 4, table 1.
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Hosni, Mohammed, Ayman Mokhtar, and Samy Ghoniemy. "Modeling and Simulation of Capacitive Gravitational Accelerometer Based Tilt Sensor." Journal of Engineering Science and Military Technologies 17, no. 17 (April 1, 2017): 1–9. http://dx.doi.org/10.21608/ejmtc.2017.21277.

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Dissertations / Theses on the topic "Capacitive Sensor Modeling"

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Xia, Xinggao. "Modeling A Microfluidic Capacitive Sensor for Metal Wear Debris Detection in Lubrication Oil." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1256763475.

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Bach, Thomas William. "Design, modelling and applications of capacitive sensor arrays." Thesis, University of Sussex, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436252.

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Van, der Merwe S. "Modelling and performance evaluation of a three-phase capacitive voltage sensor topology." Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/2032.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2006.
This research project investigates the design, modelling and application of an open-air capacitive voltage sensor assembly for the measurement of wideband High Voltage signals on three-phase transmission lines. The advantages and disadvantages of conventional methods used to measure these voltages are reviewed and the advantages of the open-air capacitive sensor are established. The main research objective of this project involves extending the application of previously developed single-phase capacitive sensor topologies to three-phase applications. A three-phase set of mobile, compact and relatively inexpensive capacitive voltage sensors for open-air application under overhead transmission lines are designed and constructed, including a data acquisition triggering system for the measurement of transient waveforms. Equivalent circuit models, using a Thévenin equivalent approach, are developed for the three-phase sensor topology and the associated three-phase transmission line configuration. A number of different methods for simplifying the associated Thévenin equivalent impedance and voltage equations are evaluated. The decoupling of the voltage waveforms measured by the individual sensors for a three-phase transmission line configuration is subsequently examined with the view to derive mathematical relationships for determining the phase conductor voltages from the measured sensor voltages. The performance of the sensor assembly is experimentally evaluated under laboratory conditions as well as field conditions. An outdoor HV test facility, representing a scaled three-phase flat transmission line structure, is developed for evaluation of the three-phase sensor topology in a controlled environment. The methodology for decoupling the phase voltages and reconstructing the phase conductor voltages from the voltages induced on the sensors is evaluated using measured data obtained with this HV test facility. It is shown that the three-phase capacitive voltage sensor topology as applied in the test facility delivers good results for the measurement of three-phase transient voltage waveforms.
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Schilder, Melanie. "Wideband modelling of capacitive voltage sensors for open-air transmission line applications." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/53222.

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Thesis (PhD)--University of Stellenbosch, 2002.
ENGLISH ABSTRACT: This dissertation considers the wideband modelling of capacitive voltage sensors for open-air transmission line applications. Two novel topologies were introduced, namely a differential parallel plate sensor with a floating faraday cage for the interface instrumentation and a coaxial sensor mounted around the earth conductor with a faraday cage connected to the earth conductor. The modelling and analysis procedures included the derivation of equivalent circuit models in order to simulate the calibration factor, the loading effect of the interface instrumentation and the effect of leakage to ground, both in the time- and frequency domain. In order to obtain a flat frequency response from very low frequencies (less than 5 Hz) to very high frequencies (several MHz) it is important that the interface instrumentation have a high input impedance and galvanic isolation be maintained. This was achieved by developing interface instrumentation with a fibre-optic link operated from battery power. The instrumentation represents a fairly unique approach in that the data is digitised before transmission across the serial fibre-optical link, where-as conventional interfaces use analogue optical technology. Despite the added complexity and high power requirements introduced by the digitising process, the improved versatility is expected to yield a superior interface solution. The instrumentation has a bandwidth of approximately 6 MHz, with an optional anti-aliasing filter at 1 MHz. Special consideration should be given to the support structure as any unbalanced leakage to ground will introduce variations in the frequency response towards the low-frequency end. Leakage of a 100 MQ was found to influence the frequency response of the circuit up to frequencies of 1 kHz. Extensive simulation studies were conducted to obtain qualitative and quantitative insight into the differential sensor topology and the associated electric fields. The improvement of a differential plate sensor over the traditional single element plate sensor was demonstrated using twodimensional simulations. Further simulations with a three-dimensional package showed that the two-dimensional simulations are insufficient, because the boundary conditions and end effects have a great influence on the calibration factor of the sensor. Extensive laboratory tests were also undertaken to evaluate the sensor topology as well as the effects of the interface instrumentation and leakage to ground. Excellent correlation were found between the measured and simulated waveforms, both in the time- and frequency domains regarding the calibration factor as well as the added poles or zeros at low frequencies. It can therefore be deduced that a valid circuit model was suggested for these sensor topologies in the frequency range from 10 Hz to 1 MHz. Keywords: Capacitive sensors, Open-air voltage sensors
AFRIKAANSE OPSOMMING: Hierdie verhandeling beskou die wyeband modellering van kapasitiewe spanningsensors vir opelug transmissie lyn toepassings. Twee oorspronklike topologieë is voorgestel, naamlik 'n differensiële parallel plaat sensor met 'n aparte faraday hok vir die koppelvlak instrumentasie en 'n koaksiale sensor wat rondom die aardgeleier monteer word met die faraday hok ook aan die aardgeleier gekoppel. Die modellerings en analise prosedures het ingesluit die afleiding van ekwivalente stroombaanmodelle vir simulasie van die kalibrasiefaktor asook die belasingseffek van die koppelvlak instrumentasie en lekweerstand na grond in beide die tyd- en frekwensie gebiede. Om 'n plat frekwensieweergawe te verkry vanaf baie lae frekwensies (laer as 5 Hz) tot by baie hoë frekwensies Cn paar MHz), is dit belangrik dat die koppelvlak instrumentasie 'n hoë intreeimpedansie het en galvaniese isolasie verseker word. Dit was bereik deur koppelvlak instrumentasie te ontwikkel met 'n optiese vesel koppeling wat met battery krag aangedryf word. Die instrumentasie verskaf 'n redelik unieke aanslag in die opsig dat die data gemonster word voordat dit oor die seriële optiese vesel skakel gestuur word, terwyl konvensionele koppelvlakke analoog optiese tegnologie gebruik. Ten spyte van die toegevoegde kompleksiteit en hoë drywingsvereistes van die versyferingsproses, het die instrumentasie se veelsydigheid toegeneem tot die mate dat dit as 'n beter koppelvlak oplossing beskou word. Die instrumentasie het 'n bandwydte van ongeveer 6 MHz, met 'n opsionele teen-vou filter by 1 MHz. Die ondersteuningstruktuur is van besondere belang aangesien enige ongebalanseerde lekweerstand na grond afwykings in die frekwensieweergawe sal veroorsaak aan die lae frekwensie kant. Lekweerstand van 100 MQ sal die frekwensieweergawe beïvloed tot by ongeveer 1 kHz. Uitgebreide simulasies is gedoen om kwalitatiewe en kwantitatiewe insig in die differensiële sensor topologie en die geassosieerde elektriese velde te verkry. Die verbetering van 'n differensiële parallel plaat sensor in vergelyking met die tradisionele enkel element plaat sensor is demonstreer met twee-dimensionele simulasies. Verdere simulasies met 'n drie-dimensionele pakket het gewys dat die twee- dimensionele simulasies onvoldoende is aangesien grensvoorwaardes en randeffekte 'n groot invloed het op die kalibrasiefaktor van die sensor. Uitgebreide laboratorium toetse is ook gedoen om die sensor topologie sowel as die effekte van die koppelvlak instrumentasie en lekweerstand na grond te evalueer. Uitstekende korrelasie is gevind tussen gemete en voorspelde golfvorms, in beide die tyd- en frekwensie gebied met betrekking tot die kalibrasie faktor sowel as die toegevoegde pole en zeros by lae frekwensies. Die gevolgtrekking is dus dat 'n geldige stroombaanmodel voorgestel is vir die sensor topologieë vir die frekwensie bereik van 10Hz to 1 MHz. Sleutelwoorde: Kapasitiewe sensors, Ope-lug spanningsensors
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Liu, Ting-Hung. "Testing and Packaging for MEMS Acoustic Emission Sensors." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7692.

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The goal of this research is to improve the structure and dimension of the MEMS acoustic emission sensor. Acoustic emission sensor (AE sensor) based on the piezoelectric transducer is a well-developed technology in non-destructive testing that is widely used to determine permanent damage such as cracks and corrosions in buildings and structures. The AE sensor can be used to monitor cracks in structures and to check leakage in pressurized systems. The location of cracks in a structure or system leakage causes a high-frequency surface vibration while releasing ultrasonic energy. The frequency of this energy is typically between 30 kHz to 1MHz. The AE sensor can detect this high frequency transient acoustic wave. By using this AE sensor, the structure and pressurized system can be monitored to generate an evaluation report in order to facilitate maintenance and structure repair. Currently, the commercial AE sensor is bulky because it is made of a piezoelectric transducer. It also needs a lot of wires to connect with the pre-amplifier and signal conditioning systems. Because of the cost, brittleness and the volume of the commercial AE sensor, new affordable AE sensor technology is desired to replace the commercial AE sensor. The new AE sensor should be economical, small, and lightweight. The performance of the output signal should be comparable with the commercial AE sensor in terms of signal strength and signal to noise ratio. The MEMS AE sensors provide the potential solution to this problem. The MEMS AE sensors can overcome the problems of the commercial AE sensor. The MEMS AE sensor combines the pre- amplifier on the chip in a single package. Through the MEMS technology, the AE sensor can be manufactured in mass quantity and high quality. This study focuses on simulating and measuring the performance of the MEMS acoustic emission sensors. Through simulation, the capacitance value is influenced by the gap between the suspended membrane (top perforated metal plate), metal ground, and also influenced by the effective area of the perforated top layer. The perforation is introduced to reduce the squeeze film damping effect. Through measurement verification, the MEMS AE sensors have exhibited comparable performance before and after inclusion of the 3D printed package that serves as the housing for the completed sensor assembly. The C-V measurement is the key method to extract the capacitance value, which is the key parameter to determine the signal strength and signal to noise ratio for capacitive MEMS acoustic emission sensors. The damping coefficient is also the key factor to receive the time domain measurement data in a fashion that resemble the bulky commercial piezoelectric AE transducers.
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Avila, Gomez Adrian Enrique. "Development MEMS Acoustic Emission Sensors." Scholar Commons, 2017. https://scholarcommons.usf.edu/etd/7392.

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The purpose of this research is to develop MEMS based acoustic emission sensors for structural health monitoring. Acoustic emission (AE) is a well-established nondestructive testing technique that is typically used to monitor for fatigue cracks in structures, leaks in pressurized systems, damages in composite materials or impacts. This technology can offer a precise evaluation of structural conditions and allow identification of imminent failures or minor failures that can be addressed by planned maintenances routines. AE causes a burst of ultrasonic energy that is measured as high frequency surface vibrations (30 kHz to 1 MHz) generated by transient elastic waves that are typically emitted from growing cracks at the interior of the structure. The AE sensor marketplace is currently dominated by bulky and expensive piezoelectric transducers that are wired to massive multichannel data acquisition systems. These systems are complex to operate with the need of signal conditioning units and near proximity pre-amplifiers for each sensor that demands a fairly complicated wiring requirements. Furthermore, due to the high prices of conventional AE sensors and associated instrumentation, and the current requirements in sensor volumes for smart transportation infrastructure, it is undeniable that new AE technology is required for affordable structural health monitoring. The new AE technology must deliver comparable performance at one or two orders of magnitude lower cost, size and weight. MEMS acoustic emission (AE) sensors technology has the potential to resolve several of these traditional sensor’s shortcomings with the advantage of possible integration of on-chip preamplifier while allowing substantially cost reduction due to the batch processing nature of MEMS technology. This study will focus on filling some of the major existing gaps between current developments in MEMS acoustic emission sensors and commercial piezoelectric sensors, such as sensor size, signal-to-noise ratio (SNR), cost and the possibility to conform to sharply curved surfaces. Basically, it is proposed to develop a new class of micro-machined AE sensors or sensor arrays through strategic design of capacitive and piezoelectric MEMS sensors, which will focus on optimizing the following performance aspects: Creating geometric designs to manipulate the sensor resonant frequency and to optimize Q factor under atmospheric pressure and ambient environment. Developing a strategic selection of materials according to its acoustic impedance as insulator, structure and backing material. Developing strategies to improve the signal to noise ratio SNR with and without integrated amplification/signal processing. Performing a comparison between MEMS and commercial piezoelectric sensors.
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Weber, Christian. "Entwicklung eines Verfahrens zur Anhaftungserkennung und Trennung von Einflussgrößen bei kapazitiven Näherungsschaltern mit Hilfe der Impedanzspektroskopie." Universitätsverlag der Technischen Universität Chemnitz, 2017. https://monarch.qucosa.de/id/qucosa%3A23485.

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Kapazitive Sensoren, insbesondere kapazitive Näherungsschalter, werden aufgrund ihrer Fähigkeit nahezu beliebige Materialien detektieren zu können bereits seit vielen Jahrzehnten in unterschiedlichsten Applikationen der industriellen Messtechnik eingesetzt. Aufgrund ihrer kompakten Bauform, ihrer hohen Robustheit und ihres vergleichsweise günstigen Preises werden diese Sensoren auch heute noch in vielen Anwendungen eingesetzt. Wegen ihrer hohen Empfindlichkeit auf jegliche Änderung der elektrischen Eigenschaften in der Umgebung der Messelektrode werden kapazitive Näherungsschalter bei der berührungslosen Erkennung von Grenzständen eingesetzt, wobei der Sensor an der Außenseite eines nicht-leitenden Behälters angebracht ist. In den letzten Jahren sind die Anforderungen an die Sensorik immer weiter gestiegen. Statt einfacher Näherungsschalter, die ein binäres Schaltsignal ausgeben, werden heute zunehmend Sensoren gefordert, die ähnlich kompakt sind und die Sensorkapazität als Prozesswert ausgeben. Dadurch können potenziell neue Anwendungsfelder erschlossen werden. Insbesondere bei der Erkennung hoch-leitfähiger Medien sind Anhaftungen, die sich im Bereich der Messelektrode auf der Behälterinnenseite absetzen, problematisch. Die von den Sensoren gemessene Kapazität ist für das Vorhandensein einer leitfähigen Anhaftung und den tatsächlichen Vollzustand nahezu identisch, was zu Fehlauslösungen des Sensors führen kann. Es existieren bereits Ansätze leitfähige Anhaftungen auszublenden, wie beispielsweise die Verwendung kurzer Impulse als Anregungssignal. Allerdings sind die bei diesen Verfahren auftretenden großen Messfrequenzen ungünstig für das Sensorverhalten bezüglich der elektromagnetischen Verträglichkeit. Weiterhin können alternative Messprinzipien, wie beispielsweise Wirbelstromverfahren, verwendet werden. Bei diesen Verfahren ist jedoch die minimale Leitfähigkeit des Mediums, das detektiert werden kann, begrenzt. Ziel dieser Arbeit ist die Entwicklung eines Verfahrens zur Anhaftungserkennung bei kapazitiven Näherungsschaltern, das zusätzlich Informationen über das zu detektierende Medium liefert. Mit Hilfe der Impedanzspektroskopie gekoppelt mit analytischen und numerischen Modellierungsverfahren wird ein aus drei Parametern bestehendes vereinfachtes Modell entwickelt, das die zuverlässige Unterscheidung von Voll- Leer- und Anhaftungszustand ermöglicht. Einer dieser Parameter, der Gesamtwiderstand, erlaubt Rückschlüsse auf die Leitfähigkeit des zu detektierenden Mediums. Dieses neue Verfahren hat das Potenzial auch in komplexeren Applikationen Anwendung zu finden.
Capacitive sensors, especially capacitive proximity switches, are used in many applications because of their ability to detect almost any material. These sensors are still commonly used today due to their compact design, their high robustness and their comparatively low price. Because of their high sensitivity to changes of the electrical properties of materials in vicinity of the measurement electrode, capacitive proximity switches can be used for contactless limit level sensing. The sensor is often mounted on the outside of the liquid container. In recent years, requirements in regard to sensor performance have increased. Instead of just outputting a binary signal, capacitive proximity switches are expected to also output their measured capacitance, which could potentially open new fields of application. When detecting highly conductive fluids, soiling on the inside of the container in vicinity of the measurement electrode is problematic. The measured capacitance of a conductive film and the actual limit level are almost identical, which can cause false positive detection of a limit level. There are already various approaches to compensate for conductive soiling in vicinity of the measurement electrode, one of which includes the usage of short impulses for excitation. However, the high frequencies involved in these methods can cause problems with respect to electromagnetic compatibility. In addition, alternative measurement principles, like the eddy current principle, can be used. However, this principle imposes constraints on the minimum conductivity of the material to be detected. In this work, a technique to distinguish between conductive soiling and the actual fill level, which also allows to extract information about the material to be detected, is developed. Using impedance spectroscopy combined with analytical and numerical modelling, a model consisting of three parameters is developed. The model allows to reliably distinguish between actual limit level and conductive soiling. The overall resistance supplied by the model can be used as a measure for the conductivity of the material to be detected. The technique has the potential to be used in demanding applications.
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LIN, CHI-LUN, and 林啟倫. "Modeling and Design of a Capacitive Proximity Sensor." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/48707950369487448789.

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碩士
國立交通大學
機械工程系
91
This thesis describes the modeling and design of a proximity capacitive sensor using the so-called fringe capacitance. The model of the fringe capacitance produced by the varying distance of the target objects of different properties is discussed. Main points of the thesis are as follows: 1.Modeling of a capacitive proximity sensor. 2.Simulation of a capacitive proximity sensor. 3.Improvement of a capacitive proximity sensor’s structure. 4.Compare with measurement, simulation and analytic solution and discussion. Three types of materials are considered, i.e., 1. grounding conductors, 2.floating conductors, 3. dielectric materials. Analytic solutions of capacitance are solved by using Laplace’s equation, according to the different boundary conditions and uniqueness theorem. FEM (Finite Element Method) tool- ANSOFT EM is used to analyze the electrostatic fields surrounding electrodes and object. The simulation results are consistent with the analytic solutions within certain errors. The error caused in the analytic solution is investigated in the thesis. Finally, an experiment is conducted to obtain measurement results, which are also compared with simulation and analytic solution. They show consistent property qualitatively.
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Romanuik, Sean. "A microflow cytometer with simultaneous dielectrophoretic actuation for the optical assay and capacitive cytometry of individual fluid suspended bioparticles." 2009. http://hdl.handle.net/1993/3205.

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Fluid suspended biological particles (bioparticles) flowing through a non-uniform electric field are actuated by the induced dielectrophoretic (DEP) force, known to be dependent upon the bioparticles’ dielectric phenotypes. In this work: a 10-1000 kHz DEP actuation potential applied to a co-planar microelectrode array (MEA) induces a DEP force, altering passing bioparticle trajectories as monitored using: (1) an optical assay, in which the lateral bioparticle velocities are estimated from digital video; and (2) a capacitive cytometer, in which a 1.478 GHz capacitance sensor measures the MEA capacitance perturbations induced by passing bioparticles, which is sensitive to the bioparticles’ elevations. The experimentally observed and simulated lateral velocity profiles of actuated polystyrene microspheres (PSS) and viable and heat shocked Saccharomyces cerevisiae cells verify that the bioparticles’ dielectric phenotypes can be inferred from the resultant trajectories due to the balance between the DEP force and the viscous fluid drag force.
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Mahomed, Faheem. "Circuit level modelling of a capacitive electric field sensor." Thesis, 2012. http://hdl.handle.net/10539/11946.

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This work addresses the problem of modelling an electric field detection device. The modelling of the device was approached from two different perspectives. The first approach entailed using the physics principles which describe the operation of the electric field sensor, the contemporary theory which is used to analyze electric field sensors and its limitations. The second approach used the theory which describes the capacitive interaction of a four-bodied system. A robust circuit model was derived using both cases and shown to be interchangeable under the assumptions that the electrodes generating the electric field are sufficiently large and far enough from the sensor. An experimental apparatus was designed which could verify this model. This apparatus was composed of two major parts, namely the field generation device, and the field detection system. Considerations in the construction of the field generation device involved uniformity of the generated field and a ground reference of the supply. This influenced the design of the sensor system. The sensor system had to operate as a free-body system with no ground reference connection in order for the uniformity of the generated field to remain intact. The differences between the model prediction for the expected measurements and the actual physical measurements are small. Reasons for this difference are presented and they include non-uniformities in the generated field and non-ideal characteristics of the components and devices used for the experiment. Possible improvements to the model and sensor device are discussed and they include installation of an attachment which allows maneuverability of the sensor, such as an insulated handle and a further derivation which would result in a more geometrically independent model.
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Book chapters on the topic "Capacitive Sensor Modeling"

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Liu, Yang, Cheng Xinrong, Mu Haomiao, and Song Yuyao. "Improved Method for Modeling in Capacitive Grain Moisture Sensor." In Computer and Computing Technologies in Agriculture VIII, 144–50. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19620-6_18.

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Mishra, Rishabh Bhooshan, S. Santosh Kumar, and Ravindra Mukhiya. "Modeling and FEM-Based Simulations of Composite Membrane Based Circular Capacitive Pressure Sensor." In Lecture Notes in Electrical Engineering, 497–506. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9775-3_44.

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Thakur, O. P., and Nidhi Agrawal. "Modelling of Sensing Performance of Electrostrictive Capacitive Sensors." In Smart Sensors, Measurement and Instrumentation, 341–58. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-10948-0_17.

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Senapati, Mukut, and Partha Pratim Sahu. "Modelling and Simulation of a Patch Electrode Multilayered Capacitive Sensor." In Lecture Notes in Computer Science, 554–60. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-34872-4_61.

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Omondi, Fredrick A., Enver Ever, Purav Shah, Orhan Gemikonakli, and Leonardo Mostarda. "Performability Modelling and Analysis of Clustered Wireless Sensor Networks with Limited Storage Capacities." In Internet and Distributed Computing Systems, 369–82. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-11692-1_32.

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Villar, María Victoria, Rubén Javier Iglesias, Carlos Gutiérrez-Álvarez, and Gemma Campos. "Use of Psychrometers, Capacitive Sensors and Vapour Transfer Technique to Determine the Water Retention Curve of Compacted Bentonite." In Advances in Laboratory Testing and Modelling of Soils and Shales (ATMSS), 123–30. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52773-4_13.

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Shields, Joel, and Edward Konefat. "Modeling of Piezoceramic Actuators for Control." In Piezoelectric Actuators - Principles, Design, Experiments and Applications [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96727.

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In this chapter a full electromechanical model of piezoceramic actuators is presented. This model allows for easy integration of the piezo stack with a structural finite element model (FEM) and includes the flow of energy into and out of the piezo element, which is governed by the transducer constant of the piezo element. Modeling of the piezo stack capacitive hysteresis is achieved using backlash basis functions. The piezo model can also be used to predict the current usage of the PZT which depends on the slew rate of the voltage applied to the PZT. Data from laboratory experiments using a load frame and free response tests is used to estimate the PZT model parameters. In addition, a simplified model of a modulated full bridge strain gauge is derived based on test data which includes the effect of intrinsic bridge imbalance. Sensors of this type are often used with feedback control to linearize the behavior of the device. Taken together, the actuator and sensor model can be used for the development of piezo actuated control algorithms.
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O. Zaitsev, Ievgen, and Anatolii Levytskyi. "Hybrid Electro-Optic Capacitive Sensors for the Fault Diagnostic System of Hydrogenerator." In Advances in Modelling and Control of Wind and Hydrogenerators. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.88947.

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"Modeling for improved performance of non-contacting capacitive sensors for detecting aqueous solutions." In Impedance Spectroscopy, 107–24. De Gruyter, 2018. http://dx.doi.org/10.1515/9783110558920-011.

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Conference papers on the topic "Capacitive Sensor Modeling"

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Eswaran, Parthasarathy, and S. Malarvizhi. "Modeling of MEMS capacitive differential pressure sensor." In 2013 International Conference on Circuits, Power and Computing Technologies (ICCPCT). IEEE, 2013. http://dx.doi.org/10.1109/iccpct.2013.6528946.

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Wang, Yang, Jun-Ning Chen, Dao-Ming Ke, and Jiang Hu. "Modeling of a CMOS Capacitive Relative Humidity Sensor." In 2009 First International Workshop on Education Technology and Computer Science. IEEE, 2009. http://dx.doi.org/10.1109/etcs.2009.573.

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Saleh, Sherif, Amal Zaki, Hamed Elsemary, and S. Ahmad. "Modeling of Sensitivity of fabricated Capacitive Pressure Sensor." In IECON 2006. 32nd Annual Conference on IEEE Industrial Electronics. IEEE, 2006. http://dx.doi.org/10.1109/iecon.2006.347955.

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Chun-Shan Tsui. "Performance analysis in modeling micro capacitive pressure sensor." In 2009 4th International Microsystems, Packaging, Assembly and Circuits Technology Conference (IMPACT). IEEE, 2009. http://dx.doi.org/10.1109/impact.2009.5382303.

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Bretterklieber, T., M. Neumayer, and M. Flatscher. "Holistic system modeling of capacitive sensors: From sensor circuitry to calibration." In 2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC). IEEE, 2018. http://dx.doi.org/10.1109/i2mtc.2018.8409626.

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Jawed, S. A., Davide Cattin, N. Massari, M. Gottardi, B. Margesin, and A. Baschirotto. "A simplified modeling approach for a MEMS capacitive sensor." In 2007 European Conference on Circuit Theory and Design (ECCTD 2007). IEEE, 2007. http://dx.doi.org/10.1109/ecctd.2007.4529549.

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JOLY, Sylvain, Albrecht LEPPLE-WIENHUES, and Catherine DEHOLLAIN. "Modeling of a capacitive sensor dedicated to drug injection." In 2018 14th Conference on Ph.D. Research in Microelectronics and Electronics (PRIME). IEEE, 2018. http://dx.doi.org/10.1109/prime.2018.8430369.

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HongYu Ma, Qing-An Huang, Ming Qin, and TingTing Lu. "Modeling and simulation of a novel capacitive temperature sensor." In 2008 9th International Conference on Solid-State and Integrated-Circuit Technology (ICSICT). IEEE, 2008. http://dx.doi.org/10.1109/icsict.2008.4735056.

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Hazra, Arnab. "Capacitive modeling of TiO2 nanotube based gas/vapor sensor devices." In 2016 IEEE Nanotechnology Materials and Devices Conference (NMDC). IEEE, 2016. http://dx.doi.org/10.1109/nmdc.2016.7777097.

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Hashemi, Mahnaz, Jafar Ghaisari, and Yadollah Zakeri. "Modeling and compensation for capacitive pressure sensor by RBF neural networks." In 2010 8th IEEE International Conference on Control and Automation (ICCA). IEEE, 2010. http://dx.doi.org/10.1109/icca.2010.5524438.

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