Dissertations / Theses on the topic 'Accelerometer'
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Zhao, Dongning. "A low-noise CMOS interface for capacitive microaccelerometers." Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31715.
Full textPember, Andrew. "A micromachined silicon accelerometer." Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294739.
Full textMORIKAWA, SERGIO RICARDO KOKAY. "TRIAXIAL BRAGG GRATING ACCELEROMETER." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5413@1.
Full textTRANSMISSÃO DE ENERGIA ELÉTRICA S.A
Desde o final da década de 80 a indústria de fibras óticas têm passado por avanços consideráveis. Através de técnicas controladas, as fibras ópticas podem gerar sinais associados a uma vasta gama de grandezas físicas funcionando como sensores denominados de Sensores a Fibra Óptica (SFO s). Diversas técnicas podem ser empregadas para tal, e entre as existentes a baseada em redes de Bragg é a que mais tem se destacado. O interesse por transdutores empregando esta técnica se justifica pelas vantagens proporcionadas pelo uso da luz, tais como sua capacidade de multiplexação, boa relação sinal/ruído, medições a longas distâncias, imunidade a campos eletromagnéticos, ausência de faísca, entre outras. Neste trabalho buscou-se desenvolver um transdutor e uma técnica de medição baseada em sensores a rede de Bragg para medição de vibrações mecânicas. Um acelerômetro óptico triaxial é projetado e construído. Diferentes modelos foram testados em busca das características de desempenho desejadas. Simulações numéricas empregando o método dos elementos finitos auxiliaram na decisão por melhores desenhos para o transdutor. Resultados de testes experimentais e calibrações empregando um sistema de aquisição de sinais desenvolvido são mostrados. Medições de longa duração para avaliação de estabilidade do sistema e efeitos de temperatura também são apresentados.
Since the end of the 1980s, the fiber optics industry has experienced considerable advances. Through a number of controlled techniques, fiber optics can generate signals associated with a vast array of physical measures, working as sensors denominated Optical Fiber Sensors (OFS s). Many different techniques can be employed to achieve this objective. Among these, the one based on Bragg networks has received the greatest amount of attention. The interest in transducers employing this technique is justified by the advantages of using light, such as its multiplexing capability, good signal-to-noise ratio, possibility of long distance measurements, immunity to electromagnetic fields, and absence of sparks. In the present work, a transducer and measurement technique based on Bragg network sensors vibration are developed, in order to measure mechanical vibrations. A triaxial optical accelerometer is designed and built. Different models are tested in the search for the desired performance characteristics. Numerical simulations employing the finite element method help the decision making process for better transducer designs. Results from experimental and calibration tests using a newly developed signal acquisition system are presented. Long duration measurements to evaluate system stability and temperature effects are also shown.
Olcott, Joanne E. "Fiber-optic flexural disk accelerometer." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/26545.
Full textLubratt, Mark Paul. "A voltage-tunable microfabricated accelerometer." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/37497.
Full textGibbons, Kevin A. (Kevin Augustine). "A micromechanical silicon oscillating accelerometer." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43330.
Full textLoh, Nin C. (Nin Chin) 1977. "High-resolution micromachined interferometric accelerometer." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/89324.
Full textKampen, Robertus Petrus van. "Bulk-micromachined capacitive servo-accelerometer." [Delft] : Delft University Press, 1995. http://books.google.com/books?id=LHJTAAAAMAAJ.
Full textBaker, James. "Dead reckoning using an accelerometer." Thesis, Baker, James (2014) Dead reckoning using an accelerometer. Other thesis, Murdoch University, 2014. https://researchrepository.murdoch.edu.au/id/eprint/25673/.
Full textTidwell, Robert S. Jr. "An Accelerometer-based Gesture Recognition System for a Tactical Communications Application." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc822779/.
Full textMathie, Merryn Joy Electrical Engineering & Telecommunications Faculty of Engineering UNSW. "Monitoring and interpreting human movement patterns using a triaxial accelerometer." Awarded by:University of New South Wales. School of Electrical Engineering and Telecommunications, 2003. http://handle.unsw.edu.au/1959.4/27386.
Full textBoga, Biter. "Modelling And Noise Analysis Of Closed-loop Capacitive Sigma-delta Mems Accelerometer." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610772/index.pdf.
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accelerometer system consisting of a MEMS accelerometer, closed-loop readout electronics, and signal processing units (e.g. decimation filters). By using this model, it is possible to estimate the performance of the full accelerometer system including individual noise components, operation range, open loop sensitivity, scale factor, etc. The developed model has been verified through test results using a capacitive MEMS accelerometer, full-custom designed readout electronics, and signal processing unit implemented on a FPGA. Conventional accelerometer system with force-feedback is used in this thesis. The sensor is a typical capacitive lateral accelerometer. The readout electronics form a 2nd order electromechanical &
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modulator together with the accelerometer, and provide a single-bit PDM output, which is decimated and filtered with a signal processing unit, software implemented on a FPGA. The whole system is modeled in MATLAB-SIMULINK since it has both mechanical and electrical parts. To verify the model, two accelerometer systems are implemented. Each accelerometer system is composed of a MEMS accelerometer, readout circuit, and decimation filters. These two different designs are implemented and simulation and test results are compared in terms of output noise, operational range, open loop sensitivity, and scale factor. The first design operates at 500 kHz sampling rate and has 0.48 V/g open-loop sensitivity, 58.7 µ
g/&
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Hz resolution, ±
12g operation range, and 0.97*10-6 g/(output units) scale factor, where these numbers are in close agreement with the estimated results found with simulations. Similarly, the second design operates at 500 kHz sampling rate and has 0.45 V/g open-loop sensitivity, 373.3 µ
g/&
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Hz resolution, ±
31g operation range, and 2.933*10-6 g/(output units) scale factor, where these numbers are also close to the estimated results found with simulations. Within this thesis study, an accelerometer sensing element design algorithm is also proposed which is based on the theoretical background obtained in accelerometer system SIMULINK model. This algorithm takes the requirements of the desired accelerometer as input and outputs the dimensions of the minimum noise accelerometer satisfying these requirements. The algorithm is extended to design three different accelerometer structures. An accelerometer sensing element is designed using the proposed design algorithm and tested in order to see performance matching of the algorithm. The designed accelerometer has ±
33.02g operational range and 155µ
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Hz noise where these numbers matches with the values found by the algorithm
Säll, Joel, and Johnny Merkel. "Indoor Navigation Using Accelerometer and Magnetometer." Thesis, Linköpings universitet, Institutionen för systemteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-71277.
Full textWesterholm, Glenn. "Kadenssensor med en accelerometer och ANT+." Thesis, Linköpings universitet, Datorteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-119070.
Full textSjöström, Henrik. "DeepConvLSTM on single accelerometer locomotion recognition." Thesis, Umeå universitet, Institutionen för datavetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-142516.
Full textKaiser, Todd Jeffrey. "A micromachined pendulous oscillating gyroscopic accelerometer." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/13729.
Full textAshburn, Michael Anthony. "A high precision fully integrated accelerometer." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/40585.
Full textIncludes bibliographical references (p. 193-196).
by Michael Anthony Ashburn, Jr.
M.S.
Butts, David LaGrange. "Development of a light force accelerometer." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/46568.
Full textIncludes bibliographical references (p. 93-96).
In this work, the feasibility of a light force accelerometer was experimentally demonstrated. The light force accelerometer is an optical inertial sensor which uses focused laser light to levitate and trap glass microspheres as proof masses. Acceleration is measured by force rebalancing, which is exerted by radiation pressure from two counter-propagating laser beams. Proof mass displacements are measured by focusing light scattered by the proof mass on a position-sensitive photodetector. A simple model including laser relative intensity noise and shot noise from the measurement of the trapping beam powers estimates that the light force accelerometer could be capable of achieving a sensitivity of < 100 ng/Hz1/2. Essential components of this optical accelerometer, including the levitation of 10 pm glass microspheres in high vacuum and optical force rebalancing, were demonstrated with a single laser beam levitating a microsphere against gravity. Levitated particles are unstable in vacuum because of low viscous forces, so feedback stabilization is necessary for long term trapping. Preliminary performance diagnostics tested the short term sensitivity and bias stability of the apparatus for a constant 1 g acceleration. The factors currently limiting these performance parameters were determined to be bias instabilities associated with measurement of proof mass position and long term biases due to pressure-dependent radiometric effects. Proposed modifications to the current apparatus include the implementation of a two-beam light force accelerometer and a more precise particle position detection method which is less sensitive to proof mass irregularities. This two-beam configuration enables operation in any orientation and permits complete characterization of accelerometer performance. Steps to develop a compact light force sensor in the future are also suggested.
by David LaGrange Butts.
S.M.
Guo, Fei. "Micromachined capacitive accelerometer with crab-shape." Thesis, Cape Peninsula University of Technology, 2005. http://hdl.handle.net/20.500.11838/1282.
Full textPerhaps more popular than the piezoresistive type are the capacitive type of micromachined accelerometers. The capacitive accelerometer has many fine characteristics, such as simple structure, high sensitivity, strong ability of resisting disturbance, fast dynamic response and so on. It can also work under abominable condition. So it is occupying an important status in the technology of electronical measurement and being used in many kinds of metrical systems. In this paper, the capacitive accelerometer (CA) we will introduce and design is a parallel plate CA with crab-shape. It will detect the acceleration signal by the change of distance between two electrode plates, and its design standard came from the industrial requirements ofKENTRON Company. The whole paper can be divided into four main phases-introduction, study, design and analysis. At first, we have introduced the purpose and background of this thesis, and then the study and the discussion of relative literature. The content of these articles is mainly about the basic principle, types and applications of micro-sensors and this information will be very helpful to the design and analysis ofmy own CA. The course of design is primarily structure design. The main structures of CA are parallel plate structure and cylinder structure. The parallel plate structure is chosen for our CA after we did the comparison of performance and technique of making between these two types of structures. We use the concentrative mass as the top electrode plate and four beams are connected on the two sides of the plate separately.
Zhang, Rui. "Mechanics of micromachined bridge-type accelerometer." Thesis, Cape Peninsula University of Technology, 2005. http://hdl.handle.net/20.500.11838/1285.
Full textHaving simple structure and high sensitivity, micro accelerometer is a type of popular transducer used to measure the acceleration in a great variety of conditions. The bridge-type micro accelerometer is a typical micro accelerometer and has many types. As one of research project of Kentron in South Africa, the thesis presented here analyzes the bridge-type capacitive nticro accelerometer (BTCMA) and the bridge-type micro accelerometer with two piezoelectric thin films read-out (BTPMA). In this thesis, the similar structures are used on BTCMA and BTPMA For proving the fundamental mode of the structure can measure acceleration and utilizing the structural and electric characteristic to avoid the effect of higher modes, the program CoventorWare for nticro-electric-mechanical system (MEMS) design and analysis is used here to analyze the modes of these two structures, The two group piezoelectric thin films of BTPMA can be connected in serial or parallel configurations. Integrating piezoelectric effect method, strength method and energy method, the analytical analysis of these two configurations has been done with particular emphasis on the elastic characteristics of the thin films. The analytical formulas of transducer, sensitivity, resonance frequency, noise, quality factor, ntinimum detectable signal and maximum detectable range are obtained. According to the comparison results between these two configurations, the charge output in parallel configuration is a little more than that in serial configuration and the sensitivity in serial configuration is much higher than that in parallel configuration. Finally, a calculation of certain practical nticro accelerometer size is used to prove the above conclusions. On the base of capacitance theory, strength method and energy method, the analytical analysis of the BTCMA has been done in this thesis.
Young, Jonathan C. "Vibration analysis using a MEMS accelerometer." Thesis, Monterey California. Naval Postgraduate School, 2006. http://hdl.handle.net/10945/2409.
Full textAlsaedi, Mohammed Abbas Soudai. "Development of 3D Accelerometer Testing System." PDXScholar, 2016. https://pdxscholar.library.pdx.edu/open_access_etds/3371.
Full textGodhe, Manne, and Victor Stoltz. "GT3X - En valideringsstudie av en ny accelerometer." Thesis, Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-1158.
Full textSyfte och frågeställningar
Syftet med denna studie är att validera accelerometern GT3X. Utifrån detta syfte formulerades följande frågeställningar:
- Hur väl kan GT3X uppskatta energiutgift på olika intensiteter?
- Har kroppsplaceringen av GT3X någon betydelse för dess förmåga att uppskatta energiutgift?
- Vilka är gränsvärdena för GT3X-counts relaterat till METs?
Metod
9 kvinnor och 18 män (ålder: 22-36 år) gick och joggade på ett löpband (3 km/h, 4,9 km/h, 8 km/h och 10 km/h) och utförde ett steptest (180 BPM). GT3X bars på fem olika placeringar (höger överarm, ländrygg, höger fotled, höger handled samt höger sida på höften) samtidigt, i syfte att beräkna energiutgift, insamlades data om försökspersonens in- och utandningsluft med ett syreupptagningsmätningssystem. Korrelationen mellan vardera accelerometerplacering (överarm, ländrygg, fotled, handled, höft) och uppmätt energiutgift beräknades genom ett bivariat korrelationstest. Genom regressionsanalyser fastställdes den bästa prediktorn för total energiutgift, uppmätt med syreupptagningsmätningssystem. Detta gjordes för låga, höga samt blandade intensiteter. Regressionsanalyserna utfördes med hänsyn till accelerometervektorer, vikt, längd och isättningar. I samtliga regressionsanalyser plockades även puls med, i ett separat steg.
Resultat
Samtliga placeringar visade hög korrelation, mellan GT3X-counts och uppmätt energiutgift, på låga intensiteter (rö.arm= 0, 840, rländrygg= 0,832, rfotleden= 0,790, rhandled= 0,789, rhöft= 0,801) samt över hela intensitetsspannet sammantaget (rö.arm= 0,704 rländrygg= 0,749 rfotleden= 0,600 rhandled= 0,642 rhöft= 0,716). På höga intensiteter visades, för samtliga placeringar, ett svagt negativt samband (rö.arm= -0,109, rländrygg= -0,086, rfotleden= -0,122, rhandled= -0,189, rhöft= -0,074) mellan GT3X counts och uppmätt energiutgift. På samtliga intensiteter kunde GT3X, tillsammans med övrig data, förklara upptill 87,1 % av variationer av uppmätt energiutgift (R2=0, 871).
Slutsats
GT3X är ett valitt mätinstrument för uppskattning av energiutgift på låg- samt blandad intensitet. Vid måttlig till hög intensitet är GT3X beroende av puls, för att uppnå samma höga förklaringsgrad. Placeringen av GT3X har en marginell betydelse vid uppskattning av energiutgift, detta gäller oavsett intensitet. Gränsvärdena för GT3X counts relaterat till METs varierar beroende på placering.
Jung, Changsu. "Measuring movement of golfers with an accelerometer." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105144.
Full textMui, Man Kit. "Development and characterization of PCB-based accelerometer /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?MECH%202007%20MUI.
Full textKraft, Michael. "Closed loop digital accelerometer employing oversampling conversion." Thesis, Coventry University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361662.
Full textSivapiragasam, Sanjivan. "Accelerometer calibration of shuttle-based experiment packages." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/42509.
Full textNeedham, Richard Lee. "Calibration of strapdown system accelerometer dynamic errors." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/47358.
Full textMajala, Jonas. "Frequency analysis of accelerometer measurements on trains." Thesis, Luleå tekniska universitet, Geoteknologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-63930.
Full textDiaz, Jason McMurray Robert G. "Calibration of the Actical accelerometer in adults." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2009. http://dc.lib.unc.edu/u?/etd,2201.
Full textTitle from electronic title page (viewed Jun. 26, 2009). "... in partial fulfillment of the requirements for the degree of Master of Arts in the Department of Exercise and Sport Science Exercise Physiology." Discipline: Exercise and Sports Science; Department/School: Exercise and Sport Science.
Metcalf, Kristen M. "Accelerometer positioning issues and contemporary analysis methods." Diss., University of Iowa, 2018. https://ir.uiowa.edu/etd/6210.
Full textMills, Euclid Weatley. "Mobile robotic design : robotic colour and accelerometer sensor." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4436.
Full textCoultate, John. "Optimal and robust design of a MEMS accelerometer." Thesis, University of Nottingham, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438643.
Full textFORSS, ANTON. "Verifiering av accelerometer mätning i 16-bitars mikrokontroller." Thesis, KTH, Produkt- och tjänstedesign, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-249712.
Full textThis report is a final thesis report at the institution of Mechatronics at KTH (The Royal institute of Technology). In this report two methods for development and verification are compared for acceleration analysis in a weapon with a microcontroller (hence called µC). A µC of type MSP430G2553 is used as target system. The goal of the µC's program is to determine if an acceleration pattern is a recoil or not. In the report two methods are presented for verification and development. Alternative 1 is limited to using the target µC and software tools associated with it. Alternative 2 is using the target µC and software tools but also and additional combination instrument which includes both oscilloscope and arbitrary waveform generator. The combination instrument was used to measure several recoil acceleration patterns. These reference measurements were used to simulate accelerometer for the target system. The conclusion is that alternative 2's use of the combination instrument is of great benefit in several perspectives. Alternative 1's also has several benefits. Furthermore alternative 2 enables early identification of the acceleration data without the limits of the µC as memory constraints and program defects. The combination instrument is a useful tool for development, as it can be used as a small HIL-system
St, Michel Nathan A. (Nathan Alan) 1975. "Force multiplier in a microelectromechanical silicon oscillating accelerometer." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/31084.
Full textIncludes bibliographical references (leaves 89-90).
This thesis describes the third generation design of a silicon oscillating accelerometer (SOA.) The device is a micromachined vibrating beam accelerometer consisting of two tuning fork oscillators attached to a large proof mass. When accelerated along the input axis, the proof mass exerts a force on the oscillators, causing their natural frequencies to shift in opposing directions. Taking the difference of these frequencies gives a measurement of the applied acceleration. A significant feature in the new design is a force multiplying lever arm which connects the oscillators to the proof mass. With this addition, the surface area of the proof mass is reduced by a factor of four, while the scale factor and axial resonant frequency of the previous design is retained. All vibration modes of the device are identified, and stiffness nonlinearity in the oscillators is investigated. A method to compensate for thermally induced acceleration errors is also introduced. Testing of the fabricated device is shown to agree with model predictions.
by Nathan St. Michel.
S.M.
Brooks, Lane Gearle 1975. "Amplitude and frequency demodulation controller for MEMS accelerometer." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8938.
Full textIncludes bibliographical references (p. 121-122).
Draper Laboratory is developing a high precision MEMS accelerometer. This thesis describes and analyzes the electronics which produce the acceleration estimate and control the actuators within the sensor. The Vector Readout method of amplitude and frequency demodulation is described and shown to be a high precision, environmentally stable method of demodulation. The Vector Readout method of demodulation uses a Hilbert Transform filter and the CORDIC algorithm to simultaneously estimate both the amplitude and phase of a signal. A feedback controller is designed to hold the oscillation of a mass resonator at a constant amplitude.
by Lane Gearle Brooks.
M.Eng.and S.B.
Kotru, Krish. "Toward a demonstration of a Light Force Accelerometer." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62486.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (p. 79-81).
The Light Force Accelerometer (LFA) is an optical inertial sensor in which radiation pressure from two counter-propagating laser beams optically confines a glass microsphere. Inertial acceleration of the device results in microsphere displacement along the sensitive axis, which is subsequently nulled by optical forces to provide an acceleration measurement. A simple calculation that takes into account fundamental noise processes in the LFA (i.e., shot noise and RIN in the laser beams) places the sensitivity limit of this accelerometer at < 100 ng. By incorporating widely available, inexpensive optical components into a simple design, a high-precision LFA could provide an appealing alternative to other sensors of comparable performance. Previous work on the LFA revealed instabilities in proof mass position detection caused by the asphericity of microspheres. In this thesis, an alternative method for position detection which was less sensitive to shape-irregularities in microspheres was investigated. Results indicated that resolution of microsphere motion was enhanced significantly when the new detection method was implemented. This improvement. however, did not eliminate the position instabilities observed previously. Capabilities for optical trapping with two counter-propagating beams in air were also developed in this work. Trapping with feedback position control in air was demonstrated for the first time, but long-term trapping in vacuum was prohibitively difficult due to destabilizing mechanical vibrations. For a microsphere in atmospheric pressure, the estimated bias stability was 318 jig after 300 seconds of averaging, and the approximate short-term sensitivity was 500 pg/v/ Hz. Stabilization of mechanical vibrations and precise calibration of power measurements to acceleration will allow this two-beam trap to probe the performance limits of the LFA.
by Krish Kotru.
S.M.
Song, Wen. "Planetary navigation activity recognition using wearable accelerometer data." Thesis, Kansas State University, 2013. http://hdl.handle.net/2097/15813.
Full textDepartment of Electrical & Computer Engineering
Steve Warren
Activity recognition can be an important part of human health awareness. Many benefits can be generated from the recognition results, including knowledge of activity intensity as it relates to wellness over time. Various activity-recognition techniques have been presented in the literature, though most address simple activity-data collection and off-line analysis. More sophisticated real-time identification is less often addressed. Therefore, it is promising to consider the combination of current off-line, activity-detection methods with wearable, embedded tools in order to create a real-time wireless human activity recognition system with improved accuracy. Different from previous work on activity recognition, the goal of this effort is to focus on specific activities that an astronaut may encounter during a mission. Planetary navigation field test (PNFT) tasks are designed to meet this need. The approach used by the KSU team is to pre-record data on the ground in normal earth gravity and seek signal features that can be used to identify, and even predict, fatigue associated with these activities. The eventual goal is to then assess/predict the condition of an astronaut in a reduced-gravity environment using these predetermined rules. Several classic machine learning algorithms, including the k-Nearest Neighbor, Naïve Bayes, C4.5 Decision Tree, and Support Vector Machine approaches, were applied to these data to identify recognition algorithms suitable for real-time application. Graphical user interfaces (GUIs) were designed for both MATLAB and LabVIEW environments to facilitate recording and data analysis. Training data for the machine learning algorithms were recorded while subjects performed each activity, and then these identification approaches were applied to new data sets with an identification accuracy of around 86%. Early results indicate that a single three-axis accelerometer is sufficient to identify the occurrence of a given PNFT activity. A custom, embedded acceleration monitoring system employing ZigBee transmission is under development for future real-time activity recognition studies. A different GUI has been implemented for this system, which uses an on-line algorithm that will seek to identify activity at a refresh rate of 1 Hz.
Zou, Xudong. "High resolution resonant accelerometer based on MEMS technology." Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/283942.
Full text羅智德. "MEMS Accelerometer Design." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/13434599323520473766.
Full text中華大學
機械與航太工程研究所
88
Several kinds of MEMS accelerometers are proposed by using the UMC standard fabrication process. Firstly, the IntelliSuite software package is applied for the process simulation. Secondly, the ANSYS software package is used for the accelerometer proof mass displacement and structural strain and stress simulation. Thirdly, the layout is realized by using Tanner Tools Pro program. Finally, the masks are made by NDL and supported by CIC for fabrication. The proposed MEMS accelerometers are of two types; one is with single capacitor, and the other is with two capacitors for differential mode operation. The operating rang of the accelerometer is under 3 g’s, which can be used for the vertical navigation. The advantage of the differential mode is that the effects due to thermal, aging fatigue and noise can be reduced. By the way, one can further reduce the bias and thermal effects by using the proposed multi-accelerometers structure, one is based on the displacement of proof mass, and the other is made by piezo-resistive principle.
"CNT-based thermal convective accelerometer." 2009. http://library.cuhk.edu.hk/record=b5894128.
Full textThesis (M.Phil.)--Chinese University of Hong Kong, 2009.
Includes bibliographical references (leaves 55-60).
Abstract also in Chinese.
Abstract --- p.i
Acknowledgement --- p.iii
Chapter 1 --- Introduction --- p.1
Chapter 1.1 --- Background --- p.1
Chapter 1.2 --- Aim of Research --- p.2
Chapter 1.3 --- Thesis Organization --- p.3
Chapter 2 --- Literature Review --- p.4
Chapter 2.1 --- Carbon Nanotubes in MEMS Devices --- p.4
Chapter 2.1.1 --- CNT Integration and CNT sensors --- p.4
Chapter 2.1.2 --- Prior Work in CMNS --- p.6
Chapter 2.2 --- Overview of Motion Sensors --- p.7
Chapter 2.2.1 --- Technology Overview --- p.7
Chapter 2.2.2 --- Categories and Working Principles --- p.9
Chapter 2.2.3 --- Application --- p.13
Chapter 2.3 --- Thermal Convective Motion Sensors --- p.14
Chapter 2.3.1 --- Micro Thermal Flow Sensors --- p.15
Chapter 2.3.2 --- Research on Thermal Convective Motion Sensors --- p.17
Chapter 2.3.3 --- Working Principle and Performances --- p.20
Chapter 3 --- Design and Setup --- p.25
Chapter 3.1 --- Methodology --- p.25
Chapter 3.1.1 --- Research Method --- p.25
Chapter 3.1.2 --- Critical Questions --- p.26
Chapter 3.2 --- Sensor Chip Design and Fabrication --- p.27
Chapter 3.2.1 --- Sensor Chip Mask Design --- p.27
Chapter 3.2.2 --- Fabrication of Sensor Chip --- p.29
Chapter 3.3 --- Sensor Prototyping --- p.30
Chapter 3.3.1 --- CNT Deposition --- p.30
Chapter 3.3.2 --- Sensor Building --- p.32
Chapter 3.4 --- Setup of Experiment --- p.34
Chapter 3.4.1 --- Source and Measure --- p.34
Chapter 3.4.2 --- Acceleration Production --- p.35
Chapter 4 --- Experiments and Results --- p.39
Chapter 4.1 --- Hypotheses Verification --- p.39
Chapter 4.1.1 --- Thermal Detection Using CNT --- p.39
Chapter 4.1.2 --- Local Heating & Sensing --- p.40
Chapter 4.2 --- Tilting Test --- p.42
Chapter 4.2.1 --- Test Result --- p.42
Chapter 4.2.2 --- Result Discussions --- p.43
Chapter 4.3 --- Vibration Test --- p.45
Chapter 4.3.1 --- Test Result --- p.45
Chapter 4.3.2 --- Result Discussions --- p.52
Chapter 5 --- Conclusion --- p.53
Bibliography --- p.55
Dai, Hung-Da, and 戴宏達. "CMOS-MEMS z-axis accelerometer." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/60731307885686218511.
Full textYang, Chih-Jen, and 楊智任. "Using Accelerometer in Vehicle Positioning." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/02247516448136932761.
Full text國立臺灣海洋大學
機械與機電工程學系
95
In this thesis, the problem of vehicle position estimation using an accelerometer is investigated based on Kalman filtering theory, and a linear motion system is implemented in the experiment to test the performance. In generally, the position estimation problems using accelerometers without any filtering process will become divergent as time elapse. This is because the sensor’s signals inevitably contain a certain extent of noises, and the noises accumulate during the integration process. Hence in order to estimate the position more accurately, Kalman filtering algorithm is usually employed to derive a more reliable result. One of the prerequisites in using Kalman filter is that the information of the process noise covariance and measurement noise covariance should be known in advance in order to derive the best estimation result. The above mentioned noises are generally dependent variables with respect to the motion states. Hence in the thesis, we measured the optimal state noises versus a set of jerk values through the experiments, and then by feeding them into the neural network to memorize the relationship. Then Kalman filter would update the state noise values according to the current motion states during the position estimation experiments. From the experimental result, it showed that the proposed algorithm was proved to be a reliable estimation algorithm.
Huang, Foo-tsung, and 黃復聰. "Integrated Accelerometer/GPS Heading Estimator." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/74788950055560428429.
Full text國立臺灣大學
應用力學研究所
89
Based on the idea of Kalman filtering, the heading estimator of a baseline vector integrating accelerometer and Global Positioning System(GPS)is designed in this thesis. The accelerometers not only can provide the acceleration of a vehicle, but also can be used to obtain attitude information of the vehicle by suitable arrangement and integration. For the problem of heading estimation, we may place four sets of one axis accelerometers at both ends of the baseline. By measuring the tangential acceleration and the centripetal acceleration, an extended Kalman filter can be used to compute the heading angle of the baseline vector. On the other hand, using the GPS Carrier-Smoothed-Code(CSC) algorithm, the heading angle estimate can be obtain in the rate of 1Hz. Although the accelerometers can provide the attitude information at a higher sampling rate(e.g. 100Hz), the accumulation errors due to integration make it necessary to perform adjustment periodically. On the contrary, although GPS estimation has lower sampling rate, it can be used to correct the drifting errors of the accelerometers. To integrate the two systems, a multi-rate filter is designed to obtain the optimal and real-time heading angle estimation. From the simulation results and the experimental results described in this thesis, it is observed that the 2nd order EKF can solve the singularity problem from the nonlinear measurement equation when the angular velocity is close to zero. Moreover, the proposed accelerometer/GPS integrated heading estimator can indeed eliminate the errors from the drift phenomenon, and provide the accurate heading angle estimate of the baseline vector in real time.
Chang, Ming-Han, and 張銘漢. "Action Recognition with 3D Accelerometer." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/78718632121220097634.
Full text義守大學
資訊工程學系
102
Mobile devices and human-computer interaction techniques have gained much attention in recent years. Many mobile phone manufacturers have also invested considerable human resources in establishing uniqueness of their own devices. In November 2006, Nintendo released a somatosensory game host, Wii. An unprecedented game mode with the Wii Remote is equipped with a three-dimensional accelerometer. This accelerometer can be used as an action recognition, and returns a message to the host. Three-dimensional accelerometer can be applied to different aspects including digital teaching, appliance control, home security monitoring, medical rehabilitation, etc. The purpose of this study is based on the remote control to analyze the composition of continuous signals. Signals are converted into strings, and then compared with a predefined codebook to achieve the action recognition.
Zheng, Yonglei. "Predicting activity type from accelerometer data." Thesis, 2012. http://hdl.handle.net/1957/33727.
Full textGraduation date: 2013
Long, Li. "Multi-Axis Fiber Bragg Grating Accelerometer." Thesis, 2010. http://hdl.handle.net/10222/12844.
Full textLin, Chia-Wei, and 林佳暐. "CMOS MEMS Accelerometer With Variable Inductors." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/9qg5ea.
Full text國立交通大學
電控工程研究所
103
In this thesis, an inductive sensing accelerometer was fabricated by CMOS MEMS process. This accelerometer use this spring as the oscillator inductors and MIM capacitors with the formation of an LC oscillator. The inductance value is changed due to the spring mass displacement and force causing by external acceleration. With changing in inductance value, LC oscillator frequency will also change. The change in the oscillator frequency will be proportional to the acceleration. It is capable for detecting acceleration by detecting different output frequencies. A 4/1000 change for inductance value is expected under 1g acceleration corresponding to oscillator frequency change of 3.3MHz. In this thesis, two device were designed and fabricated. Sample 1 was fabricated by 1P6M 0.18um process, and Sample 2 was 1P5M 0.18um process. Due to limited time and maintenance of facilities, post processes were not finished for Sample 2. Only part of the measurement for circuit have been done for Sample 2. For Sample 2, the circuit was working and an oscillator frequency of 2.7GHz was measured. The mixer output of Sample 2 was 33MHz. The mechanical properties measurement on Sample 1 has been done, the mechanical resonance frequency of 2.4kHz was measured. However, the circuit for Sample 1 was not working. A re-simulation for Sample 1 in later chapters has been done for discussing the failed reason.
Charng, Jie-Yann, and 常嘉彥. "Analysis on Performance of Piezoelectric Accelerometer." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/77342756508756970797.
Full text國立成功大學
機械工程研究所
84
Consider a piezoelectric beam. Based on the piezoelectricity with consideration for the coupling between the strain field and the electric field, a finite element formulation is developed. This study uses this code to analyze the response of the structure subjected to boundary vibration and the sensor electrical outputs as well as to determine the boundary condition from output voltage. Besides,this study also analyze performance limitations of the accelerometers as well as to determine the design parameter from some performance limitation.
Li, Kun-Hong, and 李坤鴻. "Study on Accelerometer based Motion Classification." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/86891260402190392146.
Full text國立臺灣科技大學
電機工程系
98
In this thesis, we reported our study of using a Wii Remote to capture the acceleration trajectories of motions, where those motions are considered as gestures for recognition. The aim of this study is to investigate the use of a Wii Remote in capturing motions made by a user so that those motions can be recognized to define some control commands for control electronic devices. A direct approach of motion classification with the use of some similarity measure used in Functional Artificial Neural Networks (FANN) will be proposed first. The second issue considered in our study is the use of the functional mapping characteristic of FANN for the motion classification problem. The original functions may not be easy to handle and then if the original function can be mapped by FANN to another functions which is easy to handle, the system may have more accurate classification for motions. Since two dimensional trajectories are considered in our experiments, a way of combining those two similarity measures is proposed. This measure fusion approach is based on the fuzzy concept and Gaussian functions are used to characterize the fuzzy membership functions. Our experiments show that the recognition rate of the proposed motion classification is about 96%. The use of FANN seems not helpful. A more subtle study is needed for this issue.