Tesis sobre el tema "MEMS"
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Midtflå, Roar. "RF MEMS". Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-10337.
Texto completoFagområdet RF MEMS er i rask utvikling og det finnes et utall forskjellige patenter innen dette området. Denne oppgaven fokuserer på en type nemlig radial contour mode diskresonator med sikte på å bruke den i SMiDA prosjektet Mer spesifikt går oppgaven ut på å teste forskjellige diskparametre for å finne ut hvilken som er best egnet. Noe konkret svar på dette finnes ikke, men det kan være interessant å bruke 2.mode til en disk på 16μm eller 3.mode til en disk på 20μm. En fant også frem til et spesielt design som gav veldig høy radiell amplitude i 1.mode.
Adamec, Richard. "MEMS Anemometer". Thesis, Griffith University, 2007. http://hdl.handle.net/10072/365273.
Texto completoThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Engineering
Full Text
Saha, Shimul Chandra. "RF MEMS Switches and Switch Circuits : Modeling of RF MEMS switches and development of RF MEMS capacitive switches and MEMS tunable filters". Doctoral thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-2297.
Texto completoHedestig, Joel. "MEMS baserad referensoscillator". Thesis, Linköpings universitet, Institutionen för systemteknik, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2780.
Texto completoLarsson, Michael Peter. "MEMS electrical connectors". Thesis, Imperial College London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439300.
Texto completoCao, J. "Magnetic MEMS actuators". Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597277.
Texto completoIsmail, Abd Khamim. "MEMS mass sensor". Thesis, University of Newcastle Upon Tyne, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430353.
Texto completoHasík, Stanislav. "Testování MEMS gyroskopů". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-240919.
Texto completoIzham, Zaki. "Resonant MEMS magnetometer". Thesis, University of Birmingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436751.
Texto completoMihaľko, Juraj. "MEMS inerciální snímače". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219724.
Texto completoArrigoni, Giacomo. "Commande pour MEMS électrostatique /". Sion, 2008. http://doc.rero.ch/record/12798?ln=fr.
Texto completoKotovsky, Jack. "MEMS contact stress sensing /". For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2005. http://uclibs.org/PID/11984.
Texto completoSpecht, Hendrik. "MEMS-Laser-Display-System". Doctoral thesis, Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-71334.
Texto completoAzgin, Kivanc. "High Performance Mems Gyroscopes". Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608194/index.pdf.
Texto completom and structural layer thickness of 25 µ
m. Die sizes of the fabricated gyroscope chips are 4.1 mm x 4.1 mm for the single mass, 4.1 mm x 8.9 mm for the double mass, and 8.9 mm x 8.9 mm for the quadruple mass gyroscope. Fabricated gyroscopes are tested with dedicated differential readout electronics constructed with discrete components. Drive mode resonance frequencies of these gyroscopes are in a range of 3.4 kHz to 5.1 kHz. Depending on the drive mode mechanics, the drive mode quality (Q) factors of the fabricated gyroscopes are about 300 at atmospheric pressure and reaches to a value of 2500 at a vacuum ambient of 50 mTorr. Resolvable rates of the fabricated gyroscopes at atmospheric pressure are measured to be 0.109 deg/sec, 0.055 deg/sec, and 1.80 deg/sec for SMG, DMG, and QMG, respectively. At vacuum, the respective resolutions of these gyroscopes improve significantly, reaching to 106 deg/hr with the SMG and 780 deg/hr with the QMG, even though discrete readout electronics are used. Acceleration sensitivity measurements at atmosphere reveal that QMG has the lowest bias g-sensitivity and the scale factor g sensitivity of 1.02deg/sec/g and 1.59(mV/(deg/sec))/g, respectively. The performance levels of these multi-mass gyroscopes can be even further improved with high performance integrated capacitive readout electronics and precise sense mode phase matching.
Dimitrakopoulos, Nikolaos. "Electromagnetic MEMS RF Switch". Thesis, University of Leeds, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485179.
Texto completoTse, Laam Angela. "MEMS packaging with stereolithography". Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/17025.
Texto completoPopa, Laura C. "Gallium nitride MEMS resonators". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/99296.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 187-206).
As a wide band-gap semiconductor, with large breakdown fields and saturation velocities, Gallium Nitride (GaN) has been increasingly used in high-power, high-frequency electronics and monolithic microwave integrated circuits (MMICs). At the same time, GaN also has excellent electromechanical properties, such as high acoustic velocities and low elastic losses. Together with a strong piezoelectric coupling, these qualities make GaN ideal for RF MEMS resonators. Hence, GaN technology offers a platform for the seamless integration of low-loss, piezoelectric RF MEMS resonators with high power, high frequency electronics. Monolithic integration of MEMS resonators with ICs would lead to reduced parasitics and matching constraints, enabling high-purity clocks and frequency-selective filters for signal processing and high-frequency wireless communications. This thesis highlights the physics and resonator design considerations that must be taken into account in a monolithically integrated solution. We then show devices that achieve the highest frequency-quality factor product in GaN resonators to date (1.56 x 1013). We also highlight several unique transduction mechanisms enabled by this technology, such as the ability to use the 2D electron gas (2DEG) channel of High Electron Mobility Transistors (HEMTs) as an electrode for transduction. This enables a unique out-of-line switching capability which allowed us to demonstrate the first DC switchable solid-state piezoelectric resonator. Finally, we discuss the benefits of using active HEMT sensing of the mechanical signal when scaling to GHz frequencies, which enabled the highest frequency lithographically defined resonance reported to date in GaN (3.5 GHz). These demonstrated features sh
by Laura C. Popa.
Ph. D.
Schaevitz, Samuel B. (Samuel Benjamin) 1978. "A MEMS thermoelectric generator". Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/28253.
Texto completoIncludes bibliographical references (p. 153-163).
The demand for portable power is large and expanding. Technologies currently available to meet this demand include batteries, fuel cells, thermophotovoltaic (TPV) generators and thermoelectric (TE) generators. Fuel cells and generators offer significantly improved performance over batteries, but issues of fuel processing and miniaturization remain. Microfabrication has the potential to address this miniaturization. Here I present work towards a thermoelectric generator based on micro-electro-mechanical system (MEMS) fabrication technologies. This thesis includes an examination of the current state of the portable power field, followed by an explanation of the thermoelectric effects and the operation of thermoelectric generators. A new analysis of the efficiency of thermoelectric devices, including parasitic losses, is included, with a detailed derivation in an appendix. The design of a prototype MEMS thermoelectric generator is presented, analyzed and fabricated. Testing shows the device performs as expected thermally. However, mechanical fragility causes very low yield during fabrication and limits the high temperature operation. Poor electrical contacts are also observed and characterized. Directions for future work are suggested to improve the efficiency and mechanical strength of the device.
by Samuel B. Schaevitz.
M.Eng.
Eves, Daniel Patrick. "Materials for magnetic MEMS". Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612715.
Texto completoMiddlemiss, Richard Paul. "A practical MEMS gravimeter". Thesis, University of Glasgow, 2016. http://theses.gla.ac.uk/7788/.
Texto completoKlempa, Jaroslav. "Sběr energie pomocí MEMS". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-399468.
Texto completoPehlivanoglu, Ibrahim Engin. "SILICON CARBIDE MEMS OSCILLATOR". Case Western Reserve University School of Graduate Studies / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1196372276.
Texto completoYao, Tze-Jung Tai Yu-Chong. "Parylene for MEMS applications /". Diss., Pasadena, Calif. : California Institute of Technology, 2002. http://resolver.caltech.edu/CaltechETD:etd-07202004-135306.
Texto completoRyšavý, Jindřich. "Předzesilovač pro MEMS mikrofon". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242074.
Texto completoPavageau, Franklin. "Actionneurs piézoélectriques MEMS transparents". Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALT018.
Texto completoThe functionalization of glass or flexible surfaces with transparent piezoelectric MEMS actuator devices would allow the emergence of new applications, particularly in the areas of tactile haptics or human-machine interfaces. However, there are some issues related to the thermal budget of the crystallization annealing of PZT (typically 700°C), the best piezoelectric material for actuator applications. In fact, standard glass substrates reach their deformation point around 450°C. Additionally, transparent electrodes, particularly ITO, may see their resistivity increase at high temperatures. This is why CEA-LETI has developed a process for transferring layers from wafer to wafer to circumvent these problems. The state-of-the-art PZT-based piezoelectric stacks thus transferred have similar or even identical properties before and after transfer, either on a glass substrate or on a Si substrate. Functional devices such as piezoelectric membranes on Si and actuator type capacitors on glass, having on average 75 to 80 % transmission in the visible, were thus produced and characterized. Furthermore, the demonstration of the good temperature resistance of ITO, annealed at 700°C in air, presenting a resistivity equal to 5x10−4 Ω.cm, considered to be low resistive for this material, motivated the evaluation of PZT sol-gel depositon directly on ITO. The properties of the 500 nm thick PZT thus deposited on 500 nm thick ITO are very encouraging, with for example a piezoelectric coefficient d33,f max of the order of 100 pm/V, approaching the state art. The addition of an anti-reflective layer based on SiO2, optimized in thickness, also playing the role of passivation on our capacitors, then made it possible to gain on average 10 % in transmission. Finally, optical simulations show that by varying the thicknesses of the layers, for example by reducing the thicknesses of the ITO electrodes down to 50-60 nm, average transmissions of 90 % are achievable
Maddela, Madhurima Ramadoss Ramesh. "Design of MEMS-based tunable antennas, organic transistors and MEMS-based organic control circuits". Auburn, Ala, 2008. http://repo.lib.auburn.edu/2007%20Fall%20Dissertations/Maddela_Madhurima_8.pdf.
Texto completoUzunlar, Erdal. "Improvements for chip-chip interconnects and MEMS packaging through MEMS materials and processing research". Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53509.
Texto completoPourkamali, Anaraki Siavash. "Electrically Coupled MEMS Bandpass Filters". Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5250.
Texto completoOcak, Ilker Ender. "A Tactical Grade Mems Acceleroemeter". Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612724/index.pdf.
Texto completos are commercially available in the market which have been fabricated using micromachining technologies. The aim of this research is to develop such a state-of-the-art micro-machined accelerometer system, whose performance is expected to reach tactical-grade level. In order to achieve these performance values a MATLAB algorithm is developed to optimize the accelerometer performances in the desired levels. Expected performance parameters of the designed accelerometer structures are extracted from the simulations done by both Coventorware finite element modeling tool and MATLAB. Designed structures are then fabricated with silicon-on-glass, dissolved wafer and dissolved epitaxial wafer processes. These fabrication results are compared and it is observed that highest yield accelerometers are fabricated with the SOG process. But these accelerometers could not be able to satisfy tactical grade performance parameters. Best performances are obtained with DWP, but due to high internal stress, yield of the sensors were very low. DEWP increased the yield of this process from 2-3% to 45-50% but the expected operation range of the designs dropped to ±
12.5g range. Using the fabricated accelerometers in DEWP a three axial accelerometer package is prepared and tests results proved that this three axial accelerometer system was satisfying the tactical grade requirements. In addition to these a three axial monolithic accelerometer fabrication technique is proposed and sensors are designed which are suitable for this process. Best performances achieved with single axis accelerometers were 153µ
g/&radic
Hz noise floor, 50µ
g bias drift, 0.38% non-linearity and a maximum operation range of 33.5g which has the higher dynamic range among its counterparts in the literature. Performance results achieved with the three axes accelerometer were ~150µ
g bias drift, <
200µ
g/&radic
Hz noise density, ~0.4% non-linearity with higher than ±
10g operation range.
Diamantis, Sotirios. "A programmable MEMS bandpass filter". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ62206.pdf.
Texto completoBell, Patrick J. "MEMS-reconfigurable microwave power amplifiers". Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3219036.
Texto completoFrisk, Thomas. "MEMS interfaces for bioanalysis systems /". Stockholm : Elektriska energisystem, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4609.
Texto completoNaumann, Michael. "MEMS reliability in shock environments". Doctoral thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-117360.
Texto completoForsberg, Fredrik. "Heterogeneous material integration for MEMS". Doctoral thesis, KTH, Mikro- och nanosystemteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-129185.
Texto completoQC 20131003
Jenkins, Colin. "MEMS actuated retroreflective phase modulator". Thesis, University of Strathclyde, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436834.
Texto completoGabbay, Lynn Daniel. "Computer aided macromodeling for MEMS". Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9955.
Texto completoIncludes bibliographical references (p. 85-87).
by Lynn Daniel Gabbay.
Ph.D.
Ramaswamy, Deepak 1974. "Mixed regime simulation in MEMS". Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/46145.
Texto completoCottrell, Jared D. (Jared Desjardins) 1975. "Server architecture for MEMS characterization". Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/47696.
Texto completoIncludes bibliographical references (leaves 85-87).
by Jared D. Cottrell.
S.B.and M.Eng.
Then, Alan M. (Alan Michael) 1965. "Commercialization of microelectromechanical systems (MEMS)". Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8920.
Texto completoIncludes bibliographical references (leaves 69-72).
Microelectromechanical systems (MEMS), at their core are a set of technologies that employ the processes developed in the integrated circuit (IC) and semiconductor industries to construct electro- mechanical devices. In the case of Microopticelectromechanical systems (MOEMS), optical elements are also integrated into these devices. MEMS technology holds the promise of significantly miniaturizing, reducing the cost of, and enhancing the performance of many sensors and actuators, evidence its widespread use in the manufacture of accelerometers, ink jet printer heads and various chemical gas sensors. Despite its stellar success in these "killer-applications," MEMS technology has failed to realize the widespread success many had predicted for it. Nonetheless, this technology has recently been explored extensively for new electro-optics applications, specifically in telecommunications for dense wavelength division multiplexing (DWDM) and optical switching. This thesis examines various models of dynamic technology adoption and explores how they apply to MEMS technology. Furthermore, by way of historical comparison to the development of application specific integrated circuit (ASIC), it will identify various developmental similarities. Finally, a unique model outlining the critical driving forces behind the adoption of MEMS technology will be constructed.
by Alan M. Then.
S.M.M.O.T.
Ibrahim, Amr. "Remotely interrogated MEMS pressure sensor". Thesis, University of Glasgow, 2012. http://theses.gla.ac.uk/4149/.
Texto completoHaneef, Ibraheem. "SOI CMOS MEMS flow sensors". Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611843.
Texto completoLi, Li. "MEMS micromirrors for imaging applications". Thesis, University of Strathclyde, 2013. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=19508.
Texto completoFerreira, Anderson Henrique Rodrigues 1983. "Análise eletromecânica do giroscópio MEMS". [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263218.
Texto completoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
Made available in DSpace on 2018-08-23T14:00:55Z (GMT). No. of bitstreams: 1 Ferreira_AndersonHenriqueRodrigues_M.pdf: 13469668 bytes, checksum: 25f9c2a03e6a62e5d1a871b78053c4b1 (MD5) Previous issue date: 2013
Resumo: Este trabalho apresenta uma análise dos problemas físicos associados ao projeto de um sensor inercial giroscópio baseado na tecnologia MEMS (micro-electro-mechanical-system). O dispositivo oferece uma resposta elétrica na forma de uma variação da capacitância devido à força de Coriolis e como consequência obtém-se uma medida da velocidade angular de um sistema. Uma formulação analítica da dinâmica eletromecânica de um giroscópio com dois graus de liberdade é revista e implementada em um programa MATLAB/Simulink (R2011a) ®, onde são obtidas as respostas em deslocamento nos domínios do tempo e da frequência. Para melhorar a capacidade do projeto de sensores inerciais, uma abordagem da análise eletromecânica do giroscópio usando o Método dos Elementos Finitos (MEF) do programa comercial ANSYS 12.0® é apresentada. Neste contexto, dois projetos de giroscópios MEMS encontrados na literatura (giroscópio de ACAR e de NGUYEN) são analisados. Análises estática, modal e harmônica são realizadas e os resultados comparados com aqueles obtidos com os modelos analíticos. A resposta harmônica para o modelo eletromecânico completo de MEF não foi realizada devido à dificuldade de simular análises harmônicas incluindo os elementos de Atuação e Detecção simultaneamente. Para superar este problema o elemento Detector foi substituído por um elemento de mola. Os resultados obtidos no giroscópio de NGUYEN apresentaram boa concordância entre os modelos. Contudo, os resultados com o giroscópio de ACAR apresentaram erros significativos entre os modelos, os quais são oriundos da geometria usada no modelo de MEF que se mostrou flexível em regiões que deveriam ser rígidas. Uma análise estática de diferentes tipos de suspensão elástica para giroscópios MEMS é apresentada no Apêndice B
Abstract: This paper presents an analysis of the physical problems associated with the design of a gyroscope inertial sensor based on MEMS technology (MicroEletroMechanical System). The device gives a response in the form of an electrical capacitance change due to the Coriolis force and as a result obtains a measure of the angular velocity of a system. Analytical formulation of the electromechanical dynamics of a gyroscope with two degrees of freedom is reviewed and implemented in a MATLAB/Simulink (R2011a) ® code, where the displacement responses are obtained in time and frequency domains. To improve the capacity of the inertial sensors design, another electromechanical gyroscope analysis approach using the Finite Element Method (FEM) of commercial software ANSYS ® 12.0 is presented. In this context, two designs of MEMS gyroscopes from the literature (NGUYEN's and ACAR's gyroscopes) are analyzed. Static, modal and harmonic analysis are performed and the results compared with those obtained with the analytical models. The harmonic response for the complete electromechanical model of MEF was not performed due to the inability to run harmonic analysis including Actuator and Detector elements simultaneously. To overcome this difficulty, the Detector element was replaced by a spring element. The results obtained with NGUYEN's gyroscope showed good agreement between the models. However, the results with the ACAR's gyroscope showed significant errors between the models, which are derived from the geometry used in the FEM model, that was flexible to regions that should be rigid. A static analysis of different types of elastic suspension for MEMS gyroscopes are shown in Appendix B
Mestrado
Mecanica dos Sólidos e Projeto Mecanico
Mestre em Engenharia Mecânica
Abadie, André Keller. "Acelerômetro MEMS para navegação inercial". Instituto Tecnológico de Aeronáutica, 2011. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=2002.
Texto completoPekárek, Jan. "Katodové nanostruktury v MEMS aplikacích". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217244.
Texto completoSUN, JING. "THREE-DIMENSIONAL MONOLITHIC MEMS COIL". University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1067624824.
Texto completoChoonee, Kaushal R. V. "MEMS micro-contact printing engines". Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6868.
Texto completoTsai, Jui-che. "MEMS-based wavelength-selective switches". Diss., Restricted to subscribing institutions, 2005. http://proquest.umi.com/pqdweb?did=888861551&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Texto completoAlbahri, Shehab. "Mechanical characterization of MEMS devices". Diss., Online access via UMI:, 2007.
Buscar texto completoAvila, Gomez Adrian Enrique. "Development MEMS Acoustic Emission Sensors". Scholar Commons, 2017. https://scholarcommons.usf.edu/etd/7392.
Texto completo