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Dissertations / Theses on the topic 'Thin film transducers'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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1

Liang, Cai Prorok Barton Charles. "Development of bulk-scale and thin-film magnetostrictive sensor." Auburn, Ala., 2007. http://repo.lib.auburn.edu/EtdRoot/2007/FALL/Materials_Engineering/Dissertation/Liang_Cai_15.pdf.

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2

Morris, I. D. "Radiofrequency studies at low and intermediate temperatures." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236305.

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3

Perez, Cota Fernando. "Opto-acoustic thin-film transducers for imaging of Brillouin oscillations on living cells." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/32946/.

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In any given media, the speed of sound is considerably slower than speed of light, and the exploration of the acoustic regime in the GHz range gives access to very short acoustic wavelengths. Short acoustic wavelengths is an intriguing path for high resolution live-cell imaging. At low frequencies, ultrasound has proved to be a valuable tool for the mechanical characterisation and imaging of biological tissues. There is much interest in using high frequency ultrasound to investigate single cells due to its mechanical contrast mechanism. Mechanical characterisation of cells has been performed b

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4

Johnston, David A. "The use of metal evaporation in the design and manufacture of enzyme electrodes." Thesis, University of the West of Scotland, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323763.

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5

Baker, Karen Irene. "Unsteady surface heat flux and temperature measurements." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-12042009-020124/.

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6

Campbell, David Scott. "Design and calibration of a rapid-response thin-film heat flux gage." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/104303.

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7

Dalakoti, Abhishek. "Optimization of PZT based thin films and piezoelectric micromachined ultrasonic transducers (pMUTs)." Online access for everyone, 2005. http://www.dissertations.wsu.edu/Thesis/Fall2005/a%5Fdalakoti%5F083105.pdf.

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8

Sumner, Claire. "Development of a biosensor based on enzyme-catalysed degradation of thin polymer films." Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341818.

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9

Hayes, Jason Paul. "Laser ablation deposition of magnetoelastic thin films for transducer applications." Thesis, University of Hull, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395425.

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10

Smyth, Katherine Marie. "Design and modeling of a PZT thin film based piezoelectric micromachined ultrasonic transducer (PMUT)." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74942.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 149-156).<br>The design and modelling framework for a piezoelectric micromachined ultrasonic transducer (PMUT) based on the piezoelectric thin film deposition of lead zirconate titanate (PZT) is defined. Through high frequency vibration (1-16MHz) of a thin plate, the PMUT transmits and receives pressure pulses to construct medical ultrasound images as an alternative to bulk piezoelectric transducers currently in use. Ex

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11

Arsat, Rashidah, and rashidah arsat@student rmit edu au. "Investigation of Nanostructured Thin Films on Surface Acoustic Wave and Conductometric Transducers for Gas Sensing Applications." RMIT University. Electrical and Computer Engineering, 2009. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20091002.094407.

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In this thesis, the author proposed and developed nanostructured materials based Surface Acoustic Wave (SAW) and conductometric transducers for gas sensing applications. The device fabrication, nanostructured materials synthesis and characterization, as well as their gas sensing performance have been undertaken. The investigated structures are based on two structures: lithium niobate (LiNbO3) and lithium tantalate (LiTaO3). These two substrates were chosen for their high electromechanical coupling coefficient. The conductometric structure is based on langasite (LGS) substrate. LGS was selected

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12

Arapan, Lilia. "Thin Film Plate Acoustic Resonators for Frequency Control and Sensing Applications." Doctoral thesis, Uppsala universitet, Fasta tillståndets elektronik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-178592.

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The recent development of the commercially viable thin film electro-acoustic technology has triggered a growing interest in the research of plate guided wave or Lamb wave components owing to their unique characteristics. In the present thesis i) an experimental study of the thin film plate resonators (FPAR) performance operating on the lowest symmetrical Lamb wave (S0) propagating in highly textured AlN membranes versus a variety of design parameters has been performed. The S0 mode is excited through an Interdigital Transducer and confined within the structure by means of reflection from metal

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13

Hood, John Paul. "Development of piezoelectric material aluminium nitride as a thin film transducer for the application of high temperature ultrasonic non destructive testing." Thesis, University of the West of Scotland, 2012. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.748624.

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14

Sridi, Nawres. "Etude de membranes ultra-fines pour intégration de transducteurs acoustiques ultra-sonores." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00954586.

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Les travaux de cette thèse se situent dans un contexte de miniaturisation des transducteurs ultrasonores micro-usinés (cMUTs). Ce type de dispositifs est utilisé depuis plusieurs décades dans le domaine de l'imagerie par échographie allant du contrôle non-destructif de structures jusqu'au domaine médical. La quête d'une imagerie hautement résolue nécessite l'utilisation de cMUTs de fréquence de résonance de l'ordre du GHz et de taille micrométrique. L'élément actif de ces cMUts est une membrane suspendue de surface micrométrique. Une étude analytique, basée sur le comportement mécanique des pl

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15

Chadli, Saïd. "Modélisation et réalisation d'un multicapteur microcontrôlé à couches minces, pour la mesure ambulatoire des températures de surface." Rouen, 1993. http://www.theses.fr/1993ROUES037.

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Au cours de cette étude, nous mettons en évidence les différents problèmes qui se posent lorsque l'on désire mesurer la température d'une surface au moyen d'une sonde de contact. Nous proposons une étude théorique du comportement thermophysique d'une sonde active, thermorégulée destinée à la mesure fine, précise et instantanée des températures superficielles. Divers prototypes de transducteurs y sont décrits, aboutissant au modèle coplanaire retenu pour sa fonctionnalité. Nous exposons aussi les procédés qui ont permis la réalisation du transducteur en technologie couches minces. Nous décrivon

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16

"Thin Film Transistor Control Circuitry for MEMS Acoustic Transducers." Master's thesis, 2012. http://hdl.handle.net/2286/R.I.15984.

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abstract: ABSTRACT This work seeks to develop a practical solution for short range ultrasonic communications and produce an integrated array of acoustic transmitters on a flexible substrate. This is done using flexible thin film transistor (TFT) and micro electromechanical systems (MEMS). The goal is to develop a flexible system capable of communicating in the ultrasonic frequency range at a distance of 10 - 100 meters. This requires a great deal of innovation on the part of the FDC team developing the TFT driving circuitry and the MEMS team adapting the technology for fabrication on a flexibl

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17

Chang, Wei-Tsai, and 張瑋才. "Study of thin-film piezoelectric transducers for vibration-energy harvesting." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/10863201117593879296.

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博士<br>國立中山大學<br>電機工程學系研究所<br>100<br>The piezoelectric transducer for vibration-energy harvesting is constructed of a piezoelectric layer, bottom electrode and a top electrode. In order to obtain an appropriate transducer for the low-frequency operating; environmentally-friendly and long-term, the flexible substrate, the piezoelectric layer, and the additional mass-loading (tip mass) have been investigated thoroughly. This study investigates the feasibility of a high-performance ZnO and AlN based piezoelectric transducer for vibration-energy harvesting applications. Firstly, the piezoelectric t

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18

Liang, Yen, and 梁彥. "Low Frequency Characteristics of ZnO Thin Film Piezoelectric Transducers on PET Substrate." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/47110250027228771431.

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碩士<br>中原大學<br>電子工程研究所<br>99<br>Zinc oxide (ZnO), is popular in recent years in various fields of research material, the paper by RF reactive magnetron sputtering system, the growth conditions at room temperature, deposited on commercially available ITO / PET substrate deposition zinc oxide thin films, combined with easy processing and completion of the piezoelectric transducer element; by X-ray diffraction experiments that can be prepared zinc oxide with C-axis (002) prefer orientation in the FE-SEM measurements under that film thickness and deposition rate of the Calculate is about 150nm/HR,

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19

Mao, Chun-Kai, and 毛俊凱. "Dual-mode ZnO thin films for piezoelectric transducers." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/24823010445582772854.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>100<br>The purpose of this thesis is to study the c-axis inclined ZnO films to produce dual-mode thin-film piezoelectric transducer. The cantilever beam vibration theory as a power generation mode in adopted to verify that the transducer is in suitable for the application in the environment for low-frequency vibration. In order to develop dual-mode thin-film piezoelectric transducer, this study uses radio-frequency magnetron sputtering method with off-axis growth to deposit ZnO films on Pt/Ti/stainless steel substrate(SUS304), the effects of deposition parameters o

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20

Lin, Wan-Yao, and 林宛瑤. "The growth of ZnO thin films and the application study of thepiezoelectric transducers." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/22165245798517260026.

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碩士<br>中原大學<br>電子工程研究所<br>101<br>In this thesis, the zinc oxide (ZnO) films were deposited on ITO/PET substrate at room temperature by a magnetron reactive sputtering system. The effects of oxygen ratio on the structure of ZnO films were studied. X-ray diffraction (XRD) and Field-Emission Scanning electron microscopy (FE-SEM) were employed to characterize the crystallinity and film growth rate. All ZnO films exhibit columnar structure and preferred orientated with c-axis perpendicular to substrates. The optimal deposition parameters for ZnO films are sputtering pressure of 15mTorr, RF power of

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21

Huang, Guo-Tsai. "Evaluation of Material Properties of Sub-Micrometer Thin Films Using Slanted Finger Interdigital Transducers." 2004. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-3107200410545600.

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22

Huang, Yu-Chang, and 黃煜昌. "Investigation of ZnO Thin Films Deposited on Stainless Steel Substrates for Piezoelectric Transducers Application." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/73561170797874392896.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>98<br>This study presents a high-performance ZnO piezoelectric transducer integrated with the flexible stainless steel substrate. The ZnO piezoelectric film of 1.08nm was deposited on the flexible stainless steel substrate using a RF magnetron sputtering system. The cantilever length of 1cm and the vibration area of 1cm2 were designed for low-frequency environment according to the Cantilever Vibration Theory. The effects of various sputtering parameters such as substrate temperature, RF power and sputtering pressure were investigated to improve the piezoelectric ch

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23

Huang, Guo-Tsai, and 黃國財. "Evaluation of Material Properties of Sub-Micrometer Thin Films Using Slanted Finger Interdigital Transducers." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/24257690327170576747.

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碩士<br>國立臺灣大學<br>應用力學研究所<br>92<br>Accurate monitoring of the thickness and elastic properties of thin films with thickness in the sub-micrometer range is very important in the area of N/MEMS fabrication. In this thesis, we utilize a RF surface acoustic wave (SAW) device to measure the dispersion of SAW in a thin film deposited layered substrate first, and then, determine the elastic properties of the thin film inversely through an optimization algorithm. Firstly, we analyze the dispersion of SAW in a SiO2/YZ-LiNbO3 layered specimen and serve as the forward solution of the inverse ev

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24

Jayaraman, Balaji. "Modular Design Of Microheaters, Signal Conditioning ASIC And ZnO Transducer For Gas Sensor System Platform." Thesis, 2011. http://etd.iisc.ernet.in/handle/2005/2115.

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With the proliferation of industries world-wide, there is a growing need and interest in sensing and monitoring environmental pollutants and monitoring the concentration of chemicals/gases in industrial process control. There is also an increasing demand for chemical sensors in other applications such as home security, breath analysis and food processing. Design and development of metal-oxide based gas sensor system is reported in this thesis. The system consists of three components viz. micro heater(which aids inheating the sensor film to required temperatures), CMOS ASIC (the sensor interfa

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25

Rathod, Vivek T. "Ultrasonic Guided Wave Based Models, Devices and Methods for Integrated Structural Health Monitoring." Thesis, 2014. http://hdl.handle.net/2005/3054.

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Structural Health Monitoring (SHM) systems for future structures and vehicles would involve a process of damage identification and prediction of certain quantities of interest that concerns the function and safety. This process provides SHM systems the ability to not only save cost but also enhance the service life, safety and reliability of the structures and vehicles. Integrated SHM system (ISHM) is an advancement of SHM system that has additional capability of predicting the component life/failure. ISHM system development involves detailed understanding of diagnostic waves, hardware compone

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