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Dissertations / Theses on the topic 'Transducers'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Sotoudeh, A. "Transducer compensation in digital instruments : 'Intelligent' transducers." Thesis, University of Southampton, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370375.

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2

Magliocchetti, Mario. "Improving the performance of MiniCan low noise hydrophone." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FMagliocchetti.pdf.

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3

Cooper, Philip George. "Vibrotactile transducers." Thesis, University of Exeter, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240329.

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4

Wiszniewski, Witold Roman. "Silicon transducers." Thesis, The University of Sydney, 1994. https://hdl.handle.net/2123/26700.

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The thesis presents a work on micromechanical transducers: infrared detectors and a light modulator; fabricated on a silicon chip using SLMOX (Separation by IMplantation of OXygen) implantation. The devices are built using a double supported beam of typical dimensions: length 100 um; width 7 pm; thickness 0.5 pm and air gap 0.4 um; composed of silicon nitride and SIMOX silicon layers. The high tensile stress of Si3N4 provides stability of the beam. The one-dimensional, analytical analysis of the beam shows that the first resonance frequency and pull-in (collapse) voltage are determined not by

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5

Servais, Frédéric. "Visibly pushdown transducers." Doctoral thesis, Universite Libre de Bruxelles, 2011. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209865.

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The present work proposes visibly pushdown transducers (VPTs) for defining transformations of documents with a nesting structure. We show that this subclass of pushdown transducers enjoy good properties. Notably, we show that functionality is decidable in PTime and k-valuedness in co-NPTime. While this class is not closed under composition and its type checking problem against visibly pushdown automata is undecidable, we identify a subclass, the well-nested VPTs, closed under composition and with a decidable type checking problem. Furthermore, we show that the class of VPTs is closed under loo

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6

Akle, Barbar Jawad. "Multilayer Ionic Transducers." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/31733.

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A transducer consisting of multiple layers of ionic polymer material is developed for applications in sensing, actuation, and control. The transducer consists of two to four individual layers each approximately 200 microns thick. The transducers are connected in parallel to minimize the electric field requirements for actuation. The tradeoff in deflection and force can be controlled by controlling the mechanical constraint at the interface. Packaging the transducer in an outer coating produces a hard constraint between layers and reduces the deflection with a force that increases linearly with

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7

Villevalois, Didier. "Simplifying transducers using sequentiality." Electronic Thesis or Diss., Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0441.

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La synthèse est un domaine de l'informatique consistant à générer des programmes à partir de spécifications abstraites. Les spécifications sont souvent décrites à l'aide d'un formalisme logique et les programmes sont obtenus sous la forme de modèles de transformation. Alors qu'il est utile de pouvoir exprimer les propriétés des spécifications avec du non-déterminisme, nous souhaitons en général obtenir des modèles déterministes pour des raisons évidentes d'efficacité. Ceci nous amène à vouloir simplifier les modèles synthétisés afin d'optimiser leur évaluation ou leur représentation concrète d

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8

Senesi, Matteo. "Frequency steerable acoustic transducers." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44819.

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Structural health monitoring (SHM) is an active research area devoted to the assessment of the structural integrity of critical components of aerospace, civil and mechanical systems. Guided wave methods have been proposed for SHM of plate-like structures using permanently attached piezoelectric transducers, which generate and sense waves to evaluate the presence of damage. Effective interrogation of structural health is often facilitated by sensors and actuators with the ability to perform directional scanning. In this research, the novel class of Frequency Steerable Acoustic Transducers (FSAT

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9

Al-Chami, Hussein. "Inkjet printing of transducers." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/28260.

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In the past few years, inkjet printing has been emerging as a cost effective, environment friendly, net-shape microfabrication technique. This non-contact deposition technique facilitated the deposition of metallic and polymeric inks, biological proteins, and cells. The present work investigates the inkjet printing of microtransducers, with a focus on stress-sensing and movable microstructures. Piezoresistive and interdigitated capacitor based strain gauges were printed and tested. The inexpensive conductive polymer, poly(3,4-ethylenedioxythiophene) oxidized with poly(styrenesulfonate) (PEDOT:

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10

Sylvan, Keith. "RF electrolytic conductivity transducers." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/11450.

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11

Jecker, Ismaël Robin. "Algorithmic Properties of Transducers." Doctoral thesis, Universite Libre de Bruxelles, 2019. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/286313.

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In this thesis, we consider three fundamental problems of transducers theory. The containment problem asks, given two transducers,whether the relation defined by the first is included into the relation defined by the second. The equivalence problem asks, given two transducers,whether they define the same relation. Finally, the sequential uniformisation problem,corresponding to the synthesis problem in the setting of transducers,asks, given a transducer, whether it is possible to deterministically pick an output correspondingto each input of its domain. These three decision problems are undecid

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12

Paul, Van Emburg David. "Finite element model of a capacitive transducer for measuring surface motion." Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/17553.

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13

Chew, Zheng Jun. "Integrated transducers and nanostructure synthesis." Thesis, Swansea University, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.678389.

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14

Wijesiriwardana, Ravindra. "Novel knitted fibre-meshed transducers." Thesis, University of Manchester, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556498.

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This thesis discusses the construction, analysis, performance and applications of "Novel Knitted Fibre Meshed Transducers" (KFMTs). Unobtrusive transducers play a major role in the wearable computing field. These transducers are being used in wearable personalized monitoring systems. Common practice is to embed sensors that are made separately into garments at a later stage, and therefore, these systems are not truly unobtrusive in nature. To overcome these disadvantages a new generation of more robust and unobtrusive sensors is required. One scenario is to make such sensors by using smart mat

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15

Wu, Zhengbin. "Bondlines in piezoelectric ultrasonic transducers." Thesis, University of the West of Scotland, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427721.

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16

Carr, Hilary. "Electrostatic transducers for airborne ultrasonics." Thesis, University of Nottingham, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254254.

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17

Shi, Wen Juan. "Dynamic frequency compensation for transducers." Thesis, University of Southampton, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316439.

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18

Alcock, Robin D. "Transducers for measuring acoustic transients." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/32473.

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This thesis is concerned with the design and development of measuring devices for the characterisation of acoustic transients with high temporal and spatial resolution. Three new techniques are demonstrated characterising acoustic transients generated by Nd-YAG laser (1060nm, 30ns, 55mJ) assisted breakdown of water and air. The first technique demonstrates the use of a high power semiconductor laser in a high speed multiple exposure imaging system. This system developed is capable of illuminating an event with up to 10 pulses of light at a maximum repetition rate of 5MHz, with a timing accurac

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19

Aoki, Yohko. "Strain transducers for active control." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/66297/.

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This thesis presents the results of a theoretical and experimental study of active vibration control using velocity feedback with piezoceramic actuator(s) and closely located velocity sensor(s). The first part of the thesis presents modeling and design studies for a square piezoceramic actuator used to implement a single channel velocity feedback control with a velocity sensor at its center. A fully coupled mobility model of the panel with a square piezoceramic patch actuator is introduced and experimentally validated in order to predict the sensor-actuator open loop response over much wider f

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20

Bazilo, C. V., V. M. Zaika, Yu Yu Bondarenko, Yu A. Petrushko, and L. O. Fedoruk. "Piezoelectric Transducers for Ultrasonic Surgery." Thesis, Sumy State University, 2017. http://essuir.sumdu.edu.ua/handle/123456789/65125.

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To enhance the acoustic oscillations it is proposed to place piezoelectric elements on a scalpel in such way to have an angle between the electric field vector of the excitation voltage and the polarization vector.

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21

Ribichini, Remo. "Modelling of electromagnetic acoustic transducers." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/9010.

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At present, the dominant technology for transducers in the field of Ultrasonic Non-Destructive Testing is piezoelectric. However, some industrially important applications, like the inspection of components operating at high temperature or while in motion, are difficult tasks for standard piezoelectric probes since mechanical contact is required. In these cases, contactless NDT techniques can be an attractive alternative. Among the available options, Electromagnetic Acoustic Transducers (EMATs) can generate and detect ultrasonic waves without the need for a physical contact between the probe an

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22

Guillon, B. "Two-wayness: Automata and Transducers." Doctoral thesis, Università degli Studi di Milano, 2016. http://hdl.handle.net/2434/385609.

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This PhD is about two natural extensions of Finite Automata (FA): the 2-way fa (2FA) and the 2-way transducers (2T). It is well known that 2FA s are computably equivalent to FAs, even in their nondeterministic (2nfa) variant. However, in the field of descriptional complexity, some questions remain. Raised by Sakoda and Sipser in 1978, the question of the cost of the simulation of 2NFA by 2DFA (the deterministic variant of 2FA) is still open. In this manuscript, we give an answer in a restricted case in which the nondeterministic choices of the simulated 2NFA may occur at the boundaries of

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23

Guillon, Bruno. "Two-wayness : automata and transducers." Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCC339.

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Cette thèse porte sur deux extensions naturelles des Automates Finis (FA) : les automates finis bidirectionnels (2FA) et les transducteurs bidirectionnels (2T). Il est bien connu que les 2FA sont calculatoirement équivalents aux FA, même dans leur version non déterministe (2NFA). Cependant, dans le domaine de la complexité descriptionnelle, certaines questions demeurent. Posée par Sakoda et Sipser en 1978, la question du coût de la simulation d'un 2NFA par 2DFA (D pour déterministe) est encore inconnue. Dans cette thèse, je traite cette question dans un cas restreint où les choix non détermini

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24

Namboodri, Chettoor G. "Experimental investigation and modeling of the electrostrictive relaxor ferroelectric lead magnesium niobate-lead titinate." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-07212009-040304/.

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25

Wang, Weijian. "Electrode shape optimization of piezoelectric transducers." [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0001041.

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26

Cardinal, Patrick. "Finite-state transducers and speech recognition." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=78335.

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Finite-state automata and finite-state transducers have been extensively studied over the years. Recently, the theory of transducers has been generalized by Mohri for the weighted case. This generalization has allowed the use of finite-state transducers in a large variety of applications such as speech recognition. In this work, most of the algorithms for performing operations on weighted finite-state transducers are described in detail and analyzed. Then, an example of their use is given via a description of a speech recognition system based on them.

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27

Bradley, Robert John. "Capacitive ultrasonic transducers fabricated using microstereolithography." Thesis, University of Warwick, 2007. http://wrap.warwick.ac.uk/2400/.

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Air-coupled thin-membrane capacitive ultrasonic transducers have been developed that use microstereolithography fabrication with architectures comprised entirely of partially metalised photopolymer. These devices derive considerable advantages from rapid prototyping technology, in that they are cheap to produce, and benefit from the design-to-product lead times inherent in the production of components using stereolithography. To date membranes have been produced with thicknesses ranging from 30 to 90 μm with aspect ratios in the range of 100 - 1000. These devices have been shown to operate bot

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28

Walmsley, P. "New transducers in underwater noise measurements." Thesis, University of Bradford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371488.

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29

TrogeÌ, Alexandre. "A new range of ultrasonic transducers." Thesis, University of Strathclyde, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438139.

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30

Carrara, Matteo. "Fourier-based design of acoustic transducers." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54925.

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The work presented in this thesis investigates novel transducer implementations that take advantage of directional sensing and generation of acoustic waves. These transducers are conceived by exploiting a Fourier-based design methodology. The proposed devices find application in the broad field of Structural Health Monitoring (SHM), which is a very active research area devoted to the assessment of the structural integrity of critical components in aerospace, civil and mechanical systems. Among SHM schemes, Guided Waves (GWs) testing has emerged as a prominent option for inspection of plate-lik

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31

Bazilo, C. V., and Yu A. Petrushko. "Electroacoustic Transducers for Diagnostic Automatic Systems." Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/46400.

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Using the proposed scheme allowed to increase the level of output sound pressure of the transducer by about 12 dB compared with the prototype. Received information can be used in electroacoustic transducers designing.

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32

Mayer, J. Bertrand. "Ultrasonic transducers for wideband attenuation measurements." Master's thesis, University of Cape Town, 1987. http://hdl.handle.net/11427/8359.

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Includes bibliographical references.<br>An application of ultrasound presently being investigated at the Council for Mineral Technology {MINTEK) is the measurement of the concentration of graphite particles in suspension in an agitated pulp. The principle of the measurement is based on the attenuation characteristics of the medium over a frequency range extending from 0.1 MHz to 10 MHz. This wide range and the highly attenuating medium (typically 3 dB/cm) require therefore that the ultrasonic transducers exhibit efficient wideband characteristics. Piezoceramic transducers vibrating in thicknes

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33

Orono, Lisa Lorraine. "Novel sensor for rapid detection of blood cell types magnetostrictive microcantilevers /." Auburn, Ala., 2005. http://repo.lib.auburn.edu/2005%20Summer/master's/ORONA_LISA_41.pdf.

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34

Paschero, Maurizio. "Modeling and synthesis of circuits analogue to generalized ondulatory phenomena giroscopically coupled." Doctoral thesis, La Sapienza, 2007. http://hdl.handle.net/11573/916985.

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35

Llobera, Adan Andreu. "Integrated Optics Technology on Silicon: Optical Transducers." Doctoral thesis, Universitat Autònoma de Barcelona, 2002. http://hdl.handle.net/10803/3342.

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El camp de l'òptica integrada es presenta com un dels mes prometedors a curt-mig plaç degut als clars avantatges que presenta amb respecte de l'electrònica tradicional. El fet d'utilitzar la llum com a medi vehicular, la qual no es veu afectada per les possibles pertorbacions electromagnètiques, entre altres propietats, fan que aquest camp sigui una de les sortides mes viables als greus problemes de congestió de les vies de telecomunicacions que es preveuen en un futur proper. Per altra part, l'ús de l'òptica integrada per a la realització de sensors ofereix unes prestacions superiors a la maj

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36

Vogel, Stephan. "Statistical machine translation with cascaded probabilistic transducers." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=984997555.

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37

Vázquez, Carazo Alfredo. "Novel piezoelectric transducers for high voltage measurements." Doctoral thesis, Universitat Politècnica de Catalunya, 2000. http://hdl.handle.net/10803/6285.

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A prerequisite for safe and stable operation of an electric power system is the accurate and reliable measurement of the system parameters, in particular, current and voltage. Conventionally, this has been achieved on High Voltage (H.V.) systems by expensive, bulky iron-core transformers and also by capacitor transformers. Both of them are increasingly coming under review (chapter 1) in modern power system due to their cost, safety implications for personnel and surrounding plant if failure occurs, installation time and indeed substation land requirements. Research effort into viable alternati

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38

Jürgensen, Claus. "Categorical semantics and composition of tree transducers." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=974221376.

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39

Yap, Ngee Thai. "Modeling syllable theory with finite-state transducers." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 279 p, 2006. http://proquest.umi.com/pqdweb?did=1179954391&sid=4&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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40

Jürgensen, Claus. "Categorical semantics and composition of tree transducers." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2004. http://nbn-resolving.de/urn:nbn:de:swb:14-1107164334013-70165.

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In this thesis we see two new approaches to compose tree transducers and more general to fuse functional programs. The first abroach is based on initial algebras. We prove a new variant of the acid rain theorem for mutually recursive functions where the build function is substituted by a concrete functor. Moreover, we give a symmetric form (i.e. consumer and producer have the same syntactic form) of our new acid rain theorem where fusion is composition in a category and thus in particular associative. Applying this to compose top-down tree transducers yields the same result (on a syntactic lev

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41

Cepni, Kerim. "A Methodology For Designing Tonpilz-type Transducers." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613526/index.pdf.

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Tonpilz-type transducers are the most commonly used projectors in underwater acoustic applications. However, no complete design approach is available in the literature for such transducers. The present study aims to fill this gap in the literature by providing a systematic design approach for the Tonpilz-type transducers. The proposed methodology involves the use of different analytical models and a finite element model of such transducers. Each model provides a different level of accuracy that is tightly correlated with the models complexity and computational cost. By using these models seque

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42

Nygren, Morten Wollert. "Finite Element Modeling of Piezoelectric Ultrasonic Transducers." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12411.

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The optimization of piezoelectric ultrasonic transducers has tradisionally been done through trial and error, somewhat guided by one-dimentional simulations. This can often be a very time-consuming and expensive process, hence a more extensive simulation method is desired.A series of finite element models of piezoelectric ultrasonic transducer has been made in COMSOL Multiphysics. The initial models were designed to emulate the conditions assumed in a one-dimentional transducer model, and their validity could thus be confirmed by said model. Later models did not emulate these conditions, and a

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43

Pettersson, Sara, and Helena Gistvik. "Effects of dead elements in ultrasound transducers." Thesis, KTH, Skolan för teknik och hälsa (STH), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-124153.

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Ultrasound is a common modality used in healthcare today. The ultrasound images can be used as a diagnostic tool and the image quality is therefore important. Earlier studies have shown that transducers used clinically are often damaged; a type of damage is dead elements in the transducer. In this study, it has been evaluated how the number and the placement of the dead elements impact the beam profile and how this is reflected in the image quality. This has been performed with two types of simulations, one simulated beam profiles and the other simulated dead elements in a transducer used to c

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44

Koosha, Abdolrahim. "Ultrasonic transducers for air and underwater communication." Thesis, Kingston University, 1991. http://eprints.kingston.ac.uk/20553/.

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The performance of a novel radiator capable of producing ultrasonic waves in air and liquids has been investigated. For commercial transducers when operating in air or liquids, impedance matching is the necessary condition for maximum transfer of energy to the medium (thus no standing waves are involved). 'However, "for this radiator the formation of the mechanical standing waves on it is the key condition for directional radiation of energy into the surrounding environment. Under this condition the radiator exhibits a practical conversion of electrical energy into ultrasound. To further impro

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45

Hossack, John A. "Modelling techniques for 1-3 composite transducers." Thesis, University of Strathclyde, 1990. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=20384.

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A selection of novel modelling techniques are presented for predicting the behaviour of a thickness mode composite piezoelectric transducer comprising an array of ceramic pillars embedded in a polymer matrix. Finite element analysis is employed to establish the vibrational and electromechanical characteristics of an arbitrary composite structure. Thereafter, the equivalent thickness mode transducer parameters are employed in a modified transducer model to establish the impedance, transmission and reception characteristics. A novel algorithm for calculating the acoustic pressure profile, result

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46

Lawrow, Alexander. "Domain-inverted transducers for acousto-optic devices." Thesis, University of Kent, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267423.

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47

McIntyre, Craig Stewart. "The development of air-coupled ultrasonic transducers." Thesis, University of Warwick, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343184.

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48

Chen, Qing-Xin. "On ferroelectric polymer transducers and imaging arrays." Thesis, University of Manchester, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303406.

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49

Gatcombe, Christopher Peter. "Computer modelling of high resolution ultrasonic transducers." Thesis, City University London, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236597.

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50

Duval, Fabrice. "PZT thick films for high frequency transducers." Thesis, Cranfield University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396987.

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