Relevant bibliographies by topics / Transducer

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Transducer'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 October 2023

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Journal articles on the topic "Transducer"

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Yang, Qing Feng, Peng Wang, Yu Hong Wang, and Kai Zhang. "Simulation Analysis on Cymbal Transducer." Advanced Engineering Forum 2-3 (December 2011): 140–43. http://dx.doi.org/10.4028/www.scientific.net/aef.2-3.140.

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The resonance frequency of the cymbal transducer ranges from 2kHz to 40kHz and its effective electromechanical coupling factor is around 20%. Finite element analysis has been performed to ascertain how the transducer’s makeup affect the transducer’s performance parameters. Two-dimensional axisymmetric model of the cymbal transducer was founded by finite element software-ANSYS, the application of the element type was discussed and the FEM models were built up under the far field condition. Eight groups of cymbal transducers of resonance frequency around 3kHz with different structural dimensions were designed. It was better for choosing the cymbal transducer of the 8mm cavity coping diameter, 20.8mm cavity bottom diameter and 26.8mm piezoelectric ceramic wafer diameter than others for reducing distortion degree of the signal and improving communication turnover in the researched cymbal transducers. It was appropriate for choosing the cymbal transducer of the 8mm cavity coping diameter, 22.4mm cavity bottom diameter and 26.4mm piezoelectric ceramic wafer diameter in order to improve the free-field voltage sensitivity and transmission efficient.
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Geng, Jie, Quan Lu Li, Jing Wu, Qing Qing Yang, and Hai Xia Chen. "The Performance and Material Selection of Medical Ultrasonic Transducer." Advanced Materials Research 340 (September 2011): 456–60. http://dx.doi.org/10.4028/www.scientific.net/amr.340.456.

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With the accelerating pace of mordern medicine, the various transducers that applicat in clinical diagnosis are also more and more, most medical ultrasonic transducer using acoustoelectric transducer to emiting and receiving of ultrasonic wave. However, the selection of transducer’s material is very important to the performance of medical ultrasonic transducer. This paper describes structures and properties of the medical ultrasonic transducer, and a variety of quantitative indicators that influence its performance. Aim to work out the most appropriate material for making the medical ultrasonic transducer.
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Kong, Huan Ping, Zheng Zhang, and Li Fei Li. "Factors Influencing Acousto-Ultrasonic Approach to Impact Damage in Composite Materials." Advanced Materials Research 393-395 (November 2011): 97–101. http://dx.doi.org/10.4028/www.scientific.net/amr.393-395.97.

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This paper studied factors influencing AU detection results on different damage specimens, including simulation frequency, transducer modes and transducer location. Correlation between acousto-ultrasonic parameters (AUP1, AUP2) and impact damage severity in composite was investigated. The results showed that as damage severity increased, AUP1 and AUP2 of three different transducers decreased. Applying low frequency transducer, the variation of AUP1 may indicate a more rapid detection prospect. In addition, applying S1-transducer and WD-transducer, AUP2 was more effective for the early damage detection. Varying transducer’s location, S1-transducer applying 500khz simulation frequency presented a valuable results.
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Klaus, Leonard, Barbora Arendacká, Michael Kobusch, and Thomas Bruns. "Dynamic torque calibration by means of model parameter identification." ACTA IMEKO 4, no. 2 (June 29, 2015): 39. http://dx.doi.org/10.21014/acta_imeko.v4i2.211.

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For the dynamic calibration of torque transducers, a model of the transducer and an extended model of the mounted transducer including the measuring device have been developed. The dynamic behaviour of a torque transducer under test is going to be described by its model parameters. This paper describes the models with these known and unknown parameters and how the calibration measurements are going to be carried out. The principle for the identification of the transducer's model parameters from measurement data is described using a least squares approach. The influence of a variation of the transducer's parameters on the frequency response of the expanded model is analysed.
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Hegazy, Riham, Gouda Mohammad, and Magdy Ibrahim Mohamed. "Extrapolation errors of force transducer curve fitting equations." Universitas Scientiarum 27, no. 3 (December 12, 2022): 315–31. http://dx.doi.org/10.11144/javeriana.sc273.eeof.

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Calibration laboratories often face the challenge of the impossibility to perform full capacity range calibration of their force transducers, particularly below 10 % of the force transducer’s capacity. Sometimes these laboratories use curve fitting extrapolation to estimate and predict force transducer behavior within uncalibrated capacity ranges. This work deals with the study of extrapolation errors in force transducers to know and estimate prediction accuracies when using extrapolation for force transducer calibration in ranges below 10 % and between 50 % and 100 % of the transducer’s capacity. The results of this study showed that the magnitude of the extrapolation error is very close to the magnitude of the reproducibility error within calibrated capacity ranges in the laboratory.
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Nguyen, Thanh Phuoc, Jaeyeop Choi, Van Tu Nguyen, Sudip Mondal, Ngoc Thang Bui, Dinh Dat Vu, Sumin Park, and Junghwan Oh. "Design and Micro-Fabrication of Focused High-Frequency Needle Transducers for Medical Imaging." Sensors 22, no. 10 (May 15, 2022): 3763. http://dx.doi.org/10.3390/s22103763.

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In this study, we report an advanced fabrication technique to develop a miniature focused needle transducer. Two different types of high-frequency (100 MHz) transducers were fabricated using the lead magnesium niobate-lead titanate (PMN-0.3PT) and lithium niobate (LiNbO3) single crystals. In order to enhance the transducer’s performance, a unique mass–spring matching layer technique was adopted, in which gold and parylene play the roles of the mass layer and spring layer, respectively. The PMN-0.3PT transducer had a 103 MHz center frequency with a −6 dB bandwidth of 52%, and a signal-to-noise ratio (SNR) of 42 dB. The center frequency, −6 dB bandwidth, and SNR of the LiNbO3 transducer were 105 MHz, 66%, and 44 dB, respectively. In order to compare and evaluate the transducers’ performances, an ultrasonic biomicroscopy (UBM) imaging on the fish eye was performed. The results showed that the LiNbO3 transducer had a better contrast resolution compared to the PMN-0.3PT transducer. The fabricated transducer showed an excellent performance with high-resolution corneal epithelium imaging of the experimental fish eye. These interesting findings are useful for the future biomedical implementation of the fabricated transducers in the field of high-resolution ultrasound imaging and diagnosis purpose.
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Wolterink, Tom A. W., Robin D. Buijs, Giampiero Gerini, A. Femius Koenderink, and Ewold Verhagen. "Localizing nanoscale objects using nanophotonic near-field transducers." Nanophotonics 10, no. 6 (March 12, 2021): 1723–32. http://dx.doi.org/10.1515/nanoph-2020-0669.

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Abstract We study how nanophotonic structures can be used for determining the position of a nearby nanoscale object with subwavelength accuracy. Through perturbing the near-field environment of a metasurface transducer consisting of nano-apertures in a metallic film, the location of the nanoscale object is transduced into the transducer’s far-field optical response. By monitoring the scattering pattern of the nanophotonic near-field transducer and comparing it to measured reference data, we demonstrate the two-dimensional localization of the object accurate to 24 nm across an area of 2 × 2 μm. We find that adding complexity to the nanophotonic transducer allows localization over a larger area while maintaining resolution, as it enables encoding more information on the position of the object in the transducer’s far-field response.
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Liu, Houguang, Shirong Ge, Gang Cheng, Jianhua Yang, Zhushi Rao, and Xinsheng Huang. "Transducer Type and Design Influence on the Hearing Loss Compensation Behaviour of the Electromagnetic Middle Ear Implant in a Finite Element Analysis." Advances in Mechanical Engineering 6 (January 1, 2014): 867108. http://dx.doi.org/10.1155/2014/867108.

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Several types of electromagnetic transducer for the middle ear implants (MEIs) have been developed as an alternative to conventional hearing aids for the rehabilitation of sensorineural hearing loss. Electromagnetic transducer type and design are thought to have a significant influence on their hearing compensation performance. To investigate these effects, a middle ear computational model was constructed based on a complete set of microcomputerized tomography section images of a human ear. Its validity was confirmed by comparing the model predicted motions with published experimental measurements. The result shows that the eardrum driving transducer (EDT) is superior to the floating mass transducer (FMT) in hearing compensation when the transducer mass is small but inferior to the FMT when the mass gets bigger. The incus body driving transducer (IBDT) is the most ineffective type of transducer for hearing compensation. Moreover, the masses of the EDT and the FMT decrease the transducer performance mainly at higher frequencies: the greater the transducer mass, the lower the displacement of the stapes excited by these transducers. On the other hand, the IBDT driving rod stiffness decreases transducer's performance severely at low frequencies and its adverse effect on transducer performance increases with the decrease of the stiffness of the IBDT driving rod.
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Bogdan, Mihai. "About the Smart Weather Station." ACTA Universitatis Cibiniensis 68, no. 1 (December 1, 2016): 26–29. http://dx.doi.org/10.1515/aucts-2016-0006.

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Abstract Until recently, the Romanian weather stations utilized ordinary transducers that acquire useful information related to the desired physical inputs. These inputs will be converted into electrical signals easy to be processed by analog to digital converters. This paper proposed a new approach based on smart sensors system that change the interior behavior in order to optimize data acquirements from the environment. The smart sensor characteristics are stored into himself in a transducer electronic data sheet form (TEDS). The intelligent transducer generat together with the measured analogic signal also a digital interface. Through this interface the transducer’s catalog data can be read from the transducer.
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Nguyen, Thanh Phuoc, Van Tu Nguyen, Sudip Mondal, Van Hiep Pham, Dinh Dat Vu, Byung-Gak Kim, and Junghwan Oh. "Improved Depth-of-Field Photoacoustic Microscopy with a Multifocal Point Transducer for Biomedical Imaging." Sensors 20, no. 7 (April 3, 2020): 2020. http://dx.doi.org/10.3390/s20072020.

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In this study, a photoacoustic microscopy (PAM) system based on a multifocal point (MFP) transducer was fabricated to produce a large depth-of-field tissue image. The customized MFP transducer has seven focal points, distributed along with the transducer’s axis, fabricated by separate spherically-focused surfaces. These surfaces generate distinct focal zones that are overlapped to extend the depth-of-field. This design allows extending the focal zone of 10 mm for the 11 MHz MFP transducer, which is a great improvement over the 0.48 mm focal zone of the 11 MHz single focal point (SFP) transducer. The PAM image penetration depths of a chicken-hemoglobin phantom using SFP and MFP transducers were measured as 5 mm and 8 mm, respectively. The significant increase in the PAM image-based penetration depth of the chicken-hemoglobin phantom was a result of using the customized MFP transducer.
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Dissertations / Theses on the topic "Transducer"

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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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Dolzhenko, Egor. "Transducer dynamics." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002380.

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Dolzhenko, Egor. "Transducer dynamics." Scholar Commons, 2007. https://scholarcommons.usf.edu/etd/217.

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Transducers are finite state automata with an output. In this thesis, we attempt to classify sequences that can be constructed by iteratively applying a transducer to a given word. We begin exploring this problem by considering sequences of words that can be produced by iterative application of a transducer to a given input word, i.e., identifying sequences of words of the form w, t(w), t²(w), . . . We call such sequences transducer recognizable. Also we introduce the notion of "recognition of a sequence in context", which captures the possibility of concatenating prefix and suffix words to each word in the sequence, so a given sequence of words becomes transducer recognizable. It turns out that all finite and periodic sequences of words of equal length are transducer recognizable. We also show how to construct a deterministic transducer with the least number of states recognizing a given sequence. To each transducer t we associate a two-dimensional language L²(t) consisting of blocks of symbols in the following way. The first row, w, of each block is in the input language of t, the second row is a word that t outputs on input w. Inductively, every subsequent row is a word outputted by the transducer when its preceding row is read as an input. We show a relationship of the entropy values of these two-dimensional languages to the entropy values of the one-dimensional languages that appear as input languages for finite state transducers.
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Marshall, Laurie D. "Transducer-baffle interaction." Thesis, Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/15821.

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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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Ersagun, Erdem. "Multi-transducer Ultrasonic Communication." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610403/index.pdf.

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RF and acoustic communications are widely used in terrestrial and underwater environments, respectively. This thesis examines the use of ultrasonic communication alternately in terrestrial applications. We first investigate the ultrasonic channel in order to observe whether reliable communication is possible among the ultrasonic nodes as an alternative to RF-based communications. Some key characteristics of the single-input-single-output (SISO) and single-inputmultiple- output (SIMO) ultrasonic channel are inspected with extensive experiments utilizing ultrasonic transmitters and receivers. Well known receiver diversity techniques are employed to combine the observations of multiple receiving ultrasonic transducers in a SIMO scheme and receiver diversity gain is attained. The thesis also covers the implementation of a receiver node by using a low-cost microcontroller.
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Narayanan, Soundararajan Hari. "Torque transducer sensitivity study." Thesis, KTH, Maskinkonstruktion (Inst.), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-183048.

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A torque transducer or a torque sensor is a device for measuring and recording the torque on a rotating system. Torque transducers usually employ strain gauges to measure the torsional moment applied to a rotating shaft.It is to be noted that for an ideal torque transducer, it should measure only the strain that is caused by a torque. Strain due to bending load should be compensated as per the Wheatstone bridge arrangement. However, because of geometrical tolerances and assembly errors, the compensation doesn’t occur and the measured strain is a resultant of bending loads and axial loads which are undesired to measure the torque associated with the system. An analytical formulation has been developed using Matlab and this thesis gives the generalized indication of the strain due to all the associated loads. The user shall also entire the region where the strain needs to be computed and this knowledge can be useful for placing the strain gauges in the shaft accordingly. Initially, the formulation is based on a standard Torque Transducer used at Atlas Copco and then, a generalized result has been developed. The theoretical formulation is verified using the ProEngineer Mechanica software. The end user shall enter the different loads (if any) along with the geometrical tolerance values and the output will be an indication of the strain at point, strain at a region and sensitivity. The main intention of the thesis is to create a better understanding of the strain associated with the twisting, bending and axial loads and also the geometrical imperfections. The user can also make a decision on the location of strain gauges on a shaft for maximum accuracy. Finally, the differences in error from different possible configurations are compared and a conclusion has been made based on factorial design pertaining to design of experiments.
Momentgivare är små sensorer som används för att mäta och registrera vridmomentet på en roterande axel. Momentgivare baseras vanligtvis på trådtöjningsmätare för att mäta vridmomentetet kring axeln de är fixerade på. Det skall noteras att en ideal momentgivare endast bör mäta den yttöjning som uppkommer på grund av ett vridmoment. Den belastning som uppkommer på grund av axelns böjning kompenseras bort med hjälp av en Wheatstonebrygga. Men på grund av geometriska toleranser och monteringsfel kan kompensationen bli felaktig och då påverkas det uppmätta momentet även av böj och axialbelastningar vilket är oönskat. En analytisk modell har utvecklats med hjälp av Matlab och denna rapport undersöker de olika lastfallens bidrag till momentfelet. Användaren kan ange området där yttöjningen skall beräknas och utifrån de beräkningarna bestämma var trådtöjningsgivarna bör placeras. Inledningsvis är beräkningarna baserade på en av Atlas Copcos momentgivare och sedan har generaliserade resultat utvecklats. De teoretiska beräkningarna verifieras med hjälp av programmet ProEngineer Mechanica. Användaren kan ange vilka belastningar som axeln känner samt de geometriska toleransvärdena och modellen beräknar då ytspänningen för den valda regionen. Det huvudsakliga syftet med denna avhandling är att skapa en bättre förståelse av ytspänningen som uppkommer på grund av vridning, böjning och axiella belastningar och även geometriska imperfektioner. Modellen kan också användas för att göra beräkningar som visar var töjningsgivare bör placeras på axeln för maximal precision. Slutligen har de introducerade felet från de olika möjliga konfigurationerna jämförts och en slutsats har dragits baserat på faktorförsök.
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Abeysekera, Jeffrey Michael. "Dual-transducer ultrasound for elastography." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/27812.

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Medical imaging techniques provide valuable information about the internal anatomy of the body. Commonly used techniques can render many properties of the anatomy and its function, but they are limited in their ability to measure tissue mechanical properties such as elasticity. Over the past two decades there has been growing interest in developing methods of noninvasively characterizing mechanical properties of tissues; a field commonly referred to as elastography. Tissues are known to exhibit changes in mechanical properties in response to pathology. As a result, elastography has the particular potential to help physicians diagnose and locate cancerous tumors and other malignancies. The principle of operation of elastography systems is to apply an excitation to the tissue, such as a compression, and to measure the resulting tissue motion as it deforms. The tissue elasticity can then be inferred from the motion estimates by solving the inverse problem. Tissue motion is typically measured with ultrasound because it is fast, safe, and relatively inexpensive. The point spread function of an ultrasound beam is anisotropic, resulting in poorer quality motion estimates in two of the three spatial directions. This thesis investigates a new method of estimating tissue motion by employing two ultrasound transducers with different view angles. The goal of using these two transducers is to create a plane of high quality 2D motion estimates. Simulations and experimental results on tissue mimicking phantoms show that the method outperforms other commonly used 2D motion estimation methods. For example, in a tissue deformation simulation, the dual transducer method produced lower root mean square measurement error by a factor of 10 compared to a single transducer technique, and a factor of 3 compared to a single transducer with angular compounding. A simple wire-based method of aligning the transducers into a coincident scan plane is initially developed. Later, a novel wedge-based phantom is designed for aligning the two transducers. Calibration results demonstrate improved alignment with the wedge phantom. Manual alignment is found to be repeatable with mean alignment errors under 1 degree in rotation and 1 mm in translation for all degrees of freedom after six independent trials.
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Sineiro, Guilherme da Silva. "Underwater multimode directional transducer evaluation." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Dec%5FSineiro.pdf.

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Thesis (M.S. in Engineering Acoustics)--Naval Postgraduate School, December 2003.
Thesis advisor(s): Thomas J. Hofler, Joseph A. Rice. Includes bibliographical references (p. 53-54). Also available online.
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Santos, Djalma Simões dos. "Shear wave elastography with two-dimensional ultrasound transducer." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3154/tde-01102018-142217/.

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Chronic liver diseases are the eighth leading cause of death in Brazil and a major public health problem in the world. Liver biopsy is the best available reference standard for evaluating and classifying stages of liver diseases, but it presents limitations and complications that are common in invasive methods. In recent years, elasticity imaging methods have been the focus of intense research activity with the ability to measure mechanical properties of soft tissues in a non-invasive way. Shear wave elastography is one of the most promising methods because it enables to quantitatively assess tissue elasticity. However, the current depth range of shear wave elastography impedes its application in obese patients, which have a great risk of developing liver disease. The aim of this study is to investigate the use of shear wave elastography in deeper tissues using a two-dimensional ultrasound transducer array. An efficient transducer array arrangement was simulated, fabricated and characterized. The results show that the proposed transducer configuration presents enhanced transmitting capabilities for generating tissue displacement in deeper tissues. In addition, numerical simulations were performed in order to track the tissue deformation and reconstruct its elastic properties.
Doenças crônicas do fígado são a oitava causa de morte no Brasil e um dos principais problemas de saúde pública do mundo. A biópsia do fígado é o melhor padrão de referência disponível para avaliação e classificação dos estágios das doenças hepáticas, mas apresenta limitações e complicações que são comuns nos métodos invasivos. Nos últimos anos, métodos de imagem por elasticidade têm sido o foco de intensa atividade de pesquisa, pois têm a capacidade de medir propriedades mecânicas dos tecidos moles de maneira não invasiva. A elastografia por ondas de cisalhamento é um dos métodos mais promissores, pois permite avaliar quantitativamente a elasticidade do tecido. No entanto, a atual faixa de profundidade da elastografia por ondas de cisalhamento impede sua aplicação em pacientes obesos, que apresentam grande risco de desenvolver doença hepática. O objetivo deste estudo é investigar o uso da elastografia por onda de cisalhamento em tecidos mais profundos usando um transdutor de ultrassom bidimensional. Uma configuração eficiente de transdutores matriciais foi simulada, fabricada e caracterizada. Os resultados mostram que o transdutor proposto possui capacidade de transmissão melhorada para gerar deslocamento em tecidos profundos. Além disso, simulações numéricas foram realizadas para monitorar a deformação do tecido e reconstruir suas propriedades elásticas.
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Books on the topic "Transducer"

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1939-, Page David, ed. Transducer handbook: User's directory of electrical transducers. Oxford: Newnes, 1992.

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Transducer. Tucson, AZ: Chax Press, 2008.

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The transducer project book. Blue Ridge Summit, PA: TAB Books, 1985.

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Claus, Richard O. Acoustooptic pulse-echo transducer system. [Washington, D.C.?: National Aeronautics and Space Administration?, 1985.

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Kozielski, Lucjan. Piezoelectric transformer in transducer applications. Katowice: University of Silesia, 2012.

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Jarng, Soon Suck. Sonar transducer analysis and optimization. Birmingham: University of Birmingham, 1991.

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Sawla, A. Intercomparison of force transducer calibration. Luxembourg: Commission of the European Communities, 1987.

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Hahnel, H. Capacitance transducer for process tomography. Manchester: UMIST, 1995.

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Norton, Harry N. Sensor and transducer selection guide. Oxford, UK: Elsevier Advanced Technology, 1990.

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C, Wade Janet, and United States. National Aeronautics and Space Administration., eds. Acoustooptic pulse-echo transducer system. [Washington, D.C.?: National Aeronautics and Space Administration?, 1985.

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Book chapters on the topic "Transducer"

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Bose, Sougata, S. N. Krishna, Anca Muscholl, and Gabriele Puppis. "One-way Resynchronizability of Word Transducers." In Lecture Notes in Computer Science, 124–43. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-71995-1_7.

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AbstractThe origin semantics for transducers was proposed in 2014, and it led to various characterizations and decidability results that are in contrast with the classical semantics. In this paper we add a further decidability result for characterizing transducers that are close to one-way transducers in the origin semantics. We show that it is decidable whether a non-deterministic two-way word transducer can be resynchronized by a bounded, regular resynchronizer into an origin-equivalent one-way transducer. The result is in contrast with the usual semantics, where it is undecidable to know if a non-deterministic two-way transducer is equivalent to some one-way transducer.
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Gidron, Yori. "Transducer." In Encyclopedia of Behavioral Medicine, 2258–59. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-39903-0_1528.

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Heller, Lois Jane, Celette Sugg Skinner, A. Janet Tomiyama, Elissa S. Epel, Peter A. Hall, Julia Allan, Lara LaCaille, et al. "Transducer." In Encyclopedia of Behavioral Medicine, 1991–92. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4419-1005-9_1528.

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Gooch, Jan W. "Transducer." In Encyclopedic Dictionary of Polymers, 758. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12010.

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Weik, Martin H. "transducer." In Computer Science and Communications Dictionary, 1808. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_19875.

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Gidron, Yori. "Transducer." In Encyclopedia of Behavioral Medicine, 1–2. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4614-6439-6_1528-2.

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Douéneau-Tabot, Gaëtan. "Pebble minimization: the last theorems." In Lecture Notes in Computer Science, 436–55. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-30829-1_21.

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AbstractPebble transducers are nested two-way transducers which can drop marks (named “pebbles”) on their input word. Such machines can compute functions whose output size is polynomial in the size of their input. They can be seen as simple recursive programs whose recursion height is bounded. A natural problem is, given a pebble transducer, to compute an equivalent pebble transducer with minimal recursion height. This problem has been open since the introduction of the model.In this paper, we study two restrictions of pebble transducers, that cannot see the marks (“blind pebble transducers” introduced by Nguyên et al.), or that can only see the last mark dropped (“last pebble transducers” introduced by Engelfriet et al.). For both models, we provide an effective algorithm for minimizing the recursion height. The key property used in both cases is that a function whose output size is linear (resp. quadratic, cubic, etc.) can always be computed by a machine whose recursion height is 1 (resp. 2, 3, etc.). We finally show that this key property fails as soon as we consider machines that can see more than one mark.
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Exibard, Léo, Emmanuel Filiot, and Pierre-Alain Reynier. "On Computability of Data Word Functions Defined by Transducers." In Lecture Notes in Computer Science, 217–36. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45231-5_12.

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AbstractIn this paper, we investigate the problem of synthesizing computable functions of infinite words over an infinite alphabet (data $$\omega $$ ω -words). The notion of computability is defined through Turing machines with infinite inputs which can produce the corresponding infinite outputs in the limit. We use non-deterministic transducers equipped with registers, an extension of register automata with outputs, to specify functions. Such transducers may not define functions but more generally relations of data $$\omega $$ ω -words, and we show that it is PSpace-complete to test whether a given transducer defines a function. Then, given a function defined by some register transducer, we show that it is decidable (and again, PSpace-c) whether such function is computable. As for the known finite alphabet case, we show that computability and continuity coincide for functions defined by register transducers, and show how to decide continuity. We also define a subclass for which those problems are PTime.
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Kuttner, Thomas, and Armin Rohnen. "Velocity Transducer (Vibration Velocity Transducer)." In Practice of Vibration Measurement, 101–9. Wiesbaden: Springer Fachmedien Wiesbaden, 2023. http://dx.doi.org/10.1007/978-3-658-38463-0_7.

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Borcosi, Ilie, Nicolae Antonie, and Alina Dinca. "Rotary Transducer." In Technological Developments in Networking, Education and Automation, 373–76. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9151-2_65.

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Conference papers on the topic "Transducer"

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Zennaro, Marco, Alex Haig, Dan J. O’Boy, and Stephen J. Walsh. "An Investigation of Ultrasonic Transducer Loading on a Workpiece." In ASME 2018 Noise Control and Acoustics Division Session presented at INTERNOISE 2018. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/ncad2018-6125.

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Arrays of dry-coupled thickness-shear transducers are often employed in the guided wave sector to inspect pipelines and plate-like structure. The dry coupling permits to dismiss any coupling material between the transducer and the waveguide, but as a drawback a preload must be applied on the transducers to guarantee an effective coupling between the two surfaces. Although the influence of the preload on the natural frequencies is studied in the literature, the frequency response function of a transducer relating the input voltage to the displacement output is not present in the literature. Moreover, the distribution of force on the backing mass and the effect of the preload on the uniformity of vibration of the transducers are still missing. A natural frequency analysis and a forced analysis are then computed numerically with finite element analysis to quantify the influence of the preload on a thickness-shear transducer. Furthermore, these results are compared with experimental results obtained with a Laser Vibrometer. It is then shown how the geometrical layout of the transducer coupled with the preload influences the vibration of the transducer.
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Askov, J. B., M. O. Jensen, J. L. Hoenge, H. Nygaard, J. M. Hasenkam, and S. L. Nielsen. "Miniature Transducer for Chordal Force Measurements In Vivo." In ASME 2010 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2010. http://dx.doi.org/10.1115/sbc2010-19181.

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The objective of this study was to develop a miniature force transducer capable of measuring tension in chordae tendineae (CT). The force transducer should be small in size compared with former CT force transducers [1;2] while not compromising implantation, durability and sensitivity.
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Lai, Amit, and Richard M. White. "Optimization of the Silicon/PZT Longitudinal Mode Resonant Transducer." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0940.

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Abstract An analytical electromechanical model of a silicon/PZT laminate longitudinal mode resonant transducer is presented. The validity of this model is shown by the excellent agreement between the predicted and measured impedance of transducers with different device parameters. The experimental data also show a maximum value of 34 for the product of the quality factor and the effective electromechanical coupling. This figure of merit product, an indication of the power output capacity of a transducer, is two to three times higher than that of metal-based transducers. Additionally, silicon can sustain eight times higher ultrasonic velocities than high-strength titanium alloys, indicating that silicon-based ultrasonic transducers can produce much higher intensities efficiently.
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Chen, Steven, and J. Albert Chiou. "Hall Sensors Using Piezoresistive Transducer Fabrication Process." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13592.

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A piezoresistive transducer (PRT) pressure sensor would be able to sense a magnetic field and provide an adequate Hall effect output. In this study, two different types of boron-doped transducers, X-ducer and picture-frame transducer (also called micro Wheatstone-bridge transducer) were tested for the Hall effect. It is found that the currently used fabrication process and packaging for PRT pressure sensors do not need to be altered for Hall sensors. However, a slight mask modification is necessary to use an X-ducer instead of a picture-frame transducer for the Hall effect sensing because the X-ducer is at least 50 times more sensitive than the picture-frame transducer. The sensitivity calculated using the Hall theory and estimated hole mobility velocity is in reasonably good agreement with experimental results.
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Dartois, Luc, Paul Gastin, Govind, and Krishna. "Efficient Construction of Reversible Transducers from Regular Transducer Expressions." In LICS '22: 37th Annual ACM/IEEE Symposium on Logic in Computer Science. New York, NY, USA: ACM, 2022. http://dx.doi.org/10.1145/3531130.3533364.

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Benthien, George W. "Use of Geometric Symmetry in Transducer Array Interaction Problems." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0222.

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Abstract To predict the performance of transducers operating in an array it is necessary to consider the acoustic interaction between transducers. This analysis usually involves solving a system of equations involving certain transducer impedances as well as mutual radiation impedances between transducer elements. This problem can be simplified by taking into account any geometric symmetries that might be involved. Unlike finite element problems where geometric symmetry can be enforced through boundary conditions, it is necessary in these problems to consider the structure of the radiation impedance matrix induced by the geometric symmetries. In this paper I will show how computation time can be reduced considerably by taking advantage of the special symmetry structure of these matrices.
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Hoffstadt, Thorben, Philip Meier, and Jürgen Maas. "Modeling Approach for the Electrodynamics of Multilayer DE Stack-Transducers." In ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/smasis2016-9327.

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In most cases the electrical behavior of dielectric elastomer (DE) transducers is modeled by an equivalent circuit with lumped electrical parameters. Here, the capacitance is obtained under consideration of the active area of the whole DE transducer, while additional parallel and series resistances model the losses in the dielectric and the electrode respectively. Since this represents a quite simple modeling approach it is very common. However, in general a DE transducer has a certain spatial distribution depending on the design of the considered transducer. Thus, a model with lumped parameters might be inaccurate and does not take into account the field-distribution within the DE transducer. Since no analytical expression of the field-distribution can be derived by solving the partial differential equations for diagonal-edge contacts, within this contribution an electrical network model for a multilayer DE stack-transducer is presented. This model takes into account the influence of the contacting of each single transducer film as well as the electrical interaction of these films and their spatial distribution. Based on this model the influence of different design parameters can be investigated, resulting in design rules for the considered transducers with both optimized transient and static behavior.
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Liou, Jim C. P., and Guohua Li. "Transient Pressure Measurements by Recess-Mounted Transducers." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45252.

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Recess-mounted diaphragm-type pressure transducers are often used in measuring transient pressures. When the rise time of the source pressure is very fast, ringing of the transducer may occur. This study investigates the ringing of such a transducer numerically and experimentally for the purpose of developing a general method to recover transient source pressures. The approach is based on modeling the transient hydraulics of the measurement system. Favorable comparisons between the recovered pressure traces with those measured by a flush-mounted transducer were obtained. The proposed method makes recess-mounted transducers viable for measuring rapidly changing pressures in both liquid and gaseous media.
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Salas, Ken I., and Carlos E. S. Cesnik. "Design of Variable-Length Piezocomposite Transducer for Structural Health Monitoring." In ASME 2008 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2008. http://dx.doi.org/10.1115/smasis2008-385.

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A modally-selective, variable-length anisotropic piezocomposite transducer is designed for guided wave (GW) structural health monitoring applications. The transducer dimensions needed to maximize individual modes are selected based on 3-D elasticity models for GW excitation by finite dimensional transducers. This theory is used to determine these transducer dimensions as a function of the wave phase velocity, and normalized by the substrate thickness. The design and fabrication of the transducer are subsequently described, and a set of experimental tests is conducted in pristine isotropic structures to characterize the actuation and sensing performance of the device. It is shown that the transducer dimensions can be tailored to obtain specific symmetric to antisymmetric mode transmission ratios.
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Pitkänen, J. "Opposite Phased Transducer — Novel Type of Transducer." In QUANTITATIVE NONDESTRUCTIVE EVALUATION. AIP, 2004. http://dx.doi.org/10.1063/1.1711692.

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Reports on the topic "Transducer"

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Cross, L. E. ONR Transducer Materials and Transducers Workshop. Fort Belvoir, VA: Defense Technical Information Center, April 1995. http://dx.doi.org/10.21236/ada329615.

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Kuchnir, M., and J. P. Ozelis. Superconducting current transducer. Office of Scientific and Technical Information (OSTI), October 1990. http://dx.doi.org/10.2172/6326320.

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Dixon, R., T. Darling, and A. Migliori. Ultrasensitive ultrasonic transducer studies. Office of Scientific and Technical Information (OSTI), September 1996. http://dx.doi.org/10.2172/383555.

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Grosshandler, William L. Heat flux transducer calibration:. Gaithersburg, MD: National Institute of Standards and Technology, 1999. http://dx.doi.org/10.6028/nist.ir.6424.

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Watts, David B., and Michael T. Van Tassel. Transducer Development for Explosive Measurements. Fort Belvoir, VA: Defense Technical Information Center, May 1989. http://dx.doi.org/10.21236/ada208615.

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Shrout, Thomas R., and Sei-Joo Jang. Relaxor Ferroelectrics for Electrostrictive Transducer. Fort Belvoir, VA: Defense Technical Information Center, January 1992. http://dx.doi.org/10.21236/ada248671.

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Robinson, H. C., R. T. Richards, J. B. Blottman, and III. Flextensional Transducer Modeling Using Variational Principles. Fort Belvoir, VA: Defense Technical Information Center, September 1993. http://dx.doi.org/10.21236/ada284740.

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Lee, Kang B., and Richard D. Schneeman. A standardized approach for transducer interfacing:. Gaithersburg, MD: National Institute of Standards and Technology, 1996. http://dx.doi.org/10.6028/nist.ir.5911.

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Els, P. S. Wheel Force Transducer Research and Development. Fort Belvoir, VA: Defense Technical Information Center, March 2012. http://dx.doi.org/10.21236/ada557517.

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Tims, A. C., T. A. Henriquez, and J. G. Williams. A Transducer for Bottom-Scattering Measurements. Fort Belvoir, VA: Defense Technical Information Center, December 1985. http://dx.doi.org/10.21236/ada163987.

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