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Proceedings. IEEE Ultrasonics Symposium最新文献

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Matrix methods applied to acoustic waves in multilayers 矩阵法在多层声波中的应用
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67011
E. Adler
{"title":"Matrix methods applied to acoustic waves in multilayers","authors":"E. Adler","doi":"10.1109/ULTSYM.1989.67011","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67011","url":null,"abstract":"Matrix methods for analyzing the electroacoustic characteristics of anisotropic piezoelectric multilayers are described. The conceptual usefulness of the methods is demonstrated by examples that show the simplification of formal statements of propagation, transduction, and boundary-value problems in complicated acoustic layered geometries such as those in SAW (surface acoustic wave) devices, in multicomponent laminates, and in bulk-wave composite transducers. The formulation reduces the electroacoustic equations to a set of first-order matrix differential equations, one for each layer, in the variables which must be continuous across interfaces. The solution to these equations is a transfer matrix that maps the variables from one layer face to the other. Interface boundary conditions for a planar multilayer are automatically satisfied by multiplying the individual transfer matrices in the appropriate order, thus reducing the problem to the imposition of boundary conditions appropriate to the remaining two surfaces. The computational advantages of the matrix method lie in the fact that the problem rank is independent of the number of layers, and in the availability of PC software, which makes interactive numerical experimentation with complex layered structures practical.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"140 1","pages":"367-372 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80037631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 70
Acousto-optic digital computer fundamentals 声光数字计算机基础
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67031
P. Guilfoyle
{"title":"Acousto-optic digital computer fundamentals","authors":"P. Guilfoyle","doi":"10.1109/ULTSYM.1989.67031","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67031","url":null,"abstract":"The author describes how programmable, arbitrary-bit-length, all-digital central processing unit (CPU) computations are now possible by using control logic to compute ALU (arithmetic and logic unit) primitives for emulating a general-purpose programmable computer. These primitives are then executed sequentially in order to calculate 32-b or larger primitives. The author initially discusses the theoretical background which addresses Shannon's expansion theorem (1938), Morozov's control operator method (1984), and DeMorgan's laws. These three schemes are then coupled and mapped onto current optical computer hardware technology using laser diode arrays, multichannel acoustooptic spatial light modulators, and avalanche photodiode arrays.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"27 1","pages":"481-486 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79204226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Acoustical imaging: from ancient Phoenicians to modern physicians 声学成像:从古代腓尼基人到现代内科医生
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67102
G. Wade
{"title":"Acoustical imaging: from ancient Phoenicians to modern physicians","authors":"G. Wade","doi":"10.1109/ULTSYM.1989.67102","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67102","url":null,"abstract":"Ultrasonic energy can produce images not obtainable with any other form of radiation. The human use of sound in imagery is centuries old, and many instruments of great utility have been developed. Pulse-echo, phase-amplitude, and amplitude-mapping approaches constitute the conceptual bases for three fundamental types of acoustic imaging systems. By now, however, systems exist that combine these approaches in ways that make their unambiguous categorization difficult or impossible. These systems frequently employ principles associated with holography, tomography, microscopy, and seismic exploration.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"150 1","pages":"821-826 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77382666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Photoacoustic design problems in low pressure and cryo temperature operation 低压和低温运行中的光声设计问题
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67045
K. Yang, J. Burt, J. J. Caldwell, P. Delaney, R. Halthore, J. E. Allen
{"title":"Photoacoustic design problems in low pressure and cryo temperature operation","authors":"K. Yang, J. Burt, J. J. Caldwell, P. Delaney, R. Halthore, J. E. Allen","doi":"10.1109/ULTSYM.1989.67045","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67045","url":null,"abstract":"Microphone operation at low pressure and temperature is necessary in order to derive needed vibrational relaxation data for methane. Measurements were made using a specially designed photoacoustic cell. The successful low-pressure operation of the cell is borne out by theoretical computations. It is demonstrated that low-pressure vibrational lifetimes can be measured successfully in methane down to the cryo temperatures of interest to planetary atmospheric modelers. The photoacoustic technique appears capable of producing vibrational relaxation data over wide pressure range, wider than that often reported by fluorescence measurements.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"42 1","pages":"551-553 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77624048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On realistic modeling of laser-generated ultrasound pulses 激光产生的超声脉冲的真实建模
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67041
F. A. McDonald
{"title":"On realistic modeling of laser-generated ultrasound pulses","authors":"F. A. McDonald","doi":"10.1109/ULTSYM.1989.67041","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67041","url":null,"abstract":"A novel formulation of pulsed photoacoustic generation which should facilitate the study of applications of laser-generated acoustic pulses is described and illustrated. This formulation has advantages both in the analytical results obtained and in the ease of numerical calculations. Numerical calculations are presented to illustrate the efficacy of this approach, with emphasis on the effects of finite-source dimensions and on the initial waveform. The origin of the precursor signal is addressed using this formulation. It is concluded that the precursor is due to thermal-to-acoustic mode conversion at the sample surface. In addition, calculations of surface wave progenitors exhibit the advantages of the method in treating near-field propagation.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"27 1","pages":"531-534 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87083408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Self focusing in inhomogeneous media with time reversal acoustic mirrors 时间反转声镜在非均匀介质中的自聚焦
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67072
M. Fink, C. Prada, F. Wu, D. Cassereau
{"title":"Self focusing in inhomogeneous media with time reversal acoustic mirrors","authors":"M. Fink, C. Prada, F. Wu, D. Cassereau","doi":"10.1109/ULTSYM.1989.67072","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67072","url":null,"abstract":"Focusing on a reflective target in an inhomogenous medium is difficult. In order to obtain good focusing properties, the concept of optical phase-conjugate mirrors, valid for monochromatic signals, is extended to large-bandwidth pulses such as those used in ultrasound echography. The transducer's linear response to the acoustic pressure allows replacement of the phase conjugation by a time-reversal operation on the pulse echo signals. The time-reversal mirror is an array of transmit-receive transducers. A first incident wave is reflected by the target. The received signals are stored in shift registers, reversed in times and then reemitted. The major advantage of this process is that the waves distorted by the aberrating medium are corrected by the mirror operation and the back propagation through the medium. When the medium contains several reflectors, this time-reversal process can be iterated in order to focus on the most-reflective one.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"2015 1","pages":"681-686 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87092806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 323
GHz low-loss filters on LiTaO/sub 3/ operating at higher harmonics LiTaO/sub - 3/上的高次谐波低损耗滤波器
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66990
R. Dill, K. Anemogiannis, H. Grassl
{"title":"GHz low-loss filters on LiTaO/sub 3/ operating at higher harmonics","authors":"R. Dill, K. Anemogiannis, H. Grassl","doi":"10.1109/ULTSYM.1989.66990","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.66990","url":null,"abstract":"The authors developed a miniature low-loss SAW (surface acoustic wave) filter for gigahertz frequencies using the leaky surface wave on 36 degrees rotated YX-LiTaO/sub 3/. The filter operates at spatial harmonics, and therefore is suited for mass production using a standard single-layer lift-off process with 0.8- mu m photolithography and the authors, standard photoresist technique. To achieve low insertion loss the authors used a three-transducer configuration with group-type unidirectional transducers that are electrically matched by a new, simplified phasing and matching network requiring only one circuit element, which is integrated into the package. The filter operates at 1.85 GHz and has an insertion loss of 9.4 dB, a 3-dB-bandwidth of 16 MHz, and 35-dB sidelobe suppression.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"72 1","pages":"251-254 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90427015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design and compensation of nonequidistantly sampled SAW transducers 非等距采样SAW传感器的设计与补偿
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66953
C. Ruppel, C. Kappacher, L. Reindl, G. Visitini
{"title":"Design and compensation of nonequidistantly sampled SAW transducers","authors":"C. Ruppel, C. Kappacher, L. Reindl, G. Visitini","doi":"10.1109/ULTSYM.1989.66953","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.66953","url":null,"abstract":"A noniterative algorithm for the design of nonequidistantly sampled interdigital transducers (IDTs) is presented. This method allows the precise design of IDTs with a given impulse response. Deviations according to the impulse model are less than 0.1 dB within the passband. The authors present the design and the compensation of second-order effects of a delay line with two chirped and apodized IDTs and present measurements of this filter.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"32 1","pages":"19-23 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73579447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Characterization and effects of the weld inductance in mechanical filters with longitudinal coupling 纵向耦合机械滤波器中焊缝电感的表征及影响
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67023
W. Domino
{"title":"Characterization and effects of the weld inductance in mechanical filters with longitudinal coupling","authors":"W. Domino","doi":"10.1109/ULTSYM.1989.67023","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67023","url":null,"abstract":"It is shown by finite-element analysis that a secondary coupling wire phenomenon, namely longitudinal shear, is capable of producing significant distortion in the response of a mechanical filter, without any contribution from other sources (such as resonator spurious modes). The simplest model for the presence of this longitudinal shear is the weld inductance, placed in series with the resonator model in the electrical equivalent circuit. The weld inductance can be determined by the comparison of the responses of three-pole mechanical filters with continuous versus bisected coupling wires. Underneath a bridging wire, the weld inductance causes an error in the bridging coupling that can be compensated for the predistortion.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"25 1","pages":"435-439 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73420694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Medical ultrasonic probe using electrostrictive-ceramics/polymer composite 电致伸缩陶瓷/聚合物复合材料医用超声探头
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67077
H. Takeuchi, H. Masuzawa, C. Nakaya, Y. Ito
{"title":"Medical ultrasonic probe using electrostrictive-ceramics/polymer composite","authors":"H. Takeuchi, H. Masuzawa, C. Nakaya, Y. Ito","doi":"10.1109/ULTSYM.1989.67077","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67077","url":null,"abstract":"A medical ultrasonic probe the sensitivity of which is controlled by a DC bias field is developed using an electrostrictive-ceramics-polymer composite as a transducer material. (1-x)Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-xPbTiO/sub 3/ electrostrictive-ceramics ((1-x)PMN-xPt) are used because they have a large electromechanical coupling factor for the thickness vibrational mode, k/sub t/, under a practical bias field. 0.91PMN-0.09PT/polyurethane 1-3 composites (thickness 0.22 mm, 7.5 MHz) are fabricated using a dicing and filling technique. The 0.91PMN-0.09PT has no residual k/sub t/ after removing the DC bias field around room temperature. Pulse-echo experimentation shows that the echo amplitude increases with the bias field, as expected from the relationship between k/sub t/ and the bias field.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"20 1","pages":"705-708 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74174579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 17
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