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IEEE 1988 Ultrasonics Symposium Proceedings.最新文献

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Feasibility and diagnostic value of catheter-based ultrasonic systems for intravascular imaging: in vitro comparisons with MRI 导管超声系统用于血管内成像的可行性和诊断价值:与MRI的体外比较
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49489
C. Meyer, E. H. Chiang, D. Fitting, D. M. Williams, A. Buda
{"title":"Feasibility and diagnostic value of catheter-based ultrasonic systems for intravascular imaging: in vitro comparisons with MRI","authors":"C. Meyer, E. H. Chiang, D. Fitting, D. M. Williams, A. Buda","doi":"10.1109/ULTSYM.1988.49489","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49489","url":null,"abstract":"In order to assess the potential image quality of catheter-based ultrasonic imaging and its implications for diagnostic as well as therapeutic use, the authors imaged, in vitro, human renal, iliac, and femoral arteries obtained from autopsy. Ultrasonic imaging was performed using 20- and 30-MHz focused disk transducers of 2-mm and 1-mm-diameter active apertures, respectively. Correlative images from a 2-T, high-resolution magnetic resonance imager (MRI), as well as specimen photomicrographs were also taken. Preliminary results suggest that images of diagnostic quality can be routinely obtained, and catheter-based ultrasonic imaging can serve as an effective adjunct to vascular angioplasty and surgery.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132672357","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
A 32 tap digitally controlled programmable transversal filter 一个32分路数字控制可编程横向滤波器
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49359
C.M. Panasik, W.R. Paxman, J. Culver
{"title":"A 32 tap digitally controlled programmable transversal filter","authors":"C.M. Panasik, W.R. Paxman, J. Culver","doi":"10.1109/ULTSYM.1988.49359","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49359","url":null,"abstract":"A digitally controlled programmable transversal filter (DCPTF) has been developed that uses a 32-tap LiNbO/sub 3/ delay line and two LSI GaAs ICs to digitally control tap weight magnitude and sign. Compared to previously reported PTR devices, this third-generation device is significantly reduced in size and power, yet retains state-of-the-art performance. The device is completely programmable, constrained only by the bandwidth (100 MHz centered at 100 MHz) and the number of taps. The DCPTF is designed in 16-tap blocks to easily expand the number of taps. A calibration method is presented which removes nonideal GaAs FET (field-effect transistor) array gain states due to process variations. The on/off ratio of each individual tap is greater than 35 dB. The DCPTF is demonstrated as a bandpass filter with programmable center frequency and bandwidth.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114916657","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: 9
A new approach to broadband SAW diffraction theory 宽带SAW衍射理论的新方法
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49340
J. Hines, B. Abbott, M. A. West, D. Malocha
{"title":"A new approach to broadband SAW diffraction theory","authors":"J. Hines, B. Abbott, M. A. West, D. Malocha","doi":"10.1109/ULTSYM.1988.49340","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49340","url":null,"abstract":"The authors describe an innovative technique for determining a two-dimensional impulse response diffraction model for a SAW (surface acoustic wave) device from the wave equation using an impulse driver. The approach presented is unique in that it determines the point-to-point impulse response for the isotropic case using the basic wave equation of motion, and utilizes a double integral reduction technique to determine the tap-to-tap response. This takes into account diffraction effects, and provides an impulse response which is valid for the broadband case. Results of the analysis are presented for both the isotropic and anisotropic case.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116681144","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: 6
Detection of non-congruent lithium niobate crystals using the non-destructive derivative spectrophotometry 非一致铌酸锂晶体的无损导数分光光度法检测
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49353
E. Born, E. Willibald-Riha, K. Hofmann, B. C. Grabmaier, G. Talsky
{"title":"Detection of non-congruent lithium niobate crystals using the non-destructive derivative spectrophotometry","authors":"E. Born, E. Willibald-Riha, K. Hofmann, B. C. Grabmaier, G. Talsky","doi":"10.1109/ULTSYM.1988.49353","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49353","url":null,"abstract":"A method called derivative spectrophotometry of higher-order (DSHO) is proposed for quality control to detect stoichiometry variations in lithium niobate crystals. The measured parameter is the wavelength of the absorption edge, which is strongly affected by the composition of the substrate in terms of the Li/sub 2/O mole fraction. Thus this measurement can be performed with high accuracy of within +or-0.05% and is not influenced by the crystal cut, thickness, and surface finish. It is concluded that this method enables crystal producers and customers of wafers to maintain a high-quality standard of the SAW material with respect to relevant physical properties.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131012110","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
Ultrasonic Doppler device for measurement of time-dependent and space-dependent flow speed 用于测量随时间和随空间的流速的超声多普勒装置
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49506
C. Cachard, G. Giménez, D. Vray
{"title":"Ultrasonic Doppler device for measurement of time-dependent and space-dependent flow speed","authors":"C. Cachard, G. Giménez, D. Vray","doi":"10.1109/ULTSYM.1988.49506","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49506","url":null,"abstract":"An effort is made to determine, at each instant, the direction and the magnitude of the velocity of a flow-carried target, provided this target moves within the field monitored by the measuring device. Four transducers (one transmitter and three receivers) are used because the Doppler phenomenon is three-dimensional in the present case. The interaction between the incident ultrasonic wave and the scattering target is modeled by means of a complex envelope. Targets in the form of bubbles injected in the flow are tracked experimentally for a duration of 1 s as they move along a three-dimensional trajectory. This trajectory is reconstructed from velocity results. The proposed 3-D ultrasonic Doppler velocimeter measures the velocity vector and allows reconstruction of the trajectory for targets of 10- mu m minimum size, included in a measurement field of some cubic centimeters, with maximum velocity of some meters per second.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131013000","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: 4
Heterojunction acoustic charge transport device technology 异质结声波电荷传输器件技术
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49357
D. Cullen, W. Tanski, S. W. Merritt, R. Sacks, R. D. Carroll, E. J. Branciforte
{"title":"Heterojunction acoustic charge transport device technology","authors":"D. Cullen, W. Tanski, S. W. Merritt, R. Sacks, R. D. Carroll, E. J. Branciforte","doi":"10.1109/ULTSYM.1988.49357","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49357","url":null,"abstract":"A brief description of the general acoustic charge transport (ACT) device and the operation of ACT devices is given. The application of GaAs-AlGaAs heterojunctions to ACT technology and the design of heterojunction ACT (HACT) devices is discussed. The performance characteristics of experimental HACT devices are presented. It is shown that Nyquist rate bandwidths with rolloffs less than 3dB can be obtained at signal output taps, and that transport currents of 100 mu A can be carried by the SAW with less than 4 mW/ lambda acoustic drive power. In addition, heterojunction FETs (field-effect transistors) with gain up to 10 GHz have been fabricated on HACT substrates, illustrating the compatibility of integrated circuitry with the HACT device substrate.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"246 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132349253","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: 8
Accurate prediction of dispersion and attenuation of long metal strip SAW waveguides on anisotropic substrate 各向异性衬底上金属长条形SAW波导色散和衰减的精确预测
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49380
I. Schropp, L. Reindl, H. Grassl, R. Weigel
{"title":"Accurate prediction of dispersion and attenuation of long metal strip SAW waveguides on anisotropic substrate","authors":"I. Schropp, L. Reindl, H. Grassl, R. Weigel","doi":"10.1109/ULTSYM.1988.49380","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49380","url":null,"abstract":"As a design tool for high-precision long broadband SAW (surface acoustic wave) delay lines, a computationally simple model for strip waveguides has been improved by inclusion of parametric fits to measured anisotropy, dispersion, and attenuation of Rayleigh wave propagation both on free and metallized surfaces of LiNbO/sub 3/. A heuristic approach was used to account for the effect of anisotropy in the case of an imaginary transverse propagation constant, and for the observed increased attenuation in waveguides compared to unbounded surfaces. The model does not rely on material properties as computed from fundamental material constants, and uses only one adjustable parameter which is not directly obtained from surface wave measurements. The phase nonlinearly can be predicted with an accuracy up to +or-0.5 degrees / mu s over a relative bandwidth on the order of 50%.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"364 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133301554","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: 16
Generalized Lamb-wave multisensor 广义兰姆波多传感器
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49440
S. Wenzel, B. A. Martin, Richard M. White
{"title":"Generalized Lamb-wave multisensor","authors":"S. Wenzel, B. A. Martin, Richard M. White","doi":"10.1109/ULTSYM.1988.49440","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49440","url":null,"abstract":"Integrated-circuit fabrication techniques were used to make a versatile silicon-based sensor that uses elastic wave propagation in a plate that is thin compared with the wavelength. In-plane tension raises the velocity of the lowest antisymmetric flexural wave (474 m/s) above that predicted for a pure Lamb wave (422 m/s). Because of the low velocity, when in contact with a fluid the device excites an evanescent disturbance that extends just tens of micrometers from the membrane. The device is quite sensitive to loading: contact with a 6- mu l droplet of water shifts the oscillation frequency downward 36%, in excellent agreement with theory. The device could operate as a microphone, biosensor, chemical vapor or gas detector, scale, manometer, densitometer, viscometer, radiometer, or thermometer. It is concluded that the sensor offers unique means for separating out the influences of multiple measurands.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133942882","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: 18
Composite transducer with multiple piezoelectric matching layers 具有多个压电匹配层的复合换能器
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49429
Q.C. Xu, C. Madhavan, T. T. Srinivasan, S. Yoshikawa, R. Newnham
{"title":"Composite transducer with multiple piezoelectric matching layers","authors":"Q.C. Xu, C. Madhavan, T. T. Srinivasan, S. Yoshikawa, R. Newnham","doi":"10.1109/ULTSYM.1988.49429","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49429","url":null,"abstract":"Trilaminate transducers have been constructed from fired 0-3 piezoelectric materials and nonvoided thick piezoelectric polymer as two matching layers on ceramic PbTiO/sub 3/. Based on the physical properties of the constituent materials, the equivalent circuit of this composite transducer has been established. The frequency response of transmitting, receiving, and voltage transition gain (VTG) for different layers and their hybrid connection was computed and compared with the experimental results. The frequency response of the composite transducer is considerably improved by changing the connecting modes between the layers. Different layers are shown to make different contributions to the frequency dependence of the sensitivity. The transducer impedence and sensitivity response can be adjusted depending on the application.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"14 15","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113984764","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: 15
Interactive PC software for SAW propagation in anisotropic multilayers 各向异性多层声表面波传播的交互式PC软件
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49350
E. Adler, G. Farnell, J. K. Slaboszewicz, C. Jen
{"title":"Interactive PC software for SAW propagation in anisotropic multilayers","authors":"E. Adler, G. Farnell, J. K. Slaboszewicz, C. Jen","doi":"10.1109/ULTSYM.1988.49350","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49350","url":null,"abstract":"A software package which provides an interactive, graphical, and computational environment for surface-acoustic wave (SAW) and plate-mode propagation studies in arbitrarily oriented anisotropic and piezoelectric multilayers is described. The software, which runs on an IBM PC with maths coprocessor, is based on a transfer-matrix formulation for calculating the characteristics of SAW propagation in multilayers, originally written for a mainframe computer. The menu-driven software will calculate wave velocities and field variable variations with depth for any desired propagation direction; the graphics capability provides a simultaneous display of slowness or velocity and of SAW Delta v/v coupling constant curves and their corresponding field profiles in either polar or Cartesian coordinates for propagation in a selected plant or as a function of one of the Euler angles. The program generates a numerical data file containing the calculated velocities and field profile data. Examples illustrating the usefulness of the software in studying various SAW structures are presented.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124111134","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: 13
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