1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)最新文献_第7页

Proximity sensors utilizing an evanescent acoustic field formed by flexural plate waves 利用由弯曲板波形成的倏逝声场的接近传感器

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.663066

S. Hongo, I. Naliamura, N. Hosokawa

引用次数: 2

Sol-gel fabricated thick piezoelectric ultrasonic transducers for potential applications in industrial material processes 溶胶-凝胶制备的厚压电超声换能器在工业材料加工中的潜在应用

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.661751

L. Zou, M. Sayer, C. Jen

引用次数: 16

SPUDT-based tunable resonant coupling of different acoustic channels 基于spudd的不同声道可调谐谐振耦合

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.662983

B. Sveshnikov, A. Shitvov

引用次数: 2

Evaluation of keratoprosthesis biointegration in situ with quantitative ultrasound backscatter microscopy 定量超声后向散射显微镜评价角膜假体原位生物整合

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.661770

A. Saied, B. Dehecq, M. Savoldelli, B. Briat, J. Legeais, G. Berger

引用次数: 0

Resonant second-harmonic generation accompanying nonlinear Love-wave propagation in an isotropic waveguide 在各向同性波导中伴随非线性love波传播的共振二次谐波产生

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.663088

D. Xi

引用次数: 1

Effects of abdominal wall morphology on ultrasonic pulse distortion 腹壁形态对超声脉冲畸变的影响

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.661859

L. M. Hinkelman, T. Mast, M. J. Orr, R. Waag

{"title":"Effects of abdominal wall morphology on ultrasonic pulse distortion","authors":"L. M. Hinkelman, T. Mast, M. J. Orr, R. Waag","doi":"10.1109/ULTSYM.1997.661859","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.661859","url":null,"abstract":"Wavefront propagation through the abdominal wall was investigated by measurements employing full-thickness specimens and their individual fat and muscle layers. These measurements confirm that both fat and muscle produce significant wavefront distortion and focus degradation. However, the spatial characteristics of the distortion produced by fat and muscle differ, and the total distortion produced by the abdominal wall is not the arithmetic sum of that produced by the individual layers. The interface between the muscle and subcutaneous fat layers, which consists of a thin layer of connective tissue, was found to be smooth or slightly curved. Distortion produced by different tissues was further characterized by simulations using a finite-difference time-domain implementation of the linearized wave propagation equations for a lossless inhomogeneous fluid. Scanned images of six human abdominal wall cross sections provided the data for the propagation media in the simulation. The images were mapped into regions of fat, muscle, and connective tissue, each of which was assigned a uniform sound speed and density obtained from literature values. The computed wavefronts contained arrival time, energy level, and wave shape distortion similar to that in measurements. Visualization of wave propagation within the tissue cross sections suggests that most arrival time distortion is produced by acoustic path length differences while amplitude and waveform variations are the result of scattering from inhomogeneities. Many arrival time fluctuation and energy level fluctuation features could be traced to specific anatomical structures. These results indicate that wavefront distortion, apart from bulk attenuation effects, is primarily caused by tissue structures and inhomogeneities rather than refraction at layer interfaces.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"113 1","pages":"1493-1496 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79864138","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: 28

Thermal generation, diffusion and dissipation in 1-3 piezocomposite sonar transducers: finite element analysis and experimental measurements 1-3个压电复合声纳换能器的热产生、扩散和耗散:有限元分析和实验测量

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.661725

N. Abboud, J. Mould, G. Wojcik, D. Vaughan, D. Powell, V. Murray, C. Maclean

{"title":"Thermal generation, diffusion and dissipation in 1-3 piezocomposite sonar transducers: finite element analysis and experimental measurements","authors":"N. Abboud, J. Mould, G. Wojcik, D. Vaughan, D. Powell, V. Murray, C. Maclean","doi":"10.1109/ULTSYM.1997.661725","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.661725","url":null,"abstract":"Thermal management is an important consideration in ultrasound transducer design. It arises in satisfying regulatory and safety requirements in diagnostic and therapeutic ultrasound, as well as in sustaining performance in high power applications such as underwater sonar. A finite element modeling approach was developed to aid in the analysis of this coupled electro-mechanical-thermal problem. The finite element model tracks the damping losses in the electromechanical portion of the problem and converts the lost energy into a thermal dose which constitutes the \"input\" to the thermal portion of the problem. The resultant temperature spatial and temporal distribution is then solved for. This modeling approach was used to study several 1-3 piezocomposite high power transducers for which experimental data was available. Previous experimental evaluation has demonstrated that these devices can suffer from a degradation in performance due to significant temperature rises at power levels of approximately 2 W/cm/sup 2/ for continuous operation, whereas they can operate efficiently at power levels greater than 20 W/cm/sup 2/ when the duty cycle is reduced below 10%. A detailed thermal analysis of these transducers with respect to efficiency of the thermal dissipation within them is required with a view to understanding and consequently improving the high drive performance of these devices. The goal of this preliminary study is to evaluate the modeling approach and identify key parameters to which the solution is sensitive. Parameters so identified, be they material constants or modeling approaches, will be subject to more complete characterization in follow-up studies aimed at quantitative validation of computational modeling of thermal management in ultrasonic applications.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"89 1","pages":"895-900 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80250719","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: 22

An efficient method of including electrode interactions in the Green's function model for SAW interdigital transducers 一种有效的方法，包括电极的相互作用，在绿色的函数模型，为SAW数字间换能器

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.662994

W. Liu, P.M. Smith

引用次数: 0

Automatic design procedure using circuit composition technique for SAW devices 使用电路组成技术的SAW器件自动设计程序

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.663002

T. Shiba, Y. Fujita, N. Kamogawa, N. Hosaka, S. Ogawa, K. Oda, M. Hikita

引用次数: 4

Pulse inversion Doppler: a new method for detecting nonlinear echoes from microbubble contrast agents 脉冲逆多普勒:一种检测微泡造影剂非线性回波的新方法

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.663301

D. Simpson, P. Burns

引用次数: 207