1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)最新文献_第6页

3D simulation of controlled micromachined capacitive ultrasound transducers 可控微机械电容式超声换能器的三维仿真

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI: 10.1109/ULTSYM.1999.849202

M. Kaltenbacher, H. Landes, K. Niederer, R. Lerch

引用次数: 13

A study of SAW gas sensing versus gas concentration SAW气体传感与气体浓度的关系研究

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI: 10.1109/ULTSYM.1999.849445

I. V. Anisimkin, V. Anisimkin, C. Caliendo, E. Verona, M. Penza

{"title":"A study of SAW gas sensing versus gas concentration","authors":"I. V. Anisimkin, V. Anisimkin, C. Caliendo, E. Verona, M. Penza","doi":"10.1109/ULTSYM.1999.849445","DOIUrl":"https://doi.org/10.1109/ULTSYM.1999.849445","url":null,"abstract":"An analytical expression for the SAW sensor gas response versus gas concentration (calibration curve) is deduced, at low gas concentrations, on using the perturbation approach. The calibration curve, the sensitivity (its slope) and the detection limit (threshold value) for a given gas and sorbent membrane, can be controlled by a proper choice of the substrate material and its crystallographic orientation. We show how this property takes place from the anisotropy of the SAW propagation on piezoelectric single crystals, allowing to change the partial contributions to the SAW response through mechanical displacements, coupling constant and temperature coefficient of velocity (TCV). The theoretical predictions are experimentally verified on devices implemented on different orientations of quartz and LiNbO3 substrates, using Pd, Pd:Ni and polyvinyl alcohol (PVA) as sorbent films and humid air as analyte. The lowest threshold value of RH (0.01%) and the highest sensitivity (49 ppm/%) are detected in the PVA/yz-LiNbO3 structure, whose sensitivity is about two orders of magnitude higher than that observed in uncoated LiNbO3.","PeriodicalId":339424,"journal":{"name":"1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123390608","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: 7

Single crystal composites, transducers, and arrays 单晶复合材料，换能器和阵列

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI: 10.1109/ULTSYM.1999.849149

M. Zipparo, C. Oakley, W. Hackenberger, L. Hackenberger

引用次数: 14

Contrast mechanism of ultrasonic atomic force microscopy 超声原子力显微镜的对比机理

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI: 10.1109/ULTSYM.1999.849471

W. Gao, B. Tittmann, C. Miyasaka

引用次数: 4

Phase and group velocity in components of Lamb waves in pulses 脉冲中兰姆波分量的相速度和群速度

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI: 10.1109/ULTSYM.1999.849526

E. Moreno, M. Castillo, P. Acevedo

引用次数: 1

Improved time domain diffraction analysis for SAW transducers of arbitrary shape 改进的任意形状SAW换能器时域衍射分析

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI: 10.1109/ULTSYM.1999.849364

M. Jungwirth, T. Greifeneder, K. Scheiblhofer, A. Stogmuller, R. Weigel, D. Malocha, W. Ruile, C. Ruppel

{"title":"Improved time domain diffraction analysis for SAW transducers of arbitrary shape","authors":"M. Jungwirth, T. Greifeneder, K. Scheiblhofer, A. Stogmuller, R. Weigel, D. Malocha, W. Ruile, C. Ruppel","doi":"10.1109/ULTSYM.1999.849364","DOIUrl":"https://doi.org/10.1109/ULTSYM.1999.849364","url":null,"abstract":"A time domain (TD) diffraction analysis for SAW transducers was previously developed based on Huygen's principle. The analysis was performed using an approximation to the scalar two dimensional impulse response of an ideal point source which allowed for fast computation of diffraction effects in the time domain. A more rigorous derivation of the TD impulse response from the frequency domain (FD) angular spectrum of waves (ASoW) approach for the case of isotropic phase velocity has also been previously presented, and the extension of the analysis to include the velocity and electromechanical coupling anisotropy found in typical SAW substrates was also included. In order to be able to use the FFT for fast computation an equidistant sampling in the time domain must be evaluated. The present paper will report on an improved resampling-algorithm with a particular weighting to obtain the required equidistant impulses in the time-response, to be able to use the Fast Fourier Transform. Arbitrary transducer geometries can be dealt with by our TD technique. Numerical simulation results (impulse and frequency responses) for specific geometries will be presented.","PeriodicalId":339424,"journal":{"name":"1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130589517","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

Electrical characteristics of ribbon-based probe cables 带状探测电缆的电气特性

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI: 10.1109/ULTSYM.1999.849188

J. Griffith, R. Lebender

引用次数: 12

Monitoring low-power heat deposition with elastography 用弹性成像技术监测低功耗热沉积

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI: 10.1109/ULTSYM.1999.849260

F. Kallel, K. Khirasaki, A. Alaniz, J. Ophir

引用次数: 6

Optimization of microbubble destruction 微泡破坏的优化

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI: 10.1109/ULTSYM.1999.849322

J. Chomas, P. Dayton, K. Morgan, J. Allen, K. Ferrara

{"title":"Optimization of microbubble destruction","authors":"J. Chomas, P. Dayton, K. Morgan, J. Allen, K. Ferrara","doi":"10.1109/ULTSYM.1999.849322","DOIUrl":"https://doi.org/10.1109/ULTSYM.1999.849322","url":null,"abstract":"The rapid destruction of an ultrasound contrast agent on the time scale of microseconds which occurs when the bubble fragments provides the opportunity to distinguish echoes from bubbles and tissue. Fragmentation occurs when non-spherical oscillations in the bubble become large enough to produce a pinch-off of bubble fragments. The authors find that two factors are important in gauging the probability of fragmentation, the ratio of maximum expansion diameter to minimum compression diameter and the peak wall velocity. For wideband insonation (1-2 cycle insonation), the maximum expansion of a bubble relative to the initial diameter and the occurrence of fragmentation increase with decreasing bubble initial diameter. The ratio of expansion and the occurrence of fragmentation also increase with decreasing center frequency of for all frequencies and initial an increase in transmitted peak negative pressure yields increased expansion ratio and occurrence of fragmentation. A dependence of fragmentation on the phase of insonation is observed. A transmitted pulse of 0/spl deg/ phase (compression precedes rarefaction) produces fragmentation less than the same pulse but of phase 180/spl deg/ (rarefaction precedes compression). The maximum expansion of the bubble is larger in the 0/spl deg/ case but the wall velocity is larger in the 180/spl deg/ case.","PeriodicalId":339424,"journal":{"name":"1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131358747","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: 11

Design of an ultrasonic sensor to emulate bat bio-sonars 一种模拟蝙蝠生物声呐的超声波传感器设计

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI: 10.1109/ULTSYM.1999.849430

A. Fiorillo

引用次数: 4