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IEEE Symposium on Ultrasonics最新文献

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Thickness modes of vibration of contoured SBTC-cut quartz plates 轮廓型sbtc切割石英板的厚度振动模态
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171424
B. Sinha
{"title":"Thickness modes of vibration of contoured SBTC-cut quartz plates","authors":"B. Sinha","doi":"10.1109/ULTSYM.1990.171424","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171424","url":null,"abstract":"High-performance thickness-shear quartz resonators use trapped energy modes of vibration since these modes exhibit reduced mounting losses and possible reflections of anharmonic overtones from the electrode or plate boundaries. Trapped energy modes of vibration are obtained by appropriate contouring or beveling of the plate surfaces. The effect of contouring on energy trapping depends strongly on the crystalline orientation and the selected thickness harmonic mode of vibration. The earlier work of D. S. Stevens and H. F. Tiersten (1986) on the analysis of the SC-cut contoured quartz resonators for the C-mode of vibration is extended to obtain results for any of the three thickness (A-, B-, or C-) modes of vibration of any doubly-rotated cut of quartz.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"1994 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131148470","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
Implementation of ultrasound speckle filters for clinical trial 实现超声散斑滤波器的临床试验
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171636
D. C. Crawford, D. Bell, J. Bamber
{"title":"Implementation of ultrasound speckle filters for clinical trial","authors":"D. C. Crawford, D. Bell, J. Bamber","doi":"10.1109/ULTSYM.1990.171636","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171636","url":null,"abstract":"Two methods are described and evaluated for compensating for the signal processing characteristics of ultrasound scanners in an adaptive speckle filter. Precorrection, in which the B-scan is transformed by the inverse of the scanner transfer function, is effective if the algorithm is calculated in full floating point arithmetic (FFP), but integer implementation results in artifacts. Postcorrection, where the speckle reference is adjusted according to its observed variation with the mean amplitude, is equally effective whether implemented in FFP or 16/8-b integer arithmetic.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130050263","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
Forward scattering from solid or fluid-filled inclusion buried in multilayered elastic structures 埋在多层弹性结构中的固体或流体包裹体的正向散射
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171507
E. Aymé‐Bellegarda, H. Chang, T. Habashy
{"title":"Forward scattering from solid or fluid-filled inclusion buried in multilayered elastic structures","authors":"E. Aymé‐Bellegarda, H. Chang, T. Habashy","doi":"10.1109/ULTSYM.1990.171507","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171507","url":null,"abstract":"The scattering from finite-size inclusions buried in a multilayered, elastic background structure is studied both analytically and numerically, and this information is correlated with the geometrical and elastic properties of the inclusion. The framework developed is based on a vector integral equation formalism for elastic scattering, where a Born approximation for an inhomogeneous background medium is applied to obtain a closed-form expression for the scattered field. Both compressional and shear waves are assumed to propagate inside the layers, and cross-polarization at the boundaries and multiple reflections within the layers are taken into account.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"190 11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130312709","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
Ultrasonic imaging by fractal dimension of power spectrum shape 超声成像分形维数的功率谱形状
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171608
T. Kikuchi, S. Kiryu, S. Sato
{"title":"Ultrasonic imaging by fractal dimension of power spectrum shape","authors":"T. Kikuchi, S. Kiryu, S. Sato","doi":"10.1109/ULTSYM.1990.171608","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171608","url":null,"abstract":"A new method for imaging the random media by analyzing power spectrum shapes using fractal dimensions is presented. It may be possible to estimate the structural characteristics from the spectrum, because the ultrasonic power spectrum shapes may be affected by the statistical distributions of the point scatterers in the random media. Fractal theory is adapted to estimate the power spectrum shapes. The fractal dimension is used for characterization of the complexities of the power spectrum shape because it indicates the complexity or roughness of figures. The relations of mean spacing vs. fractal dimension and irregularity vs. fractal dimension obtained by numerical calculations are given. An experiment for ultrasonic imaging by mapping the fractal dimension is described.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130323368","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
Equivalent circuit parameter extraction of SAW resonators SAW谐振器等效电路参数提取
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171411
B. Horine, D. Malocha
{"title":"Equivalent circuit parameter extraction of SAW resonators","authors":"B. Horine, D. Malocha","doi":"10.1109/ULTSYM.1990.171411","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171411","url":null,"abstract":"It is demonstrated that a useful and accurate model for high-frequency SAW (surface acoustic wave) resonators can be extracted by successive applications of the EIA-512 method. This extraction technique is an adaptation of the Electronic Industries Association (EIA) standard for measurement of the equivalent electrical parameters of quartz crystal units. This method is based on separating the complicated circuits into subcircuits of a form that the EIA-512 procedure can reduce. Bond wire inductance and resistance and package capacitance have been included in this fashion. Once these elements have been extracted from the high-frequency, package parasitic resonance data, their effects are subtracted from the main resonance data by Z- and Y-parameter manipulations. Longitudinal modes can also be extracted in this manner. Two resonators that support the validity of the theory and assumptions are presented.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130882761","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
Low phase noise quartz surface acoustic wave oscillators acceleration and barometric sensitivity optimization 低相位噪声石英表面声波振荡器加速度和气压灵敏度优化
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171344
F. Raymond, J. Desbois, S. Calisti, L. Penavaire, J. Gragnolati
{"title":"Low phase noise quartz surface acoustic wave oscillators acceleration and barometric sensitivity optimization","authors":"F. Raymond, J. Desbois, S. Calisti, L. Penavaire, J. Gragnolati","doi":"10.1109/ULTSYM.1990.171344","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171344","url":null,"abstract":"An analysis of the frequency sensitivity of various SAWR (surface acoustic wave resonator) structures to atmospheric pressure and vibration stresses is presented. The barometric sensitivity appears to be more stringent than the acceleration sensitivity. It is shown that, for a wide range of aspect ratio and package structure, a support shape which cancels sensitivity to the acceleration in one direction may be found. The optimization of both pressure and vibration sensitivity may not be easily obtained through such geometrical adjustment. The result is that a tradeoff must be found to optimize both acceleration and pressure sensitivity. Possible resonator configurations are discussed with regard to simultaneous pressure and acceleration sensitivity optimization.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128691133","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
Non-collinear acousto-electro-optic tunable filter configurations in LiNbO/sub 3/ LiNbO/sub / 3中非共线声光电可调滤波器配置
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171439
J.E.B. Oliveira, W. Serbena, E. Adler
{"title":"Non-collinear acousto-electro-optic tunable filter configurations in LiNbO/sub 3/","authors":"J.E.B. Oliveira, W. Serbena, E. Adler","doi":"10.1109/ULTSYM.1990.171439","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171439","url":null,"abstract":"A formulation which leads to the determination of wide angular aperture AEOTF (acousto-electro-optic tunable filter) configurations in LiNbO/sub 3/ crystals is developed. It is shown that for certain orientations of the bias electric field the LiNbO/sub 3/ crystal becomes optically biaxial. The Bragg angles of noncollinear tunable filter configurations in the artificially biaxial LiNbO/sub 3/ are determined explicitly and their dependences on the intensity of the bias electric field and the acoustic wave propagation direction are treated analytically. It is shown that for, bias electric field intensities widely used in LiNbO/sub 3/ devices, 10 kV/cm to 100 kV/cm, up to four noncollinear AEOTF configurations can be obtained for certain directions of acoustic wave propagation.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125835985","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
Measurements of SAW velocity by using divergent-beam ultrasound transducers 用散束超声换能器测量声表面波速度
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171520
K. Yamada, H. Sekiguchi, K. Nakamura
{"title":"Measurements of SAW velocity by using divergent-beam ultrasound transducers","authors":"K. Yamada, H. Sekiguchi, K. Nakamura","doi":"10.1109/ULTSYM.1990.171520","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171520","url":null,"abstract":"A SAW (surface acoustic wave) velocity measurement system that uses a pair of divergent-beam ultrasound transducers positioned in parallel with a specimen in a liquid is presented. Of the divergent wave emitted by the transmitter, a specific angular-spectrum component that is incident on a specimen at the Rayleigh critical angle excites a leaky SAW on the specimen surface. Of various angular-spectrum components of the reflected wave, the receiver selectively detects the specularly reflected wave and the reradiation of the leaky SAW. These two components take the same path when the specimen is brought to a specific position. Since the two components are in opposite phase at the position, their interaction causes a so-called null zone in the reflected beam and a corresponding intensity minimum is detected by the receiver.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126644757","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
Frequency mode charts of rectangular AT-cut quartz plates 矩形at切割石英板的频率模态图
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171423
M. Nakazawa, K. Horiuchi, H. Ito
{"title":"Frequency mode charts of rectangular AT-cut quartz plates","authors":"M. Nakazawa, K. Horiuchi, H. Ito","doi":"10.1109/ULTSYM.1990.171423","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171423","url":null,"abstract":"Experimental research on rectangular AT-cut quartz crystal plates has been conducted. In particular, resonant-frequency mode charts vs. length and width-to-thickness ratios for rectangular AT-cut plates were obtained experimentally, and the unwanted responses of a crystal oscillator controlled by an AT-cut plate were compared to results obtained from frequency mode charts. Frequency mode charts are compared with Mindlin's theory expanded with infinite power series of two-dimensional equations for the thickness-coordinate of the crystal plates.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126877340","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: 5
A membrane sampler for lithotripter monitoring 一种用于碎石机监测的膜取样器
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171644
C. Turner, H. Dabirikhah
{"title":"A membrane sampler for lithotripter monitoring","authors":"C. Turner, H. Dabirikhah","doi":"10.1109/ULTSYM.1990.171644","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171644","url":null,"abstract":"A simple membrane deflector is described that enables continuous monitoring of lithotripter shock-wave pulses to be achieved using standard hydrophones. The device discussed here comprises a thin planar plastic membrane supported by a rigid frame. The area of the membrane is chosen to intersect the whole cross section of the converging beam well in front of the focus. A thin membrane deflector is shown to allow the use of miniature hydrophones without risk of damage. Theoretical and experimental results are presented for several materials, and the conditions for accurate sampling of highly convergent wideband acoustic pulses are shown to be related to the behavior of leaky Lamb waves in immersed plates.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127217892","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
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