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Proceedings. IEEE Ultrasonics Symposium最新文献

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Experimental approach of the diffraction effect with random phase transducers 随机相位传感器衍射效应的实验研究
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67148
G. Berger, P. Laugier, S. Abouelkaram, P. Bonnin, M. Fink, F. Rieuneau
{"title":"Experimental approach of the diffraction effect with random phase transducers","authors":"G. Berger, P. Laugier, S. Abouelkaram, P. Bonnin, M. Fink, F. Rieuneau","doi":"10.1109/ULTSYM.1989.67148","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67148","url":null,"abstract":"The continuous evolution of the estimated attenuation with respect to the distance between the probe and the sample was evaluated on a foam phantom. Results show large changes rapidly occurring because of the diffraction effect. Random phase transducers (RPTs) were then introduced for attenuation estimation. RPT can be partially or totally incoherent. New diffraction-calibration curves show that no diffraction occurs with the RPT, all the more as they are totally incoherent. As a consequence, the attenuation is very stable as a function of the probe-sample distance. These observations were confirmed through in vitro measurements on human placentas.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"28 1","pages":"1043-1046 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85165776","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
Measurement of shock waves in the focus of a lithotripter 碎石机焦点处冲击波的测量
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67137
B. Granz, R. Holzapfel, G. Kohler
{"title":"Measurement of shock waves in the focus of a lithotripter","authors":"B. Granz, R. Holzapfel, G. Kohler","doi":"10.1109/ULTSYM.1989.67137","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67137","url":null,"abstract":"For the measurement of ultrasonic shock waves with amplitudes near 40 MPa, two different hydrophones were constructed. The first is a high-bandwidth PVDF membrane hydrophone with a capacitively coupled signal. The second is a small acousto-optic fiber hydrophone which measures the shock-wave-induced variation of the refractive index of a liquid at the front end of the fiber. The properties of the hydrophones are compared. The first, with a sensitivity of 6 mV/MPa, demonstrates high durability and a 20-MHz bandwidth. The second has equally good characteristics and additionally measures the creation and the time dependence of cavitation bubbles in the liquid.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"52 4 1","pages":"991-994 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91126859","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
Non-collinear acousto-optical tunable filter configurations in biaxial crystals 双轴晶体中的非共线声光可调滤波器配置
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67040
J.E.B. Oliveira, W. Serbena, E. Adler
{"title":"Non-collinear acousto-optical tunable filter configurations in biaxial crystals","authors":"J.E.B. Oliveira, W. Serbena, E. Adler","doi":"10.1109/ULTSYM.1989.67040","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67040","url":null,"abstract":"A novel formulation of acoustooptic interactions is presented for predicting the Bragg angles of noncollinear acoustooptic tunable filter (AOTF) configurations in biaxial crystals. The Bragg angles of AOTF configurations in which the interaction plane contains both optical axes are determined explicitly and their dependence with respect to the refractive indices and the acoustic-wave propagation direction are treated analytically. It is shown that, in biaxial crystals, up to four noncollinear AOTF configurations can be obtained for certain directions of propagation of the acoustic wave; for any direction of propagation of the acoustic wave, at least two noncollinear configurations are always allowed. There are major differences between AOTF features obtained in biaxial crystals and those obtained in uniaxial crystals. The Bragg angles of noncollinear AOTF configurations in Tl/sub 3/AsS/sub 4/ are determined as an illustrative example. Tl/sub 3/AsS/sub 4/ is biaxial crystal that yields a very high acoustooptic figure of merit and which is highly transparent in the 0.6-10- mu m optical range. For this material the acoustooptic coefficients which may be involved in the AOTF configurations are given.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"28 1","pages":"525-529 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89532950","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
Effect of SAW frequency on transverse acoustoelectric voltage measurements 声表面波频率对横向声电电压测量的影响
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66969
F. Palma, G. de Cesare, P. Das, A. Abbate
{"title":"Effect of SAW frequency on transverse acoustoelectric voltage measurements","authors":"F. Palma, G. de Cesare, P. Das, A. Abbate","doi":"10.1109/ULTSYM.1989.66969","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.66969","url":null,"abstract":"The effect of trapped charges on transverse acoustoelectric voltage is investigated with the aim of extending the use of this measurement to the study of semiconductors with a high defect density, e.g. amorphous materials. Even when SAW (surface acoustic wave) frequencies range from 50 to 100 MHz, the effect due to charge trapping can be relevant. This effect has been verified on a damaged Si/SiO/sub 2/ structure, measuring transverse acoustoelectric voltage (TAV) vs. bias voltage at two different frequencies using the fundamental and odd harmonics of the SAW delay line. Measurements show that TAV vs V plots obtained at the fundamental frequency are different from those obtained at the higher frequency. This variation is related to the different influences of traps at low and high frequency. A theoretical model is proposed to explain this frequency dependence.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"27 1","pages":"117-120 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73449900","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
The role of piezocomposites in ultrasonic transducers 压电复合材料在超声换能器中的作用
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67088
Wallace Arden Smith
{"title":"The role of piezocomposites in ultrasonic transducers","authors":"Wallace Arden Smith","doi":"10.1109/ULTSYM.1989.67088","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67088","url":null,"abstract":"Combining a piezoelectric ceramic and a passive polymer to form a piezocomposite allows the transducer engineer to design new piezoelectrics that offer substantial advantages over the conventional piezoelectric ceramics and polymers. The rod composite geometry provides materials with enhanced electromechanical coupling and with acoustic impedance close to that of tissue; these factors yield transducers for medical ultrasonic imaging with high sensitivity and compact impulse response. The dice-and-fill technique produces piezocomposites that can be readily formed into complex shapes to facilitate focusing the ultrasonic beam. Proper design of the rod spacing yields materials that exhibit low crosstalk between array elements formed by patterning the electrode alone, without cutting between the elements. In this way, curved annular arrays have been made that provide high-quality clinical images of substantial diagnostic value to physicians. Included is an extensive bibliography of papers documenting the role of piezocomposites in ultrasonic imaging transducers.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"47 1","pages":"755-766 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76639803","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: 256
Higher harmonic surface transverse wave filters 高次谐波表面横波滤波器
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66988
B. Fleischmann, H. Skeie
{"title":"Higher harmonic surface transverse wave filters","authors":"B. Fleischmann, H. Skeie","doi":"10.1109/ULTSYM.1989.66988","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.66988","url":null,"abstract":"The operation of SAW (surface acoustic waves) filters at high spatial harmonics was investigated theoretically and experimentally. Transducers with constant geometric period were chosen for reasons of manufacturability and predictability of electrical characteristics. An analytical method was used to calculate the transducers' relative coupling coefficient. Bulk-wave conversion losses, which are very important for higher-harmonic and STW (surface transverse wave) resonator design considerations, were calculated with two different techniques, a perturbation model and an antenna model. The results show very good agreement with measurements. Various transducer types were realized using the STW on AT-cut quartz, which has higher propagation velocity and lower bulk-wave conversion loss than the Rayleigh wave. A highly developed standard photolithographic process was used for the reproducible fabrication of delay lines with center frequencies up to 2.78 GHz, Q values of 3400 at 2.65 GHz, and an unmatched insertion loss of 15 dB at 2.49 GHz.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"14 1","pages":"235-239 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75380559","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
Structure noise reduction and deconvolution of ultrasonic data using wavelet decomposition (ultrasonic flaw detection) 基于小波分解的超声数据结构降噪与反卷积(超声探伤)
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67167
J. Aussel, J. Monchalin
{"title":"Structure noise reduction and deconvolution of ultrasonic data using wavelet decomposition (ultrasonic flaw detection)","authors":"J. Aussel, J. Monchalin","doi":"10.1109/ULTSYM.1989.67167","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67167","url":null,"abstract":"The split-spectrum processing (SSP) technique is known to improve flaw detection in materials in which the coarse microstructure produces broadband noise of large amplitude, which masks useful signals. It is shown that the spectral decomposition used in the SSP is equivalent to the time-frequency Gabor decomposition. A generalized SSP based on a wavelet decomposition, in which the received signal is decomposed over a basis of elementary wavelets translated in frequency and dilated in time, and followed as in the conventional SSP by an optimization algorithm is introduced. The flexibility in the choice of the wavelet basis allows implementation of efficient signal decomposition. Three wavelet bases are presented: Gaussian-shaped wavelets, binary wavelets, and autoregressive wavelets. Applications of the SSP with wavelet decomposition to noise reduction and deconvolution are illustrated with experimental and simulated data.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"147 1","pages":"1139-1144 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74495869","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
SAW propagation on proton-exchanged lithium niobate 质子交换铌酸锂上SAW的传播
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66995
E. Biebl, P. Russer, K. Anemogiannis
{"title":"SAW propagation on proton-exchanged lithium niobate","authors":"E. Biebl, P. Russer, K. Anemogiannis","doi":"10.1109/ULTSYM.1989.66995","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.66995","url":null,"abstract":"A novel method using only the easily measured velocity of SAWs (surface acoustic waves) is demonstrated for determination of elastic constants of anisotropic layers on arbitrarily anisotropic and piezoelectric substrates. The elastic constants and propagation properties of any nonpiezoelectric isotropic, cubic, or even trigonal layer on an arbitrarily anisotropic substrate can be determined with this method. The method was applied to proton-exchanged (PE) lithium niobate in order to determine its as yet unknown elastic constants. Dispersion curves and elastic stiffness constants of PE Y-cut LiNbO/sub 3/ have been evaluated. The results are reliable for waveguides fabricated in diluted melts containing 0.25-2.00 mol.% lithium benzoate. Using the obtained elastic-stiffness constants, SAW propagation properties such as power flow, diffraction, and strain distribution can be analyzed in order to achieve sophisticated design of guided SAW and acoustooptic devices based on PE:LiNbO/sub 3/ waveguides.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"3 1","pages":"281-284 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81930938","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
Ultrasonic nondestructive evaluation of solid-solid bonds 固体-固体键的超声无损评价
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67163
R. Thompson, O. Buck, D.K. Rebhein, F. Margetan, T. Gray
{"title":"Ultrasonic nondestructive evaluation of solid-solid bonds","authors":"R. Thompson, O. Buck, D.K. Rebhein, F. Margetan, T. Gray","doi":"10.1109/ULTSYM.1989.67163","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67163","url":null,"abstract":"The solid-state bonding of metals, e.g. diffusion bonding, friction welding, and inertial welding, is finding increasing use in the fabrication of structural components. A summary is presented of recent progress toward the development of nondestructive techniques to monitor the quality of such bonds. Emphasis is placed on the characterization of a particular microstructural origin of bond weakness, a distributed array of microcracks in the bond plane. Included is a discussion of theories for the interaction of ultrasound with such distributed defects, results of model experiments designed to validate the theories, and applications of techniques based on the resulting understanding to fracture studies of bonded surfaces and to inspection of aircraft engine turbine rotors.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"65 1","pages":"1117-1123 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84709077","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
SAFT processing of noncontact ultrasonic NDE data 非接触式超声无损检测数据的SAFT处理
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67067
D. Hutchins, S. M. Kramer, C. Saleh
{"title":"SAFT processing of noncontact ultrasonic NDE data","authors":"D. Hutchins, S. M. Kramer, C. Saleh","doi":"10.1109/ULTSYM.1989.67067","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67067","url":null,"abstract":"Ultrasonic data have been obtained by scanning a pulsed EMAT (electromagnetic acoustic transducer) detector over the surface of an aluminum sample containing artificial defects. The annular EMAT was concentric with the source to imitate pulse-echo systems. Reflection data were processed using SAFT (synthetic-aperture focusing technique) methods, to give images of the defects. Details are given on modifications to the usual SAFT approach, to compensate for the finite EMAT aperture.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"95 1","pages":"661-664 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85294618","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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