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IEEE Symposium on Ultrasonics最新文献

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Examination of objects made of wood using air-coupled ultrasound 用空气耦合超声检查木质物体
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171532
C. Fortunko, M. Renken, A. Murray
{"title":"Examination of objects made of wood using air-coupled ultrasound","authors":"C. Fortunko, M. Renken, A. Murray","doi":"10.1109/ULTSYM.1990.171532","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171532","url":null,"abstract":"The authors describe an experimental air-coupled, ultrasonic measurement system that can be used to study the propagation of megahertz signals in wooden plates ranging in thickness from 3 to 25 mm. They also report experimental measurements of the amplitude of transmitted, narrowband, 0.5-MHz signals as a function of the angle of incidence for different grain orientations. They compare the experimental results for balsa and poplar with results obtained on plates made of polymethyl methacrylate (PMMA). They interpret the results using a slowness-surface approach.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"38 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":"121202925","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: 20
Depth profiling in piezoelectric photoacoustic imaging: theory and experiment 压电光声成像中的深度剖面:理论与实验
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171448
Yaochun Shen, Shu-Yi Zhang, Yueyue Lu, Bufa Zhang
{"title":"Depth profiling in piezoelectric photoacoustic imaging: theory and experiment","authors":"Yaochun Shen, Shu-Yi Zhang, Yueyue Lu, Bufa Zhang","doi":"10.1109/ULTSYM.1990.171448","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171448","url":null,"abstract":"The depth profiling of piezoelectric photoacoustic (PA) imaging is studied experimentally and theoretically. In the experiment, the PA signals and the layered PA images of semiconductor materials and devices are obtained by adjusting the phase shift. In order to explain the experimental results, a one-dimensional multilayered model with discontinuous thermal impedance between the neighboring layers is used, and expressions for the thermal and acoustic fields in the sample and PZT transducer are presented. Numerical calculations in agreement with practical experimental conditions have been carried out.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"26 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":"121343703","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
The study of polyimide films and adhesion using a surface acoustic wave sensor 用表面声波传感器研究聚酰亚胺薄膜及其附着力
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171529
D. Galipeau, C. Feger, J. Vetelino, R. Lec
{"title":"The study of polyimide films and adhesion using a surface acoustic wave sensor","authors":"D. Galipeau, C. Feger, J. Vetelino, R. Lec","doi":"10.1109/ULTSYM.1990.171529","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171529","url":null,"abstract":"A dual delay line surface acoustic wave (SAW) sensor on an ST-quartz substrate has been used to study water uptake and downtake and its effect on adhesion in both cured and uncured polyimide films. Particular attention is focused on the effect that an adhesion promoter may have on the strength of the adhesive bond. Film samples both with and without an adhesion promoter were studied. The experimental results suggest the possibility of using a SAW sensor as a cure indicator, humidity sensor, or adhesion sensor.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"53 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":"121423276","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: 10
A new principle of diffraction-diffraction theory for solid obstacles 固体障碍物衍射理论的新原理
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171416
M. Ueda
{"title":"A new principle of diffraction-diffraction theory for solid obstacles","authors":"M. Ueda","doi":"10.1109/ULTSYM.1990.171416","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171416","url":null,"abstract":"A novel principle of diffraction in which an observation point acts as the center of the diffraction phenomenon is proposed. In the conventional theory a point source acts as the center. By combining the novel principle with the concept of diffraction in mirror images, a diffraction theory for polyhedrons is formulated, and it is applied to a semi-infinite plane. The far-field solutions obtained with this principle are compared with Kirchoff's theory.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"12 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":"124146707","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 computed tomography considerations in the NDE of solid materials 固体材料无损检测中的超声计算机断层扫描
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171511
J. Rose, J. Ditri
{"title":"Ultrasonic computed tomography considerations in the NDE of solid materials","authors":"J. Rose, J. Ditri","doi":"10.1109/ULTSYM.1990.171511","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171511","url":null,"abstract":"A research effort was carried out to assess the feasibility of utilizing ultrasonic computed tomography (UCT) to determine quantitatively the porosity content and distribution within various test specimens. Index of refraction (or velocity) tomography, as opposed to attenuation tomography, was used because of the many complications encountered when using the latter and its inherent inconsistency in determining porosity content. It is demonstrated that, with suitable measures taken to account for beam refraction and other related effects, ultrasonic tomography could indeed be used for porosity location and quantification.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"108 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":"132111049","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
The van Cittert-Zernike theorem in pulsed ultrasound-implications for ultrasonic imaging 脉冲超声中的van Cittert-Zernike定理——超声成像的意义
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171639
R. Mallert, Mathias Fink
{"title":"The van Cittert-Zernike theorem in pulsed ultrasound-implications for ultrasonic imaging","authors":"R. Mallert, Mathias Fink","doi":"10.1109/ULTSYM.1990.171639","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171639","url":null,"abstract":"A classical theorem of statistical optics, the van Cittert-Zernike theorem, is generalized to pulse-echo ultrasound. This theorem fully describes the second-order statistics of the spatial fluctuations (the spatial covariance) of the field produced by an incoherent source. As a random scattering medium is insonified, it behaves as an incoherent source. The van Cittert-Zernike theorem can thus predict the spatial covariance of the pressure field backscattered by a random medium. Experimental results obtained with a linear array are in good agreement with theoretical expectations. The implications of this theorem in speckle reduction and in focusing in nonhomogeneous media are discussed.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"94 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":"129980962","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
An ultrasonic transducer apodized by polarization 一种利用极化技术的超声波换能器
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171477
K. Kawabe, Y. Hara, K. Watanabe, T. Shimura
{"title":"An ultrasonic transducer apodized by polarization","authors":"K. Kawabe, Y. Hara, K. Watanabe, T. Shimura","doi":"10.1109/ULTSYM.1990.171477","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171477","url":null,"abstract":"In attempting to improve the quality of images produced by ultrasonic diagnostic equipment, the authors tried to narrow the width of the ultrasound beam in the scanning direction and the short axis perpendicular to the scanning direction, and to shorten the pulse duration. The beamwidth, especially in the short axis, is markedly broad. To narrow the width, the transmitting acoustic sound pressure was apodized by polarizing the piezoelectric ceramic element of an array-type transducer in a stepped manner. A transducer using this apodization had its beamwidth decreased from 50% to 80% compared to the conventional transducer.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"119 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":"133887016","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
Frequency stability of high overtone bulk acoustic resonators 高泛音体声谐振器的频率稳定性
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171417
D. Bailey, M. Driscoll, R. Jelen, B. R. Mcavoy
{"title":"Frequency stability of high overtone bulk acoustic resonators","authors":"D. Bailey, M. Driscoll, R. Jelen, B. R. Mcavoy","doi":"10.1109/ULTSYM.1990.171417","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171417","url":null,"abstract":"The authors report the results of phase noise measurements for high overtone bulk acoustic resonators (HBARs) operating at 640 MHz with insertion losses of 10-15 dB and unmatched Qs greater than 110 K. Noise measurements made on these resonators with input drive levels of 16 dBm have shown self-noise levels of S/sub y/(f=100 Hz)=8.0*10/sup -26/ for 1/f noise, which represents the state-of-the-art for a UHF resonator. It is concluded that HBAR technology provides the means for generating UHF and microwave signals exhibiting short-term frequency stability superior to that obtainable using quartz resonator based sources.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"24 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":"126595573","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
Positioning characteristics of ultrasonic rotary actuator with two mode operation 双模工作的超声旋转执行器定位特性
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171552
M. Umeda, T. Nakazawa, K. Ohnishi, K. Nakamura, M. Kurosawa, S. Ueha
{"title":"Positioning characteristics of ultrasonic rotary actuator with two mode operation","authors":"M. Umeda, T. Nakazawa, K. Ohnishi, K. Nakamura, M. Kurosawa, S. Ueha","doi":"10.1109/ULTSYM.1990.171552","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171552","url":null,"abstract":"A trial ultrasonic rotary actuator to be applied as a precision positioning controller is presented. Using the actuator, which consists of a longitudinal multilayered piezoelectric actuator (LMPA) and a torsional multilayered piezoelectric actuator (TMPA), the angular positioning characteristics were studied. The actuator is driven by two modes, that is, dynamic and static operations. Employing the two mode operations in a complementary manner, the angular positioning has been successfully proved to be quickly controlled with an excellent accuracy of 1 arcsec +or- 0.5 arcsec.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"46 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":"132923935","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
Ultrasonic experiments at ultra-high frequency with picosecond time-resolution 超高频皮秒级时间分辨率超声实验
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171573
H. Lin, R. Stoner, H. Maris
{"title":"Ultrasonic experiments at ultra-high frequency with picosecond time-resolution","authors":"H. Lin, R. Stoner, H. Maris","doi":"10.1109/ULTSYM.1990.171573","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171573","url":null,"abstract":"A method that can be used to make ultrasonic measurements with picosecond time resolution is described. In this method, short light pulses (duration <or=1 ps) are used to generate and detect ultrasonic waves. The excellent time resolution makes possible pulse-echo ultrasonic measurements in situations in which the acoustic path length is extremely short. It is possible to make ultrasonic pulse-echo measurements on thin-film microstructures of thicknesses down to a few hundred angstroms. As examples of the use of the method, measurements of sound propagation in glass films at frequencies up to 500 GHz, studies of the mechanical properties of microstructures, and investigations of high-frequency surface waves are described.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"16 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133356840","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
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