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An automated ultrasonic exposure system to assess the effects of in utero diagnostic ultrasound 一种用于评估子宫超声诊断效果的自动超声暴露系统
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171593
N. Smith, C. Vorhees, R. Meyer, W. O’Brien
{"title":"An automated ultrasonic exposure system to assess the effects of in utero diagnostic ultrasound","authors":"N. Smith, C. Vorhees, R. Meyer, W. O’Brien","doi":"10.1109/ULTSYM.1990.171593","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171593","url":null,"abstract":"An ultrasound exposimetry system was designed and constructed to expose rat embryos and fetuses to ultrasound. The unique feature of the exposure system is that it insonates pregnant rats which are not anesthetized or otherwise restrained. The rats were trained to float in a restricted area directly above the submerged ultrasound transducer. The water tank was designed to confine the floating rat to a 15-cm*10-cm region while being exposed to ultrasound. The ultrasound transducer operating in either pulsed or continuous-wave (CW) mode is submerged below the animal and moved in a raster fashion to irradiate the entire abdominal area. Computer control of the exposure system and the ultrasound intensity levels allow for the experiments to be conducted in a blind fashion. Using a calibrated hydrophone, pressure waveforms are obtained from which the free-field I/sub SPTA/ and I/sub SPTP/ are calculated at the distance of the rat's abdomen.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"61 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":"124374511","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
Ultrasonic instrument to predict drawability of sheet metal 预测金属薄板拉伸性的超声波仪器
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171514
E. Papadakis, R. Thompson, D. Bluhm, S.J. Wormley, H.D. Skank, K. Forouraghi, G. Alers
{"title":"Ultrasonic instrument to predict drawability of sheet metal","authors":"E. Papadakis, R. Thompson, D. Bluhm, S.J. Wormley, H.D. Skank, K. Forouraghi, G. Alers","doi":"10.1109/ULTSYM.1990.171514","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171514","url":null,"abstract":"An ultrasonic instrument has been designed and fabricated to predict drawability of sheet metal. Using S/sub 0/ mode Lamb waves generated and detected by EMATs (electromagnetic-acoustic transducers), the instrument automatically measures ultrasonic phase delay in three directions: 0 degrees , 45 degrees , and 90 degrees with respect to the rolling direction. The delay is measured by a Fourier transform phase-versus-frequency slope algorithm applied to flash AD recorded EMAT signals. From the delays, the computer-based instrument calculates velocities and the directional Young's modulus E(O) in the rolling plane. From the average E in the plane, a correlation curve is used to find the average plastic strain ratio, which is the drawability prediction parameter.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"105 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":"117229063","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 2-dimensional Fourier transform method for the quantitative measurement of Lamb modes 兰姆模态定量测量的二维傅里叶变换方法
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171541
D. Alleyne, P. Cawley
{"title":"A 2-dimensional Fourier transform method for the quantitative measurement of Lamb modes","authors":"D. Alleyne, P. Cawley","doi":"10.1109/ULTSYM.1990.171541","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171541","url":null,"abstract":"The key problem associated with the quantitative measurement of the characteristics of propagating Lamb waves is that more than one wave mode can exist at any given frequency. Therefore, a simple Fourier transformation from the time to the frequency domain cannot distinguish between the different modes. A 2-D Fourier transform technique involving both spatial and time transformations from which the required information can be obtained is presented. The results obtained from both numerical and experimental investigations of Lamb waves propagating in steel plates are presented using an isometric projection, which gives a 3-D view of the wave-number dispersion curves. The results show the effectiveness of using the 2-D Fourier transform method to identify and measure the amplitudes of individual Lamb modes.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":" 812","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120829203","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: 106
Spectral evaluation of ultrasonic flaw echoes using Wigner distribution 基于Wigner分布的超声缺陷回波光谱评价
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171487
K. Chin, X.M. Jin, J. Saniie
{"title":"Spectral evaluation of ultrasonic flaw echoes using Wigner distribution","authors":"K. Chin, X.M. Jin, J. Saniie","doi":"10.1109/ULTSYM.1990.171487","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171487","url":null,"abstract":"The performance of the Wigner distribution (WD) is evaluated using several simulated ultrasonic signals. In particular, the WD is used for detecting flaw echoes and characterizing dispersive signals backscattered from inhomogeneous materials. These signals were also characterized using short-time Fourier transform (STFT), and results indicate that STFT outperforms WD. It is concluded that the overall performance of WD is appealing, especially in the case of dispersive signals (i.e. raised cosine chirp) and modulated Gaussian functions, which all yield accurate estimations of the frequency content. However, the WD of the ultrasonic grain signal fails to reveal satisfactory results due to the cross terms, and the detection of flaws is not a trivial task.<<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":"120950183","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
Development of the rule base for a design automation system for SAW filters using bidirectional transducers 基于双向换能器的SAW滤波器设计自动化系统规则库的开发
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171343
S. M. Richie, M.J. McCollister, D. Malocha
{"title":"Development of the rule base for a design automation system for SAW filters using bidirectional transducers","authors":"S. M. Richie, M.J. McCollister, D. Malocha","doi":"10.1109/ULTSYM.1990.171343","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171343","url":null,"abstract":"A design automation system, called SAWCOM, has been developed for the noninteractive design and analysis of SAW (surface acoustic wave) filters using bidirectional transducers. Such a system increases productivity by reducing filter design time while increasing design accuracy. The SAWCOM system takes as input a high-level performance specification of the SAW filter to be designed, as well as parameters pertaining to substrate availability and fabrication capabilities, and then begins a synthesis-analysis-verification cycle which continues until all design alternatives that meet the specifications are found, within the constraints of the SAWCOM system. To determine the filter's design parameters, the system uses a set of design rules implemented in the PROLOG language.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"125 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":"127211799","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
Moisture effects on the ultrasonic velocities in woods 木材中水分对超声波速度的影响
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171533
A. Minamisawa, A. Ozawa, H. Sakai, K. Takagi
{"title":"Moisture effects on the ultrasonic velocities in woods","authors":"A. Minamisawa, A. Ozawa, H. Sakai, K. Takagi","doi":"10.1109/ULTSYM.1990.171533","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171533","url":null,"abstract":"Velocities of 1-MHz ultrasonic waves were measured intermittently for several kinds of wood specimens of varying water content. Results generally show that, with increasing water content up to some point (typically about 30%), the velocities decrease rather sensitively and that this point coincides with the one previously known as the fiber saturation point. Velocity measurements were also performed in three orthogonal directions relative to the fiber axis of wood specimens which were being dried (or moistened) and hence had nonuniform humidity distributions. Rates of water transfer in woods estimated from the measurements are discussed in terms of diffusion theory and the internal structure of woods.<<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":"123748197","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
Analysis of thin rod acoustic wave gravimetric sensors 细杆声波重力传感器分析
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171383
Z. Wang, M. Viens, C. Jen, J. Cheeke, Y. Liu
{"title":"Analysis of thin rod acoustic wave gravimetric sensors","authors":"Z. Wang, M. Viens, C. Jen, J. Cheeke, Y. Liu","doi":"10.1109/ULTSYM.1990.171383","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171383","url":null,"abstract":"An analysis based on a perturbation theory for evaluating the mass sensitivity, S/sub m/, for acoustic wave gravimetric sensors made of thin rods is presented. The lowest order flexural, F/sub 11/, torsional T/sub 01/ and longitudinal L/sub 01/ acoustic modes are of interest. The mass sensitivity is found to be -1/2 rho /sub s/a, -2/ rho /sub s/a, and -1/ rho /sub s/a for F/sub 11/, T/sub 01/, and L/sub 01/ mode, respectively.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"174 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":"122629322","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
Sound behavior in high T/sub c/ superconductor Bi-Sr-Ca-Cu-O 高T/亚c/超导体Bi-Sr-Ca-Cu-O中的声特性
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171571
K. Sun, F. R. Parker, W. Winfree, H. I. Syed, R. Meng, Y. Sun, P. Hor, C. Chu
{"title":"Sound behavior in high T/sub c/ superconductor Bi-Sr-Ca-Cu-O","authors":"K. Sun, F. R. Parker, W. Winfree, H. I. Syed, R. Meng, Y. Sun, P. Hor, C. Chu","doi":"10.1109/ULTSYM.1990.171571","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171571","url":null,"abstract":"Temperature-dependent ultrasound measurements were performed on a two-phased sintered sample of Bi-Sr-Ca-Cu-O. Attenuation anomalies and velocity changes were observed for 10-MHz longitudinal waves around the two superconducting phase transitions. These features of sound behavior at T/sub c/, also observed in other 90-K high-T/sub c/ systems, may result from the direct interaction of intrinsic properties of high-temperature superconductors with sound. A spin-phonon interaction is proposed to interpret the acoustic behavior.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"129 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":"122985425","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
Real-time phased array imaging using digital beam forming and autonomous channel control 采用数字波束形成和自主通道控制的实时相控阵成像
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171616
M. O’Donnell, W. Engeler, J. T. Pedicone, Ahmad M. Itani, S. Noujaim, R. Dunki-Jacobs, W. Leue, C. Chalek, L. Smith, J. Piel, R. L. Harris, K. Welles, W. Hinrichs
{"title":"Real-time phased array imaging using digital beam forming and autonomous channel control","authors":"M. O’Donnell, W. Engeler, J. T. Pedicone, Ahmad M. Itani, S. Noujaim, R. Dunki-Jacobs, W. Leue, C. Chalek, L. Smith, J. Piel, R. L. Harris, K. Welles, W. Hinrichs","doi":"10.1109/ULTSYM.1990.171616","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171616","url":null,"abstract":"The authors designed and constructed a real-time phased-array imaging system for medical applications based on the principles of digital beam formation and autonomous channel control. The system is capable of high-precision steering, dynamic apodization, dynamic focusing, and highly accurate beamforming using sampling rates close to the Nyquist rate over the medical diagnostic frequency range. All controls and signal processing needed for a single channel of the array imager have been integrated into a single custom VLSI circuit. The authors describe the basic principles embodied in this chip.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"29 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":"114500964","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: 76
Bleustein-Gulyaev wave propagation under periodic metal gratings 周期性金属光栅下的Bleustein-Gulyaev波传播
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171347
V. Bright, W. Hunt
{"title":"Bleustein-Gulyaev wave propagation under periodic metal gratings","authors":"V. Bright, W. Hunt","doi":"10.1109/ULTSYM.1990.171347","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171347","url":null,"abstract":"Bluestein-Gulyaev (BG) piezoelectric surface wave propagation under a periodic metal strip grating on piezoelectric cubic crystals is investigated. A general theory that fits both the elastic and the electric periodic boundary conditions has been developed. Numerical examples are given for aluminum and gold shorted gratings on a GaAs substrate. It is found that the BG waves which penetrate deep into the substrate in the absence of the metal grating become trapped at the surface when the grating is present, and the depth of penetration is heavily dependent on the metal thickness. The relevant physical quantities, such as particle displacement and dispersion curves, are also computed and analyzed. The velocities of BG waves under grating structures are greater than those of surface acoustic wave modes, and thus devices that operate at higher frequencies with the same grating periods can be implemented.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"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":"126974067","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
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