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IEEE Symposium on Ultrasonics最新文献

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Piezoelectric properties of 1-3 composites of a calcium-modified lead titanate in epoxy resins 环氧树脂中钙修饰钛酸铅1-3复合材料的压电性能
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171455
Robert Y. Ting, Avner A. Shaulov, Wallace A. Smith
{"title":"Piezoelectric properties of 1-3 composites of a calcium-modified lead titanate in epoxy resins","authors":"Robert Y. Ting, Avner A. Shaulov, Wallace A. Smith","doi":"10.1109/ULTSYM.1990.171455","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171455","url":null,"abstract":"A series of 1-3 piezocomposite samples was fabricated by using lead titanate ceramic with a dice-and-fill technique. The ceramic rods were approximately 0.10 mm in size, and the ceramic volume fraction varied from 10% to 30%. Two different epoxy resins were used. The piezoelectric d/sub h/ and g/sub h/ coefficients of the composites were found to be stable with pressure from ambient to 20 MPa. The temperature dependence of the composite properties was similar to that of the solid ceramic. The free-field voltage sensitivity of a prototype hydrophone made from the composite was calibrated and shown to be constant up to 6 kHz.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"4 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":"133506401","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: 9
Lithotripsy pulse measurement errors due to non-ideal hydrophone and amplifier frequency response 由非理想水听器和放大器频率响应引起的碎石脉冲测量误差
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171595
G. Harris
{"title":"Lithotripsy pulse measurement errors due to non-ideal hydrophone and amplifier frequency response","authors":"G. Harris","doi":"10.1109/ULTSYM.1990.171595","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171595","url":null,"abstract":"To study the potential effects of bandwidth-limited behavior on lithotripsy pulse measurements, the mathematical model for diagnostic-type pulses of G.R. Harris (1989) was modified. Several parameters of a simulated lithotripsy pulse were compared before and after being filtered by hydrophone and amplifier response functions, both separately and in combination. Errors were computed for the peak positive and negative pressures, rise-time, pulse duration, and pulse intensity integral as functions of hydrophone and amplifier bandwidths. Although most of the energy in a shock wave pulse lies at frequencies below a few megahertz, significant errors can occur unless measurement bandwidths are much wider. However, accuracy for the combined response can be maintained at lower bandwidths if the amplifier's cutoff frequency is less than the hydrophone's thickness resonance peak.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"8 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":"128881629","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
NDE of multilayer ceramic chip capacitors based on acoustic waveguides excitation 基于声波导激励的多层陶瓷片电容器无损检测
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171530
M. Abedin, J. Heyman, K. J. Sun, F. R. Parker
{"title":"NDE of multilayer ceramic chip capacitors based on acoustic waveguides excitation","authors":"M. Abedin, J. Heyman, K. J. Sun, F. R. Parker","doi":"10.1109/ULTSYM.1990.171530","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171530","url":null,"abstract":"An acoustic waveguide technique is investigated as a potential tool for detecting delaminations, voids, or microcracks in multilayer ceramic chip capacitors. The technique uses acoustic transducers mounted on tapered buffer rods to excite and to detect acoustic waves in a capacitor. The points of the transmitting and receiving buffer rods are brought in contact with the opposite ends of the capacitors, and a pulse excitation is applied. For a defect-free sample, the received acoustic signal is a series of echoes representing reverberations within the capacitor. The presence of defects in the capacitor changes the acoustic propagation properties, resulting in changes in the measured echo train. A series of experiments was performed for a number of capacitors to verify the potential of acoustic waveguide coupling.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"23 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":"127646998","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
Development of 800 MHz band SAW filters using weighting for the number of finger pairs 使用手指对数加权的800 MHz频带SAW滤波器的开发
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171330
O. Ikata, Y. Satoh, T. Miyashita, T. Matsuda, Y. Fujiwara
{"title":"Development of 800 MHz band SAW filters using weighting for the number of finger pairs","authors":"O. Ikata, Y. Satoh, T. Miyashita, T. Matsuda, Y. Fujiwara","doi":"10.1109/ULTSYM.1990.171330","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171330","url":null,"abstract":"A surface acoustic wave (SAW) bandpass filter has been developed for pocket and mobile telephones for 800-MHz-band cellular radio systems. In developing this filter, it was found that the number of finger pairs suppressed the sidelobe. The number of finger pairs was varied for each input and output transducer which composed an interdigitated interdigital transducer (IIDT) structure. The proportion of weighting for the number of finger pairs was optimized using computer simulation. A transmitting filter for AMPS was constructed using this method. Sidelobe suppression improved to above 8 dB compared to no weighting. Absolute suppression was less than -24 dB. This filter has properties suitable for practical use in a temperature range from -30 to +70 degrees C.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"28 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":"131660808","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
Design, fabrication and characterization of wideband high diffraction efficiency phased array Bragg cells 宽带高衍射效率相控阵Bragg电池的设计、制造与表征
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171450
S. Chinn, D. Henderson
{"title":"Design, fabrication and characterization of wideband high diffraction efficiency phased array Bragg cells","authors":"S. Chinn, D. Henderson","doi":"10.1109/ULTSYM.1990.171450","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171450","url":null,"abstract":"The fundamental design issues associated with wideband, high-diffraction-efficiency phased-array Bragg cells are addressed. Also discussed are the key fabrication steps necessary to obtain optimal results. TRW has fabricated and tested 1-GHz-bandwidth (f/sub c/=2.5 GHz), 2-GHz bandwidth (f/sub c/=2.0 GHz), and 2-GHz-bandwidth (f/sub c/=3.0 GHz) GaP longitudinal-mode Bragg cells. Results presented include diffraction efficiency (30%/RF watt, 1-GHz-bandwidth) (8%/RF watt, 2-GHz-bandwidth), two-tone third-order intermodulation products, and frequency response.<<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":"115684068","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
The elastic properties of thin-film silicon nitride 薄膜氮化硅的弹性性能
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171405
T. Hickernell, F. Fliegel, F. Hickernell
{"title":"The elastic properties of thin-film silicon nitride","authors":"T. Hickernell, F. Fliegel, F. Hickernell","doi":"10.1109/ULTSYM.1990.171405","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171405","url":null,"abstract":"The elastic properties of thin-film silicon nitride (Si/sub 3/N/sub 4/) were investigated using surface-acoustic-wave (SAW) propagation data for plasma-enhanced chemical-vapor-deposition (PECVD) grown Si/sub 3/N/sub 4/ on gallium arsenide. For three films with thicknesses of 102 nm, 250 nm, and 497 nm, elastic constants were calculated from least-squares fits of theoretical dispersion curves to phase velocity data at different film thickness-to-wavelength ratios. The measured film density decreased from 2800 to 2500 kg/m/sup 3/ with increasing film thickness. Within this density range the longitudinal elastic modulus averaged near 1.83*10/sup 11/ N/m/sup 2/ and the shear elastic modulus decreased from 0.918*10/sup 11/ N/m/sup 2/ to 0.561*10/sup 11/ N/m/sup 2/ as the film density decreased. The elastic moduli of thin-film silicon nitride are comparable to those of Si/sub 3/N/sub 4/ ceramics at similar densities.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"13 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":"124325490","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: 44
A new approach to one-dimensional piezoelectric transducer modelling 一维压电换能器建模的新方法
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171391
J. Dion
{"title":"A new approach to one-dimensional piezoelectric transducer modelling","authors":"J. Dion","doi":"10.1109/ULTSYM.1990.171391","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171391","url":null,"abstract":"It is shown that a piezoelectric element vibrating in an extensional or shear mode can be modeled rigorously in a novel way by systematic use of the transmission line analogy and the superposition theorem. A novel schematic representation of such an element that is somewhat more intuitive that other representations, particularly Mason's model, is introduced. The stresses on the electrode faces are considered as sources applied at the ends of an acoustic transmission line, since the acoustic perturbations may be considered as originating on these faces. Using transmission line theory, a complete set of expressions is found for electrical impedance, acoustic stresses, and velocities. Computed results are exactly the same as those given by the classical method, even if the computation sequence is almost entirely different.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"25 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":"124574943","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
Thresholds for tissue ablation by focused ultrasound 聚焦超声组织消融的阈值
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171649
J. Chapelon, J. Margonari, D. Cathignol, A. Gelet, C. Guers, Y. Theillère
{"title":"Thresholds for tissue ablation by focused ultrasound","authors":"J. Chapelon, J. Margonari, D. Cathignol, A. Gelet, C. Guers, Y. Theillère","doi":"10.1109/ULTSYM.1990.171649","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171649","url":null,"abstract":"Thresholds are reported for the production of in vivo focal ultrasonic tissue ablation, in rat kidneys, for single-shot irradiation at 1 MHz and 2.25 MHz with time durations ranging from 10 ms to 1 s. Several investigators have studied ultrasonic dosages for tissue damage, whereas here thresholds are given to produce total tissue ablation. It is shown that with short bursts, at the thresholds for tissue ablation, lesions as well as cavities surrounded by a small ring of coagulating necrosis which always appears at the focus of the sound wave are produced. However, when the intensity is increased, the lesions are more diffuse and do not necessarily appear at the focus, but at random positions. Sometimes for the highest intensities no lesion is present, suggesting that cavities form in the coupling medium.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"3 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":"114597797","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
Lamb wave excitation in piezoelectric plates 压电板的兰姆波激发
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171407
S. Joshi, Y. Jin
{"title":"Lamb wave excitation in piezoelectric plates","authors":"S. Joshi, Y. Jin","doi":"10.1109/ULTSYM.1990.171407","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171407","url":null,"abstract":"The excitation of ultrasonic Lamb waves by an interdigital transducer (IDT) deposited on a piezoelectric plate is analyzed using the Green's function method. The amplitudes of the generated waves are obtained in terms of the charge density on transducer electrodes. An electrostatic analysis that neglects piezoelectric coupling is used to relate this charge density to the voltage applied across the IDT. The analysis has been used to calculate the input conductance of an IDT as well as the coupling coefficient between the IDT and the various Lamb wave modes. It is found that when the plate is more than a few acoustic wavelengths thick the lowest order symmetric and antisymmetric Lamb modes are almost equally generated. The slight difference in the velocities of these modes gives rise to the beating effect whereby energy launched by the IDT on one surface transfers periodically back and forth between the two surfaces as a sinusoidal function of the distance traveled.<<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":"116269022","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
Electroacoustic characterisation of +64 degrees and +41 degrees Y-rotated LiNbO/sub 3/ for wide bandwidth low loss filter design 电声特性+64度和+41度y旋转LiNbO/sub 3/用于宽带低损耗滤波器设计
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171404
M. Doisy, J. Hode, J. Desbois, L. Boyer
{"title":"Electroacoustic characterisation of +64 degrees and +41 degrees Y-rotated LiNbO/sub 3/ for wide bandwidth low loss filter design","authors":"M. Doisy, J. Hode, J. Desbois, L. Boyer","doi":"10.1109/ULTSYM.1990.171404","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171404","url":null,"abstract":"Acoustic propagation on metallized surface high-coupling-coefficient 64 degrees and 41 degrees rotated Y-cut LiNbO/sub 3/ was investigated experimentally and theoretically. A complete set of experimentally determined acoustic parameters in the 0.85-tp-1.6-GHz frequency range is presented. 11.6% and 21% coupling constant values have been deduced from transducer admittance measurement for 64 degrees and 41 degrees LiNbO/sub 3/ respectively. These data have been applied to the design of 1-GHz image impedance connected low-loss filters. 7% and 10% 3-dB fractional bandwidth was obtained with 8- and 13-dB insertion loss on 64 degrees and 41 degrees LiNbO/sub 3/, respectively.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"27 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":"123977446","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
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