发布求助
文献互助 智能选刊 最新文献

Proceedings. IEEE Ultrasonics Symposium最新文献

筛选
英文 中文
A 2.5 GHz low noise phase locked surface transverse wave VCO 一种2.5 GHz低噪声锁相表面横波压控振荡器
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66960
B. Fleischmann, A. Roth, P. Russer, R. Weigel
{"title":"A 2.5 GHz low noise phase locked surface transverse wave VCO","authors":"B. Fleischmann, A. Roth, P. Russer, R. Weigel","doi":"10.1109/ULTSYM.1989.66960","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.66960","url":null,"abstract":"A hybrid VCO (voltage-controlled oscillator) at 2.488 GHz which is phase locked to a crystal oscillator operating at 75.4 MHz is described. Acoustic surface transverse wave (STW) delay lines operating at the fifth harmonic are used as the frequency-controlling element of the VCO. In order to reduce the delay-line electromagnetic feedthrough a three-transducer-type STW filter design is combined with a microstrip rat-race coupler. The filters were designed using advanced analysis methods and fabricated on rotated Y-cut quartz substrates with a standard photolithographic process. The delay lines were characterized by a center frequency of 2.49 GHz, an untuned insertion loss of 22 dB, an unloaded Q value of 1280, and a group delay time of 158 ns. The signal of the VCO is mixed with the local (crystal) oscillator signal multiplied by 32, thus providing an IF (intermediate frequency) signal of 75.4 MHz that feeds the phase-locked loop, which has a bandwidth of 300 kHz. A single-sideband phase-noise-to-carrier ratio of -112 dBc/Hz at 1-kHz offset has been attained.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"46 1","pages":"65-69 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73919391","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
Visualization of transient behaviour of piezoelectric ceramics by means of finite elements method 压电陶瓷瞬态特性的有限元可视化
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67106
P. Lanceleur, S. Fadili, J. de Belleval, N. Mercier
{"title":"Visualization of transient behaviour of piezoelectric ceramics by means of finite elements method","authors":"P. Lanceleur, S. Fadili, J. de Belleval, N. Mercier","doi":"10.1109/ULTSYM.1989.67106","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67106","url":null,"abstract":"A method based on a finite-element analysis that permits the calculation and the visualization of deformations of ultrasonic transducers in different configurations is presented. The method uses a Fourier-series synthesis giving deformation of the free surface and electrical admittance for wide frequency bands by the use of finite element procedures previously developed. These methods were originally developed in the monochromatic case: one of the difficulties of this work was the adaptation and the validation of the methods in the multifrequency excitation cases, more realistic in the area of nondestructive examination (NDE) using ultrasonic methods. Several geometries were then tested, and an experimental confirmation of the results was achieved.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"96 1","pages":"841-844 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73583561","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
Simulation of bulk wave effects in SAW devices using Green's function and angular spectrum of waves 用格林函数和波的角谱模拟SAW器件中的体波效应
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66966
K. Wagner, G. Visintini
{"title":"Simulation of bulk wave effects in SAW devices using Green's function and angular spectrum of waves","authors":"K. Wagner, G. Visintini","doi":"10.1109/ULTSYM.1989.66966","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.66966","url":null,"abstract":"It is shown that the angular-spectrum-of-waves formalism can be used for the calculation of spurious bulk-wave transmissions in SAW (surface acoustic wave) devices. For each SAW-propagation direction, the bulk-wave contribution to the Green's function is approximated by a sum of several decaying sinusoidal waves. Applying a least-squares fitting procedure, the a priori unknown amplitudes, phases, and decay constants are determined. These data are used as input for an analysis program based on the extended angular-spectrum-of-waves formalism. Advantages of this approach are correct consideration of angle-dependent coupling and bulk-wave diffraction, compatibility to SAW-device analysis based on angular-spectrum methods, and moderate CPU-time requirements.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"4 1","pages":"103-106 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74346048","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
Estimation of blood velocity using the wideband maximum likelihood estimator (ultrasonic measurement) 利用宽带最大似然估计器估计血流速度(超声测量)
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67118
K. Ferrara, V. Algazi
{"title":"Estimation of blood velocity using the wideband maximum likelihood estimator (ultrasonic measurement)","authors":"K. Ferrara, V. Algazi","doi":"10.1109/ULTSYM.1989.67118","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67118","url":null,"abstract":"The local accuracy of the wideband point MLE (maximum likelihood estimator) is evaluated through the use of the Cramer-Rao bound. This evaluation shows that this new estimation strategy results in a reduced bound on the estimator variance in comparison with traditional strategies. In order to study global accuracy the expected estimator output is evaluated and the width of the mainlobe and the height of subsidiary peaks are reduced through the use of this estimator. In an experimental study, the predictions are compared with actual values computed from ultrasonic data. Through this investigation, the assumptions of the model are verified and the predicted improvements in local and global accuracy are confirmed.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"1 1","pages":"897-901 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78621109","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
Enhancement of adriamycin cytotoxicity by therapeutic ultrasound in vivo 体内超声治疗增强阿霉素的细胞毒性
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67131
A. H. Saad, G. Hahn
{"title":"Enhancement of adriamycin cytotoxicity by therapeutic ultrasound in vivo","authors":"A. H. Saad, G. Hahn","doi":"10.1109/ULTSYM.1989.67131","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67131","url":null,"abstract":"A report is presented on the enhancing effect of ultrasound upon adriamycin (Adr) antitumor action in vivo. RIF-1 tumors were insonated (F=1.733 MHz) 10 min after the intravenous injection of Adr (10 and 20 mu g/g). This resulted in an increase in the tumor doubling time and a decrease in the TCD/sub 50/ when compared to ultrasound treatment alone or to the combination of water-bath heating of the tumor and Adr. The enhancement was dependent upon the dose of Adr injected, the intensity of sonication, and the temperature of the tumor. The results suggest that nonthermal mechanisms of ultrasound action are responsible for potentiation of Adr toxicity. The lack of ultrasound enhancement of daunomycin cytotoxicity in vitro is discussed.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"87 1","pages":"961-964 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79880267","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
Coaxial thin film transducers based on PZT 基于压电陶瓷的同轴薄膜换能器
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67185
G. Yi, M. Sayer, C. Jen, J. Yu, E. Adler
{"title":"Coaxial thin film transducers based on PZT","authors":"G. Yi, M. Sayer, C. Jen, J. Yu, E. Adler","doi":"10.1109/ULTSYM.1989.67185","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67185","url":null,"abstract":"The results of the piezoelectric and acoustic experiments on thin films of lead zirconate titanate (PZT) coated coaxially on optical fibers with a gold or an aluminum thin jacket are presented. The PZT films are fabricated by sol-gel processing using dip coating. Coating lengths of 10-cm and film thicknesses up to 6 mu m have been achieved. The piezoelectricity is induced by electric poling. Potential applications in medical and inline fiber optical acousto-optic devices are discussed.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"39 1","pages":"1231-1235 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84191679","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
Practical implementation of coupling-of-modes theory for SAW device modeling SAW器件建模模式耦合理论的实际实现
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66975
R. Brown, B. Horine, J. Hines
{"title":"Practical implementation of coupling-of-modes theory for SAW device modeling","authors":"R. Brown, B. Horine, J. Hines","doi":"10.1109/ULTSYM.1989.66975","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.66975","url":null,"abstract":"Procedures are presented for integrating the COM (coupling-of-modes) results of C.S. Hartmann and B.P. Abbott (1988) into a form useful for modeling an entire SAW (surface acoustic wave) device. Conversion of the three-port P-matrix COM solutions into a standard two-port ABCD matrix form is shown. With the resultant ABCD matrix, graphical results are shown for the full SAW device model including second-order effects and matching circuitry. These results are presented for different types of SAW devices such as those with uniform, apodized, and withdrawal-weighted transducers and are compared with conventional approaches to SAW modeling. Experimental results for various device configurations and metal thicknesses are shown for comparison with predicted model results. In general there is close agreement between experiment and the implementation of COM theory reviewed.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"167 1","pages":"153-158 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84995353","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: 15
Contrast ultrasonic blood flowmetry 对比超声血流法
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67120
K. Shung, H. Bleeker
{"title":"Contrast ultrasonic blood flowmetry","authors":"K. Shung, H. Bleeker","doi":"10.1109/ULTSYM.1989.67120","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67120","url":null,"abstract":"In recent years, a number of contrast media have been developed for contrast echocardiography. The most notable are SHU 454 and Albunex. These agents are potentially useful for quantifying myocardial perfusion. However, the fact that these agents can also be utilized for quantitative blood flow has never been investigated. Initial results obtained on various approaches to exploring the feasibility of using Albunex for measuring average and instantaneous blood flow are presented and discussed. These results indicate that contrast ultrasonic blood flowmetry is a viable approach.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"24 1","pages":"907-910 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83994716","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
Analysis and compensation of metal resistivity effects in apodized SAW transducers apozed SAW换能器中金属电阻率效应的分析与补偿
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66950
O. Manner, G. Visinitini
{"title":"Analysis and compensation of metal resistivity effects in apodized SAW transducers","authors":"O. Manner, G. Visinitini","doi":"10.1109/ULTSYM.1989.66950","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.66950","url":null,"abstract":"A method for the modeling of electrode resistance effects within apodized SAW (surface acoustic wave) transducers is presented The transducer is treated as a two-dimensional distributed network and analyzed by the standard methods of network theory. Electrostatic and acoustic interactions are fully taken into account. A full-scale numerical analysis based on a track division approach and an iterative solution of the network equations is presented. The computing time has been reduced to an acceptable level by using a quasi-equidistant track division scheme. The calculated deviation of the transfer function due to the resistivity of the metal is used to correct the result of the diffraction simulation. Metal resistivity and diffraction effects were compensated simultaneously in an in-line filter with a 40% relative bandwidth. The passband and stopband characteristics can be improved over those of an identical design compensated for diffraction only.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"8 1","pages":"1-6 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78529103","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
SAW device impulse response modeling using broadband diffraction theory 基于宽带衍射理论的声呐器件脉冲响应建模
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66954
J. Hines, D. Malocha, R. Brown
{"title":"SAW device impulse response modeling using broadband diffraction theory","authors":"J. Hines, D. Malocha, R. Brown","doi":"10.1109/ULTSYM.1989.66954","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.66954","url":null,"abstract":"An approach to obtaining a two-dimensional impulse-response diffraction model valid for the broadband case has been developed by J.H. Hines (1988). This approach utilizes a double integral reduction technique to determine the tap to tap response, and has been used to analyze various tap configurations on both isotropic and anisotropic substrates. In the present work, the authors give an extension of this analysis technique to model the effects of diffraction on the impulse response of a complete SAW (surface acoustic wave) device. Both isotropic and anisotropic substrates are treated. Also considered are the implications of the two-dimensional nature of the mathematical formulation of the model, and how the results of this formulation influence the validity of the model. Comparison is made between theoretical and experimentally observed device performance. The potential exists for this analysis technique to be applied to broadband diffraction compensation.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"161 1","pages":"25-29 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76626641","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信
小红书