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Proceedings. IEEE Ultrasonics Symposium最新文献

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A 3.35 microsecond HACT transversal filter 一个3.35微秒的HACT横向滤波器
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66984
S. W. Merritt, W. Tanski, D. Cullen, R. Sacks, R. D. Carroll, E.J. Branciforte
{"title":"A 3.35 microsecond HACT transversal filter","authors":"S. W. Merritt, W. Tanski, D. Cullen, R. Sacks, R. D. Carroll, E.J. Branciforte","doi":"10.1109/ULTSYM.1989.66984","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.66984","url":null,"abstract":"A heterojunction acoustic charge transport (HACT) transversal filter with a 3.35- mu s integration time is reported. This is the longest acoustic charge transport device reported to date. The device operates at an acoustic clock frequency of 144 MHz and at an acoustic power of 100 mW. The output signal is generated by 480 equally weighted taps. The multiple output tap structure results in the device exhibiting 12 dB of gain when embedded in a 50- Omega system. Measurements of the 1-dB compression point, the third-order intercept, and the noise floor show the dynamic range of the device to be in excess of 80 dB over the 300-kHz bandwidth of the filter.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"91 1","pages":"213-216 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81753603","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
Myocardial tissue characterization: clinical confirmation of laboratory results 心肌组织特征:实验室结果的临床证实
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67146
J.G. Miller, B. Barzilai, M. Milunski, G. A. Mohr, J. Pérez, L. Thomas, K. Wear, S. Wickline, Z. Vered, B. Sobel
{"title":"Myocardial tissue characterization: clinical confirmation of laboratory results","authors":"J.G. Miller, B. Barzilai, M. Milunski, G. A. Mohr, J. Pérez, L. Thomas, K. Wear, S. Wickline, Z. Vered, B. Sobel","doi":"10.1109/ULTSYM.1989.67146","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67146","url":null,"abstract":"Tissue characterization previously identified ischemia, infarction, and cardiomyopathy in animal myocardium. Investigations to determine whether analogous results occur in patients were undertaken with a real-time two-dimensional backscatter imaging system. Remote infarction in 15 patients was accompanied by reduced magnitude and delayed cyclic variation. Similarly, ultrasonic evidence of diminished contractile function was found in five patients with dilated cardiomyopathy compared to 15 patients in a control group. Studies of 15 patients with acute myocardial infarction indicate that tissue characterization may permit the detection of reversibly injured or 'stunned' myocardium, despite the presence of severe wall-motion abnormalities that might otherwise mask the presence of viable but transiently dysfunctional tissue.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"101 1","pages":"1029-1036 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80824766","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
State of the art SAW resonators in France 法国最先进的SAW谐振器
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66980
L. Penavaire, S. Calisti, M. Solal, P. Dufilié
{"title":"State of the art SAW resonators in France","authors":"L. Penavaire, S. Calisti, M. Solal, P. Dufilié","doi":"10.1109/ULTSYM.1989.66980","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.66980","url":null,"abstract":"During the last three years Thomson has concentrated on producing reliable, low-noise, and high-stability SAW (surface acoustic wave) resonators. A complete resonator analysis was required, one which modeled effects such as transverse modes and intratransducer coupling. Research has yielded typically less than 1 p.p.m./yr aging and unloaded Q-factors higher than 18000 with resonators close to 500 MHz. The first oscillators realized at 320 MHz show a good phase noise spectrum. Standard production techniques coupled with a newly developed multichip all-quartz packaging technique were used in the resonator manufacture. In addition, with use of a finite element analysis, the mechanical structure of the resonator can now be optimized to minimize the accelerometric sensitivity, which is required in military environments. Details on the design, manufacture, and performance of resonators in the 300- and 500-MHz ranges are presented.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"5 1","pages":"185-190 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80694330","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
An improved model for chirped slanted SAW devices 啁啾倾斜SAW器件的改进模型
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66951
S. Jen, C. Hartmann
{"title":"An improved model for chirped slanted SAW devices","authors":"S. Jen, C. Hartmann","doi":"10.1109/ULTSYM.1989.66951","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.66951","url":null,"abstract":"Three improvements for modeling chirped slanted array compressor (SAC) transducer devices are presented. First, the generalized impulse response model for an in-line chirped IDT (interdigital transducer) is applied to individual longitudinal segments of a SAC transducer to obtain transversely distributed source profiles. The inherent simplicity of the coupling-of-mode formalism conveniently encompasses effects of both the chirped transduction and the transducer internal reflections. Second, these source profiles are the driving terms for an accurate propagation model, which calculates the total propagation loss between the transducers by successive applications of Snell's-law refraction and angular-spectrum diffraction, together with an experimentally characterized substrate attenuation. Third, in addition to the static capacitance and subsurface acoustic wave (SAW) conductance, the basic transducer equivalent circuit also includes the SAW susceptance, bulk radiation conductance and susceptance, and a revised parasitic resistive element. The SAW conductance is calculated by integrating the power in the source profiles. This in turn is used to calculate the SAW susceptance and the bulk conductance and susceptance. The combined model and its various elements have been verified by electrical and laser probe measurements. Good agreement with device data, amounting to better than 1 dB in device insertion loss and 0.3 dB in transducer mismatch loss, is reported.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"2010 1","pages":"7-14 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82545920","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
IIDT type SAW filter using acoustic reflection cancel condition with solid IDT IIDT型SAW滤波器采用声反射与固体IDT相抵消的条件
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66955
N. Mishima, M. Takase, S. Mitobe, Y. Ebata
{"title":"IIDT type SAW filter using acoustic reflection cancel condition with solid IDT","authors":"N. Mishima, M. Takase, S. Mitobe, Y. Ebata","doi":"10.1109/ULTSYM.1989.66955","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.66955","url":null,"abstract":"The performance of an IIDT (interdigitated interdigital transducer) filter using the acoustic-reflection cancel condition of the solid IDT is investigated for the substrate A1/128 degrees Y-X LiNbO/sub 3/. The acoustic reflection cancel condition is a combination of 2d/ lambda =0.5 and h/ lambda =0.026 in the solid fingers. Near this condition the solid finger width d and thickness h dependence of the acoustic reflection coefficient is calculated by the finite-element method. The solid-finger width needs to be carefully controlled during the etching process, to avoid filter response distortion caused by the acoustic reflection of the IDT and phase velocity difference between the IDT and the propagation area. A new IIDT-type SAW (surface acoustic wave) filter configuration with a reduced number of fingers is proposed. This filter has a low shape factor (the 1 dB-bandwidth to 6-dB bandwidth ratio is 1.1) and a small ripple pass band.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"16 1","pages":"31-35 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82563781","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
Tomographic imaging of material property variations in polymers 聚合物材料性质变化的层析成像
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67103
R. Kline, Y. Wang
{"title":"Tomographic imaging of material property variations in polymers","authors":"R. Kline, Y. Wang","doi":"10.1109/ULTSYM.1989.67103","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67103","url":null,"abstract":"The use of tomographic imaging to map out material property variations in polymeric media is explored. A set of target samples was prepared with known variations in cure state. Ultrasonic transit times for multiple ray paths were measured and, from these data, tomographic images were created using a modified algebraic reconstruction technique (ART) algorithm. These data were compared with simulated data in order to evaluate the spatial-resolution capability of the approach. Qualitative agreement between the actual sample image and that computed using the ART algorithm is good. However, image smoothing at the boundary between the core region and the sample exterior precludes a sharp transition. This effect tends to make it difficult to identify anomalies in material properties when the property difference is small (<3%).<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"32 1","pages":"827-830 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82749806","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
Acoustic microscopy with electronic scanning in one direction 在一个方向上进行电子扫描的声学显微镜
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67105
J. Cheeke, L. Germain
{"title":"Acoustic microscopy with electronic scanning in one direction","authors":"J. Cheeke, L. Germain","doi":"10.1109/ULTSYM.1989.67105","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67105","url":null,"abstract":"A method for electronic scanning in acoustic microscopy and ultrasonic imaging is described. A wedge transducer is used to illuminate a standard cylindrical lens. As the resonant frequency of the transducer varies with position, it is possible to sweep the focal spot down the line by changing the frequency. A typical acoustic image is given as well as detailed considerations on the resolution of the device. Experimental results on reflection from a scattering object indicate that the effective excitation width in the transducer is the main effect controlling the resolution.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"30 1","pages":"837-840 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90528061","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
Linear frequency tuning of SAW resonators SAW谐振器的线性频率调谐
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66981
M. Driscoll
{"title":"Linear frequency tuning of SAW resonators","authors":"M. Driscoll","doi":"10.1109/ULTSYM.1989.66981","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.66981","url":null,"abstract":"Linear, voltage-frequency tuning of SAW resonators with 500-p.p.m. tuning range using conventional, abrupt-junction varactor diodes is shown to be possible. The technique implemented uses varactor diode parallel inductance to provide a linear reactance vs. voltage network, which is effectively connected in series with the resonator motional impedance. Typical tuning ranges are significantly larger than those achievable using the phase-shifter approach, and are on the order of 300-500 p.p.m. for the 320-MHz resonator used. Experimental measurements indicate no resultant degradation in oscillator short-term frequency stability when a low flicker noise-sustaining stage is utilized. The achievable degree of tuning will allow nonovenized, phase-locked, and/or temperature-compensated oscillator operation over a wide temperature range. Low-distortion, oscillator-signal FM modulation is also possible.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"345 1","pages":"191-194 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89755749","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
Speckle reduction in two easy steps 斑点减少在两个简单的步骤
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67124
S. Leeman, J. Gatenby, F. Forsberg, J. Hoddinott
{"title":"Speckle reduction in two easy steps","authors":"S. Leeman, J. Gatenby, F. Forsberg, J. Hoddinott","doi":"10.1109/ULTSYM.1989.67124","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67124","url":null,"abstract":"A somewhat unorthodox technique for speckle reduction in medical ultrasound pulse-echo images is discussed. Two basic difficulties must be overcome. Recognition of the artifact is based upon an analysis of the instantaneous (temporal) frequency of the individual RF A-line. Correction of the speckle artifact at the local regions indicated by the recognition procedure is performed via techniques derived from the frequency-diversity approach. The hybrid temporal-Fourier processing algorithm has the merit of ultimate applicability on a real-time basis.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"40 1","pages":"927-930 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87789786","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
Electrical measurement of high frequency ceramic resonators 高频陶瓷谐振器的电测量
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67080
S. N. Wickstrom, T. R. Meeker
{"title":"Electrical measurement of high frequency ceramic resonators","authors":"S. N. Wickstrom, T. R. Meeker","doi":"10.1109/ULTSYM.1989.67080","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67080","url":null,"abstract":"A report is presented on the use of exact infinite-plate linear quasi-static piezoelectric elastic models to interpret electrical measurements on thickness-mode resonators made from PZT materials. These interpretations were used to determine the material constants of the piezoelectric ceramic. A need for completeness required the definition of electrical models of both the resonator and the measurement fixture. The electrical model of the measurement fixture included parasitic series inductances. During frequency measurements of large-area high-frequency resonators, the very low impedance level of the resonator and the fixture parasitics combine to produce resonance-frequency shifts. Algebraic derivation and computer-simulation results show how these resonance-frequency shifts depend on the sample material's properties and geometry and on the fixture parasitic elements. This resulted in development of a proper model; piezoelectric coupling was determined in the presence of series induction with the model and the measurement of two resonance frequencies.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"137 1","pages":"717-722 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89133728","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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