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IEEE 1988 Ultrasonics Symposium Proceedings.最新文献

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Microwave filters based on coupled MSW resonators and their applications 基于耦合生活垃圾谐振器的微波滤波器及其应用
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49376
S. Hanna
{"title":"Microwave filters based on coupled MSW resonators and their applications","authors":"S. Hanna","doi":"10.1109/ULTSYM.1988.49376","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49376","url":null,"abstract":"A novel and simple technique for realizing tunable and planar microwave bandpass filters has been investigated. The use of coupled magnetostatic wave (MSW) resonators for realizing these filters is demonstrated. Due to their low magnetic losses, epitaxially grown single-crystal yttrium iron garnet (YIG) films are used for the MSW propagation. The individual resonators are rectangular YIG films. The microwave signals are coupled to and from resonators using microstrip structures. The MSW resonators are magnetically coupled to realize multiple filters. Experimental results demonstrate the enhancement of the bandwidth and the improvement in the out-of-band rejection. Using two-coupled resonators the 3-dB bandwidth increased from 4-7 MHz (for single resonators) to more than 10 MHz. The out-of-band rejection was improved by 10 dB using the coupled resonators for realizing the filters. Since this technique is based on microstrip circuitry it can be easily integrated with other microwave integrated circuits in a system. The utilization of IC fabrication techniques ensures the potential for high degree of yield and reproducibility at reasonable cost. Applications for FW systems, such as tunable integrated channelizers, using the MSW coupled resonators are discussed.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132676115","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
A comparison of ultrasonic backscatter measured in vivo and in vitro 超声后向散射在体内和体外测量的比较
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49488
K. Shung, L. Pagan-Carlo
{"title":"A comparison of ultrasonic backscatter measured in vivo and in vitro","authors":"K. Shung, L. Pagan-Carlo","doi":"10.1109/ULTSYM.1988.49488","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49488","url":null,"abstract":"Since ultrasonic backscatter is intimately related to the echogenicity of a biological tissue in an ultrasonic image, it has been studied by many investigators in vitro. In the present study, an effort has been made to determine whether in vitro data can be extrapolated to in vivo situations. Ultrasonic backscatter collected from exposed organs in vivo on dogs was compared with that collected from tissues immediately following excision and up to 8 hours thereafter. It is shown that the in vivo and in vitro data do not differ significantly if the organs are properly prepared and stored.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"267 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133171730","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
Dependence of actively generated sound noise spectrum on flow-velocity 主动产生声噪声谱与流速的关系
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49507
S. Tanisawa, H. Hirose
{"title":"Dependence of actively generated sound noise spectrum on flow-velocity","authors":"S. Tanisawa, H. Hirose","doi":"10.1109/ULTSYM.1988.49507","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49507","url":null,"abstract":"Flow-velocity measurement in the case in which the intensity of ultrasound is known to be generated by vortex and turbulent flow in the fluid is considerably influenced by external electrical and sonic noises because the desired sound intensity is very weak. Therefore, some serious measurement problems exist with regard to the proportionality and linearity between the flow velocity and ultrasound pressure level, and the reproducibility of spectrum distribution for the same flow velocity. In this study the intensity of flow-induced sound was increased by artificially introducing air bubbles and attaching an obstacle across the pipe, resulting in linearity and reproducibility. Spectrum analyses suggest that the spectra-dependent sound intensity may be used for the measurement of flow velocity with linearity and reproducibility if filtering and band choice are appropriately realized.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133195524","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
Ultrasonic attenuation measurements of the flux lattice phase transition in the heavy fermion superconductor UPt/sub 3/ 重费米子超导体UPt/ sub3 /中磁通晶格相变的超声衰减测量
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49545
S. Adenwalla, Z. Zhao, J. Ketterson, D. Hinks, A. Schenstrom, Y. Hong, M. Xu, M. Levy, B. Sarma
{"title":"Ultrasonic attenuation measurements of the flux lattice phase transition in the heavy fermion superconductor UPt/sub 3/","authors":"S. Adenwalla, Z. Zhao, J. Ketterson, D. Hinks, A. Schenstrom, Y. Hong, M. Xu, M. Levy, B. Sarma","doi":"10.1109/ULTSYM.1988.49545","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49545","url":null,"abstract":"Attenuation measurements of longitudinal ultrasound in superconducting UPt/sub 3/ show a peak, below H/sub c2/, that depends strongly on the orientation of the field relative to the c-axis. This peak is seen only with longitudinal and not with transverse sound. It is show that, as the field is tipped away from the c axis into the basal plane. H/sub FL/ decreases from 1.3 T to 0.58 T (at the lowest temperature). The temperature dependence of H/sub FL/ for all orientations of the field is the same-a flat region, followed by a slow decrease in H/sub FL/ with increasing temperature.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133454116","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
A SAW filter bank using hyperbolically tapered transducers 使用双曲锥形换能器的SAW滤波器组
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49346
L. Solie, H.P. Fredricksen, S. Lins, C. Nelson
{"title":"A SAW filter bank using hyperbolically tapered transducers","authors":"L. Solie, H.P. Fredricksen, S. Lins, C. Nelson","doi":"10.1109/ULTSYM.1988.49346","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49346","url":null,"abstract":"It is shown that the hyperbolically tapered transducer is capable of launching a relatively narrow SAW (surface acoustic wave) beam from some point across a wide transducer aperture. The center of this narrow SAW beam varies linearly with frequency across the transducer. Thus, the transducer performs the spatial frequency sorting as it launches a wave. This makes it an ideal candidate for a filter bank or frequency-division multiplexer. A 14-channel multiplexer has been developed with a total bandwidth of 120 MHz centered at 180 MHz, (1 octave) out-of-band rejection of 40 dB and an insertion loss of 19 dB. Cascading filters demonstrates an out-of-band rejection of over 80 dB with an insertion loss around 30 dB.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133713173","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: 18
Ultrasonic speckle velocimetry 超声散斑测速
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49529
M. Nakajima, T. Itoh, M. ShingYouuchi, I. Akiyama, S. Yuta
{"title":"Ultrasonic speckle velocimetry","authors":"M. Nakajima, T. Itoh, M. ShingYouuchi, I. Akiyama, S. Yuta","doi":"10.1109/ULTSYM.1988.49529","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49529","url":null,"abstract":"The operating principle of an ultrasonic speckle velocimetry technique of flow-velocity measurement is described. This method allows the quick determination of the velocity of an object on the basis of a simple statistical process involving counting the local intensity fluctuations of the echo signal from the object. The results of a basic experiment to verify the effectiveness of the proposed method are presented. It is also shown that there is a linear relationship between the flow speed and the number of speckle intensity fluctuations.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131892702","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
Gigahertz ultrasound in single crystal superconducting YBa/sub 2/Cu/sub 3/O/sub 7/ 单晶超导YBa/sub 2/Cu/sub 3/O/sub 7/中的千兆赫超声
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49544
B. Golding, W. H. Haemmerle, L. Schneemeyer, J. Waszczak
{"title":"Gigahertz ultrasound in single crystal superconducting YBa/sub 2/Cu/sub 3/O/sub 7/","authors":"B. Golding, W. H. Haemmerle, L. Schneemeyer, J. Waszczak","doi":"10.1109/ULTSYM.1988.49544","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49544","url":null,"abstract":"Anisotropic sound propagation at 1 GHz in single-crystal YBa/sub 2/Cu/sub 3/O/sub 7/ is described. Longitudinal phonons have been studied from 0.01 K to 300 K, with emphasis on the temperature region near the superconducting transition T/sub c/ at 88 K. A discontinuous sound velocity is observed at T/sub c/ for propagation parallel and perpendicular to the c axis. Strain derivatives of T/sub c/ are evaluated using mean field theory. Below 1 K the temperature-dependent sound velocity has positive slope, which indicates tunneling of defects.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134487902","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
An ultrasonic circular array transducer for pipeline and borehole inspection 一种用于管道和井眼检测的超声圆阵换能器
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49459
H. Vos, R. Schepers, J. Vogel
{"title":"An ultrasonic circular array transducer for pipeline and borehole inspection","authors":"H. Vos, R. Schepers, J. Vogel","doi":"10.1109/ULTSYM.1988.49459","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49459","url":null,"abstract":"The circular array system was found to be a viable way to construct a rotating ultrasonic transducer without moving mechanical parts. Computer simulations were carried out to investigate the beam pattern related to this probe design. These indicated that subgroups should preferably consist of 8 to 16 elements. The beam pattern was found to be comparable to the beam pattern of a flat rectangular transducer when the phase shift related to probe curvature is compensated for by appropriate electronic delays on the respective elements within each subgroup. Furthermore, the viability of electronic focusing was demonstrated. A prototype probe consisting of 128 elements and operating at a frequency of 1 MHz was built. Measurements on multielement performance confirmed the results of computer simulations with regard to both beam rotation and focusing.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122909224","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
Nature of 1/f phase noise in quartz crystal resonators 石英晶体谐振器中1/f相位噪声的性质
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49402
Crystal Resonators, Michel Planat
{"title":"Nature of 1/f phase noise in quartz crystal resonators","authors":"Crystal Resonators, Michel Planat","doi":"10.1109/ULTSYM.1988.49402","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49402","url":null,"abstract":"It is shown that the universality and main characteristics of 1/f noise can be understood on the basis of a dispersive wave approach. However, it is noted that 1/f noise in quartz crystals seems to come from nonlinear dispersion. A clear correlation between 1/f noise level and phonon-phonon interactions between 4 K and 50 K has been observed for 10-MHz resonators. This confirms previous correlations observed at room temperature between the noise and the quality factor of bulk and surface wave resonators. A drastic increase of noise is also observed at very low temperature in connection with a glassy-like loss mechanism. On the theoretical side, the wave amplitude is shown to increase at very low frequencies due to the dispersive lattice, leading to nonlinearities. It is shown that the experimental findings can be understood with the help of a one-dimensional nonlinear wave model of the double-well potential type.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"129 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123183337","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
Heterojunction acoustic charge transport device technology 异质结声波电荷传输器件技术
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49357
D. Cullen, W. Tanski, S. W. Merritt, R. Sacks, R. D. Carroll, E. J. Branciforte
{"title":"Heterojunction acoustic charge transport device technology","authors":"D. Cullen, W. Tanski, S. W. Merritt, R. Sacks, R. D. Carroll, E. J. Branciforte","doi":"10.1109/ULTSYM.1988.49357","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49357","url":null,"abstract":"A brief description of the general acoustic charge transport (ACT) device and the operation of ACT devices is given. The application of GaAs-AlGaAs heterojunctions to ACT technology and the design of heterojunction ACT (HACT) devices is discussed. The performance characteristics of experimental HACT devices are presented. It is shown that Nyquist rate bandwidths with rolloffs less than 3dB can be obtained at signal output taps, and that transport currents of 100 mu A can be carried by the SAW with less than 4 mW/ lambda acoustic drive power. In addition, heterojunction FETs (field-effect transistors) with gain up to 10 GHz have been fabricated on HACT substrates, illustrating the compatibility of integrated circuitry with the HACT device substrate.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"246 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132349253","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
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