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Proceedings. IEEE Ultrasonics Symposium最新文献

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An experimental analysis of a sector-vortex phased array prototype 扇形涡相控阵样机的实验分析
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67139
F. Ngo, E. Ebbini, C. Cain
{"title":"An experimental analysis of a sector-vortex phased array prototype","authors":"F. Ngo, E. Ebbini, C. Cain","doi":"10.1109/ULTSYM.1989.67139","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67139","url":null,"abstract":"This study involved the characterization of the individual elements in a prototype hyperthermia applicator based on the sector-vortex phased array. The results showed substantial variations in the amplitudes and phases of the pressure outputs of elements driven with the same input signal. However, these variations produced only a slight asymmetry in the side lobes and did not affect the 3-dB beamwidth of the characteristic focus. Compensating for the phase variations increased the focal intensity and improved the symmetry of the overall field pattern. Similar improvement was found when compensation was used for the synthesis of an annular field pattern. The fact that this compensation could be completely implemented in software demonstrates the flexibility of phased arrays.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"16 1","pages":"999-1002 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89494879","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
Angular spectrum of waves analysis of SAW filters with dispersive transducers 带色散换能器的SAW滤波器的角波谱分析
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66967
G. Visintini, C. Ruppel, R. Greening
{"title":"Angular spectrum of waves analysis of SAW filters with dispersive transducers","authors":"G. Visintini, C. Ruppel, R. Greening","doi":"10.1109/ULTSYM.1989.66967","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.66967","url":null,"abstract":"The extended annular-spectrum-of-waves (ASoW) model is applied to the simulation of SAW (surface acoustic wave) devices with dispersive transducers. Both inline and slanted interdigital transducer (IDT) geometries are analyzed. Two extensions of the existing model are presented. The wave propagation between two slanted IDTs is modeled in the ASoW with a three-prism model considering exactly the quadrupole refraction effect at the bus bars between the input and the output IDT. Different velocity dispersions in the bus bars and in the transducers, due to both the electrical loading and the mechanical loading effects, are taken into account. The measurements of two delay lines are compared with the corresponding simulations. Excellent agreement, even at the band edges, is shown. Simulations demonstrate the strong effect of refraction at the bus bars.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"21 1","pages":"107-112 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72762970","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: 12
Chirp excitation of ultrasonic probe for high-rangeability gas flowmetering 高量程气体流量测量用超声探头的啁啾激励
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67157
T. Folkestad, K. Mylvaganam, S.L. Bersaas, B. Ullebust
{"title":"Chirp excitation of ultrasonic probe for high-rangeability gas flowmetering","authors":"T. Folkestad, K. Mylvaganam, S.L. Bersaas, B. Ullebust","doi":"10.1109/ULTSYM.1989.67157","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67157","url":null,"abstract":"The adaptive signal processing based on pulse compression in conjunction with the ray rescue-angle orientation of the transducers is another important feature for achieving high-rangeability ultrasonic gas flowmetering. A technique for achieving the necessary broad bandwidth of the ultrasonic transducer, which has to be excited within a low-frequency band due to the increased absorption of ultrasound in gas with frequency, is described. A signal-processing system suitable for very low and high times-of-flight and their differences is also presented. Discussed is the use of a special filtering technique based on assessing the gradient of the time series (in ascending order) of times-of-flight which eliminates spurious times-of-flight observed in actual interrogations of the flow.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"17 1","pages":"1087-1092 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74709683","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
Biological effects of extracorporeal shock waves 体外冲击波的生物效应
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67136
M. Delius
{"title":"Biological effects of extracorporeal shock waves","authors":"M. Delius","doi":"10.1109/ULTSYM.1989.67136","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67136","url":null,"abstract":"Extracorporeal shock waves are used in medicine to destroy kidney stones and gallstones. In the body, they can affect tissues. These effects have been examined in many organs and generally consist of hemorrhages, destruction of venous walls, and venous thrombi. Tissue effects and stone destruction were considered to be due to a direct shock-wave effect or to cavitation; some experiments are presented which point to the involvement of cavitation as a mechanism of both tissue damage and stone destruction. A model of shock-wave action that could explain the observed effects is proposed.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"94 1","pages":"983-990 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74720403","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
An unusual problem in vibration damping: the flat tension mask computer tube 振动阻尼中的一个不寻常的问题:平板张力掩模计算机管
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67158
R. Adler, P.J. Desmares
{"title":"An unusual problem in vibration damping: the flat tension mask computer tube","authors":"R. Adler, P.J. Desmares","doi":"10.1109/ULTSYM.1989.67158","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67158","url":null,"abstract":"In the flat tension-mask tube recently introduced, the mask is a flat steel membrane only 1 mil (25 mu m) thick, stretched close to its elastic limit. With no air damping, flexural vibrations of this membrane decay slowly and may become noticeable in vehicular applications. Damping such tension-mask vibrations is rendered difficult by three factors: the mask must be kept clear of obstructions, except for a narrow strip along its edges; mask resonance frequencies vary widely during operation, because electron-beam heating of the mask changes with picture content, causing tension to vary correspondingly; and conventional damping materials cannot be used in a vacuum tube. The first two obstacles are overcome by a dynamic vibration damper attached to the mask near its edge in such a way that the resonant frequency of the damper tracks that of the mask. Resistive loading of this damper over a wide frequency range is provided by a flexural transmission line loaded with loose-fitting bushings. The decay time of the fundamental membrane mode is thus reduced from about 10 s to approximately 20 ms.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"14 1","pages":"1093-1097 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79016897","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
Measurement and dynamic display of acoustic wave pulses 声波脉冲的测量与动态显示
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67070
J. Lu, T. Kinter, J. Greenleaf
{"title":"Measurement and dynamic display of acoustic wave pulses","authors":"J. Lu, T. Kinter, J. Greenleaf","doi":"10.1109/ULTSYM.1989.67070","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67070","url":null,"abstract":"To evaluate and improve the longitudinal and lateral resolution of an ultrasonic transducer in pulse-echo imaging, it is useful to visualize how the ultrasonic pulse travels in space. A method for measuring and dynamically displaying the traveling acoustic wave pulses is developed. A half-millimeter hydrophone was used to scan two-dimensional planes through the beams produced by three types of transducers: commercial PZT, air-backed PZT, and PZT ceramic/polymer composite. The signals were digitized and stored in two- and three-dimensional formats. The ANALYZE software package was used to produce movies of the traveling wave as well as the two- and three-dimensional depictions of the pulse at various points in space and time.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"102 1","pages":"673-676 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75903941","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
Piezoelectric ultrasonic motor using longitudinal-torsional composite vibration of a cylindrical resonator 压电超声电机采用纵扭复合振动的圆柱形谐振器
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67085
O. Ohnishi, O. Myohga, T. Uchikawa, M. Tamegai, T. Inoue, S. Takahashi
{"title":"Piezoelectric ultrasonic motor using longitudinal-torsional composite vibration of a cylindrical resonator","authors":"O. Ohnishi, O. Myohga, T. Uchikawa, M. Tamegai, T. Inoue, S. Takahashi","doi":"10.1109/ULTSYM.1989.67085","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67085","url":null,"abstract":"A piezoelectric ultrasonic motor, which uses longitudinal and torsional composite vibration of a cylindrical resonator, was investigated. It was found that the resonant frequencies for longitudinal mode and torsional mode could coincide with each other in the cylindrical resonator, according to finite element analysis and experimental measurement. The motor using both resonant vibrations showed good performance. The 20-mm-diameter motor exhibited a 4 kgf-cm maximum torque, a 450-r.p.m maximum rotational speed, and a 40% maximum efficiency.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"79 5 1","pages":"739-743 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77832129","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: 16
Anomalies in the dispersion of guided waves in a fluid-loaded periodic corrugated plate 载液周期波纹板中导波色散的异常现象
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67188
X. Jia, A. Jungman, G. Quentin
{"title":"Anomalies in the dispersion of guided waves in a fluid-loaded periodic corrugated plate","authors":"X. Jia, A. Jungman, G. Quentin","doi":"10.1109/ULTSYM.1989.67188","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67188","url":null,"abstract":"Results of experimental measurements of ultrasonic leaky Lamb waves and Scholte-Stoneley waves in an immersed plate with a periodic profile are presented. Plate modes and surface modes are generated on a thin fluid-coupled plate due to diffraction and mode conversion on the periodic grooves engraved on the metallic sample. A significant advantage of such a method is its ability to excite guided waves that have a phase velocity lower than the velocity of the fluid. Sharp dips observed in the reflected spectrum at certain frequency positions are related to the existence of Lamb and Scholte-Stoneley modes. Special emphasize is given to the low frequency domain. Experimental data show anomalous ultrasonic dispersion in this region and a mixing between the A/sub 0/ mode and the Scholte-Stoneley mode.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"25 1","pages":"1245-1248 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77886233","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
Ultrasonic surface waves and Lamb waves in fluid saturated porous solids 流体饱和多孔固体中的超声表面波和兰姆波
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67182
L. Adler, P. Nagy, Q. Xue
{"title":"Ultrasonic surface waves and Lamb waves in fluid saturated porous solids","authors":"L. Adler, P. Nagy, Q. Xue","doi":"10.1109/ULTSYM.1989.67182","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67182","url":null,"abstract":"The interactions of ultrasonic waves with a fluid/fluid-saturated porous solid interface and a fluid-saturated porous solid plate in a vacuum and in fluid have been studied. In the first case surface modes are generated and detected by using a periodically corrugated surface structure of a fluid-saturated porous solid; in the second case, the behavior of Lamb waves has been investigated theoretically and experimentally. Dispersion curves of Lamb modes in a fluid-saturated porous plate with sealed pores and free boundary are computed to illustrate the role played by the second longitudinal (or slow) wave and its influence on the Lamb-wave spectrum. As a result of the study, applications have been found using the surface-wave techniques and the Lamb-wave technique to evaluate fluid-saturated porous media and to detect the slow longitudinal wave.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"37 1","pages":"1215-1219 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77250085","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
Modelling temperature distributions produced by ultrasound phased arrays for hyperthermia 热疗超声相控阵产生的温度分布模型
Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67127
R. Lalonde, A. Worthington, J. Hunt
{"title":"Modelling temperature distributions produced by ultrasound phased arrays for hyperthermia","authors":"R. Lalonde, A. Worthington, J. Hunt","doi":"10.1109/ULTSYM.1989.67127","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67127","url":null,"abstract":"A computer modeling study was undertaken to determine the temperature distributions that could be created in tissue by ultrasound phased arrays for hyperthermia. The field-conjugation method was used to synthesize a focus directly. Temperature inside a modeled tissue phantom was determined to two different treatment protocols. Rapid, high-temperature treatments showed better thermal-dose distributions produced in tissue compared to slower treatment protocols. The possible effect of phase error during propagation through tissue was modeled in a simple manner by adding random phases to the array elements. The addition of phase error produced only slight changes to the intensity and temperature profiles.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"74 1","pages":"941-944 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80742156","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
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