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1994 Proceedings of IEEE Ultrasonics Symposium最新文献

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Verification of a Kirchhoff scattering model for imaging pits on a water/steel interface with a focused transducer 用聚焦传感器对水/钢界面凹坑成像的Kirchhoff散射模型的验证
1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401718
M. Prange, K. Liang
{"title":"Verification of a Kirchhoff scattering model for imaging pits on a water/steel interface with a focused transducer","authors":"M. Prange, K. Liang","doi":"10.1109/ULTSYM.1994.401718","DOIUrl":"https://doi.org/10.1109/ULTSYM.1994.401718","url":null,"abstract":"Ultrasonic simulators based on the Kirchhoff approximation, a single-scattering approximation, allow imaging geometries with three-dimensional irregular surfaces. Cracked or pitted surfaces can be simulated orders of magnitude faster than alternative general surface simulators such as those based on the finite difference method. Numerical and laboratory tests of the accuracy of the Kirchhoff approximation for simulating ultrasonic scattering from small pits in a steel plate show that the approximation is accurate for geometries where specular or diffracted waves are dominant. For small pits, where strong multiple scattering is present, the simulator still accurately describes the early time behavior of the received voltage waveforms","PeriodicalId":394363,"journal":{"name":"1994 Proceedings of IEEE Ultrasonics Symposium","volume":"653 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115111233","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
Nonlinear acoustical response of coated microbubbles in diagnostic ultrasound 超声诊断中包覆微泡的非线性声响应
1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401889
V. Uhlendorf, C. Hoffmann
{"title":"Nonlinear acoustical response of coated microbubbles in diagnostic ultrasound","authors":"V. Uhlendorf, C. Hoffmann","doi":"10.1109/ULTSYM.1994.401889","DOIUrl":"https://doi.org/10.1109/ULTSYM.1994.401889","url":null,"abstract":"Microbubbles coated with a thin biodegradable polymer shell are used in SHU 563 A, a new kind of ultrasound contrast medium. These particles are durable linear scatterers for prolonged times at low acoustic pressure amplitudes. They will immediately rupture at higher amplitudes within the range of diagnostic ultrasound causing a transient nonlinear response termed “Acoustically Stimulated Acoustic Emission”. Characteristics of this effect and some potential applications in novel and extraordinary sensitive conventional and Harmonic Imaging modes are discussed","PeriodicalId":394363,"journal":{"name":"1994 Proceedings of IEEE Ultrasonics Symposium","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115448748","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: 93
Flaw detection in stainless steel samples using wavelet decomposition 基于小波分解的不锈钢试样缺陷检测
1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401815
K. Kaya, N. Bilgutay, R. Murthy
{"title":"Flaw detection in stainless steel samples using wavelet decomposition","authors":"K. Kaya, N. Bilgutay, R. Murthy","doi":"10.1109/ULTSYM.1994.401815","DOIUrl":"https://doi.org/10.1109/ULTSYM.1994.401815","url":null,"abstract":"Wavelet techniques have emerged as useful tools in signal analysis because of their time-frequency localization properties. In this work, wavelet decomposition and reconstruction algorithms are used in ultrasonic nondestructive testing applications to distinguish between the flaw echo and background grain noise. The discrete wavelet transform is applied to reconstruct the signal at scales likely to contain the target. Nonlinear algorithms are used to obtain the output signal from the reconstructed signals. Preliminary results indicate that these methods are quite successful in the detection of single targets but not as effective as split spectrum processing in the resolution of closely spaced multiple targets","PeriodicalId":394363,"journal":{"name":"1994 Proceedings of IEEE Ultrasonics Symposium","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115465142","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: 31
Measurement of ultrasonic parameters for high Tc oxide superconductors: evidence of non-pure modes excitation 高Tc氧化物超导体的超声参数测量:非纯模式激发的证据
1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401767
E. Biagi, L. Masi
{"title":"Measurement of ultrasonic parameters for high Tc oxide superconductors: evidence of non-pure modes excitation","authors":"E. Biagi, L. Masi","doi":"10.1109/ULTSYM.1994.401767","DOIUrl":"https://doi.org/10.1109/ULTSYM.1994.401767","url":null,"abstract":"Ultrasonic pulse propagation in polycrystalline YBa2Cu 3O6+x samples was examined during thermo-cycling from room temperature to well below the critical temperature Tc . Ultrasonic velocity and attenuation were measured with high accuracy using a particular reference signal. An appropriate evaluation of these ultrasonic parameters is strictly correlated to the knowledge of the propagation modes of the ultrasonic waves which are induced in the material. If the ultrasonic propagation direction is not perfectly aligned with the sample symmetry axis, non-pure propagation modes can be excited, and in this case quasi-longitudinal and quasi-shear modes are obtained. These non-pure modes are characterized by different velocity and attenuation values. For this purpose the signal analysis in the frequency domain was demonstrated to be a powerful tool to identify the existence of these non-pure modes. In light of these results, a clearer analysis of velocity and attenuation versus temperature behavior is possible","PeriodicalId":394363,"journal":{"name":"1994 Proceedings of IEEE Ultrasonics Symposium","volume":"547 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123069773","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
Precise design technique of SAW transversely coupled resonator filters on quartz 石英上SAW横向耦合谐振器滤波器的精确设计技术
1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401553
D. Chen, M. Schwab, C. Lambert, C. Hartmann, J. Heighway
{"title":"Precise design technique of SAW transversely coupled resonator filters on quartz","authors":"D. Chen, M. Schwab, C. Lambert, C. Hartmann, J. Heighway","doi":"10.1109/ULTSYM.1994.401553","DOIUrl":"https://doi.org/10.1109/ULTSYM.1994.401553","url":null,"abstract":"The design of transversely coupled SAW resonator filters is more complex than conventional SAW's because of its two dimensional nature. Previously, an innovative COM modeling technique for TCF's was proposed along with the method of experimentally determining the COM and electrostatic parameters necessary for the model. In this paper detailed design examples are given which are based on this modeling technique and the parameter database. The paper gives all design information (number of electrodes, beam width, grating and transducer periods, etc.) and corresponding COM model parameters. Also, the complete measured and predicted electric performances are presented. An excellent agreement is found between the theoretical predictions and the experiments over a wide frequency range. As a practical design tool this approach has shown an excellent accuracy and high efficiency for optimum design procedures","PeriodicalId":394363,"journal":{"name":"1994 Proceedings of IEEE Ultrasonics Symposium","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121393954","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
A comparison of IIR initialization techniques for improved color Doppler wall filter performance 改进彩色多普勒壁滤波器性能的IIR初始化技术的比较
1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401919
R. Peterson, L. Atlas, K. Beach
{"title":"A comparison of IIR initialization techniques for improved color Doppler wall filter performance","authors":"R. Peterson, L. Atlas, K. Beach","doi":"10.1109/ULTSYM.1994.401919","DOIUrl":"https://doi.org/10.1109/ULTSYM.1994.401919","url":null,"abstract":"The performance of exponential initialization, a novel infinite impulse response (IIR) filter initialization technique, was compared with that of three existing initialization techniques, zero, step, and projection in the context of color Doppler wall filtering. A simulation which uses a statistical estimation approach, was developed to evaluate the performance of each of the initialized IIR filters in terms of their effect on frequency estimation and tissue echo suppression. The results show that the wall filters examined here introduce a degree of bias into Doppler frequency estimation which depends on the IIR initialization technique, the filter cutoff frequency, the number of Doppler samples in the sample volume, and the input signal statistics. In addition, the realized frequency response is compromised relative to the desired steady state IIR response. Exponential initialization is shown to exhibit the least frequency estimate bias","PeriodicalId":394363,"journal":{"name":"1994 Proceedings of IEEE Ultrasonics Symposium","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125351186","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: 36
The theory of the SAW transversely coupled waveguide resonator filter 声表面波横向耦合波导谐振器滤波器的原理
1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401558
S. Biryukov, G. Martin, V. G. Polevoi, M. Weihnacht
{"title":"The theory of the SAW transversely coupled waveguide resonator filter","authors":"S. Biryukov, G. Martin, V. G. Polevoi, M. Weihnacht","doi":"10.1109/ULTSYM.1994.401558","DOIUrl":"https://doi.org/10.1109/ULTSYM.1994.401558","url":null,"abstract":"The known theory of coupling-of-modes (COM) equations for description of two-dimensional structures is generalized consistently to the three-dimensional structure of transversely coupled waveguide resonator filter (TCF). The COM equations for slowly varying amplitudes of SAW electric potential as function of longitudinal coordinate are derived taking into account all the possible modes. The theory connects the material and geometrical parameters of the structure with the characteristics of TCF. The frequency dependence of admittance matrix and insertion loss for one and two cascaded filters are considered. The splitting of the resonance peaks due to cascading is investigated. A good coincidence between theoretical and experimental results is found","PeriodicalId":394363,"journal":{"name":"1994 Proceedings of IEEE Ultrasonics Symposium","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125362660","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
Electro-optic and acousto-optic modulators using Stark effect in multiple quantum well structures 多量子阱结构中使用Stark效应的电光和声光调制器
1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401685
F. Jain, S. Cheung, W. Huang, A. Demaria, R. Sacks, D. Cullen, T. Grudkowski, C. Valerio, K. Bhattachajee
{"title":"Electro-optic and acousto-optic modulators using Stark effect in multiple quantum well structures","authors":"F. Jain, S. Cheung, W. Huang, A. Demaria, R. Sacks, D. Cullen, T. Grudkowski, C. Valerio, K. Bhattachajee","doi":"10.1109/ULTSYM.1994.401685","DOIUrl":"https://doi.org/10.1109/ULTSYM.1994.401685","url":null,"abstract":"Enhanced changes in absorption, index of refraction and birefringence have been observed in InGaAs-GaAs multiple quantum well structures operating in the 980-1000 nm range. The changes in optical parameters are used to develop electro-optic as well as acousto-optic modulators. Preliminary work on heterostructure acoustic charge transport (HACT) to address an array of high contrast pixels is presented. HACT addressing is shown to result in about 3×n interconnects in place of n×n needed in conventional row/column select techniques. This is relevant to the implementation of compact, high-contrast spatial light modulators at clock rates approaching 1 GHz for optical computing and image processing applications. Results on modulators using surface acoustic wave (SAW) induced Stark effect, and switching and modulation in novel structures consisting of electro-optic Bragg gratings (induced by quadratic index changes due to Stark effect) are reported","PeriodicalId":394363,"journal":{"name":"1994 Proceedings of IEEE Ultrasonics Symposium","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125367178","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
Analytical microsystem for organic gas detection based on SAW devices 基于SAW器件的有机气体检测分析微系统
1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401663
M. Rapp, H. Gemmeke, J. Reichert, A. Voigt
{"title":"Analytical microsystem for organic gas detection based on SAW devices","authors":"M. Rapp, H. Gemmeke, J. Reichert, A. Voigt","doi":"10.1109/ULTSYM.1994.401663","DOIUrl":"https://doi.org/10.1109/ULTSYM.1994.401663","url":null,"abstract":"Modified SAW devices can be used as highly sensitive detectors for gases: coated with a selective sorptive layer, they serve as a frequency determining element of an oscillator circuit. To perform a quantitative and qualitative analysis of organic gas mixtures with polymer coatings as sensitive membranes, it is necessary to use an array of several SAW sensors with different sensitivities towards various gaseous components. In this work, an automatic working, self purging and compact analytical microsystem for organic gas detection is presented. As the central component it contains an array of nine SAW resonators working at an operating frequency of 433.92 MHz. Eight sensor oscillators, one common reference oscillator for temperature compensation and circuits for frequency mixing are mounted within in a compact radial housing (diameter 108 mm). A broad variety of gaseous organic analytes can be detected using this microsystem. Of particular interest are hydrocarbons, halogenated hydrocarbons and aromatic compounds. Together with an automatic pattern recognition a qualitative as well as a quantitative analysis of these gases can be achieved","PeriodicalId":394363,"journal":{"name":"1994 Proceedings of IEEE Ultrasonics Symposium","volume":"3 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126114621","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
Vertical mode for an immersed structure composed of two elastic layers coupled by a thin water film 由水薄膜耦合的两个弹性层组成的浸入式结构的垂直模态
1994 Proceedings of IEEE Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1994.401754
M. Rousseau, F. Coulouvrat, O. Lenoir, H. Khelil, J. Izbicki
{"title":"Vertical mode for an immersed structure composed of two elastic layers coupled by a thin water film","authors":"M. Rousseau, F. Coulouvrat, O. Lenoir, H. Khelil, J. Izbicki","doi":"10.1109/ULTSYM.1994.401754","DOIUrl":"https://doi.org/10.1109/ULTSYM.1994.401754","url":null,"abstract":"We aim at evaluating the thickness of a thin water film, coupling two elastic layers. By a plane acoustic wave approach, we have shown the existence of a particular eigen-mode, called the vertical mode (V-mode), which strongly depends on the fluid layer. The water film thickness is expressed as a function of the V-mode cut-off frequency. The value of this particular frequency is experimentally obtained by a retrodiffusion and resonance spectra analysis. However, in practice, the acoustic waves propagate as a bounded beam, and it is necessary to show that the measurement accuracy remains compatible with a plane wave approach","PeriodicalId":394363,"journal":{"name":"1994 Proceedings of IEEE Ultrasonics Symposium","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126287693","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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