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IEEE 1987 Ultrasonics Symposium最新文献

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Programmable Transversal Filters: Applications and Capabilities 可编程横向过滤器:应用和功能
IEEE 1987 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1987.198923
J. Cafarella
{"title":"Programmable Transversal Filters: Applications and Capabilities","authors":"J. Cafarella","doi":"10.1109/ULTSYM.1987.198923","DOIUrl":"https://doi.org/10.1109/ULTSYM.1987.198923","url":null,"abstract":"Transversal filters, which have found wide application in signal processing, consist of a delay medium and taps to replicate an input signal at various lags, and means for weighting and summing of these replicas to provide an output signal. The pattern of the tap weights constitutes a filtering function; a structure which enables this function to be changed readily is referred to as a programmable transversal filter. This paper will describe PTF parameters and attributes in light of various systems applications. Examples of parameters that must be considered when selecting a component are bandwidth, number of taps, dynamic range, accuracy, linearity, and programming rate. After discussing applications, various SAW approaches to implementing PTFs will be reviewed, as will alternate approaches.","PeriodicalId":309261,"journal":{"name":"IEEE 1987 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":"124457366","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
Ultrasonic Wire Bonding Using a Complex Vibration Welding Tip 复合振动焊头超声焊丝
IEEE 1987 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1987.199031
J. Tsujino
{"title":"Ultrasonic Wire Bonding Using a Complex Vibration Welding Tip","authors":"J. Tsujino","doi":"10.1109/ULTSYM.1987.199031","DOIUrl":"https://doi.org/10.1109/ULTSYM.1987.199031","url":null,"abstract":"Ultrasonic wire bonding using a complex vibration welding tip is proposed and studied to improve welding characteristics of ultrasonic wire bonding of thin various metal wires. The welding system designed consists of a complex transverse vibration rod driven by a 40 kHz and a 60 kHz ultrasonic longitudinal vibration systems. These vibration systems are driven simultaneously by independent vibration controllers and amplifiers. Welding specimens used are 0.05 mm to 0.15 mm diameter aluminum wires and 1.0 mm thick copper plates. These welding specimens are welded successfully by the complex vibration welding equipment. And also, using this method, the weld strength of wire bonding becomes independent to the direction difference between welding tip vibration and wire length.","PeriodicalId":309261,"journal":{"name":"IEEE 1987 Ultrasonics Symposium","volume":"47 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":"126629432","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
Theory of MSSW Convolution MSSW卷积理论
IEEE 1987 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1987.198957
J. Parekh, H. Tuan, A. Desai
{"title":"Theory of MSSW Convolution","authors":"J. Parekh, H. Tuan, A. Desai","doi":"10.1109/ULTSYM.1987.198957","DOIUrl":"https://doi.org/10.1109/ULTSYM.1987.198957","url":null,"abstract":"The present work reports a theoretical study of the convolution of contra-propagating magnetostatic surface waves (MSSWs) in a YIG film. Computations of the induced convolution voltage in a pickup loop and the internal efficiency of the convolution process are presented as functions of frequency as well as the thickness of the YIG film. In agreement with expectation, the convolution voltage goes down with increase in frequency or thickness of the YIG film, i.e., with increased decoupling of the two contra-propagating MSSWs. The bandwidth for convolver operation is predicted to be better for MSSW than for magnetostatic forward volume waves (MSFVWs) or magnetostatic backward volume waves (MSBVWs)","PeriodicalId":309261,"journal":{"name":"IEEE 1987 Ultrasonics Symposium","volume":"108 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":"115074777","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
Iterative Synthesis of Optimized Surface Acoustic Wave Chirp Waveform Conpression Filter Impulse Response 优化表面声波啁啾波形压缩滤波器脉冲响应的迭代合成
IEEE 1987 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1987.198955
M. Haspel
{"title":"Iterative Synthesis of Optimized Surface Acoustic Wave Chirp Waveform Conpression Filter Impulse Response","authors":"M. Haspel","doi":"10.1109/ULTSYM.1987.198955","DOIUrl":"https://doi.org/10.1109/ULTSYM.1987.198955","url":null,"abstract":"AS is well known, direct application of weighting functions to chirp matched filters to affect sidelobe suppression yields inferior results as signal time-bandwidth product (TBP) decreases. A standard frequency domain alternative produces infinitely long impulse responses (Paley-Wiener condition). Truncation to yield feasible SAW device designs, introduces \"gating sidelobes\", especially severe for low TBP. This paper describes an approach for improved finite length juxtaposition of iterative algorithms which develop solutions with concomitant significant improvement. Among the solutions are those with desirable quasi-uniform sidelobe structure and significant suppression, approaching that associated with the window template, with virtually no degradation in the other parameters when compared with the standard methods. impulse response construction by","PeriodicalId":309261,"journal":{"name":"IEEE 1987 Ultrasonics Symposium","volume":"37 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":"116089867","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
Differentially Detected Channelized Resonator Filter 差分检测通道化谐振器滤波器
IEEE 1987 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1987.198939
H. Fredricksen, L. Solie
{"title":"Differentially Detected Channelized Resonator Filter","authors":"H. Fredricksen, L. Solie","doi":"10.1109/ULTSYM.1987.198939","DOIUrl":"https://doi.org/10.1109/ULTSYM.1987.198939","url":null,"abstract":"Two resonators are connected together so they share the same input transducer but the output transducer for the second channel is 180° different in phase from the first. The result is zero output voltage for the direct transmission from input to output transducer. This helps achieve high out-of-band rejection. If the resonant frequencies of the two channels are now designed to be slightly different, the two channels will no longer cancel: and if the difference in frequency makes the crossover at the 3 dB pt, the two outputs will add to make a continuous, steeply sided, pass band filter. Such a narrow-band filter has been made and various problems and their solutions are presented.","PeriodicalId":309261,"journal":{"name":"IEEE 1987 Ultrasonics Symposium","volume":"11 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":"122306780","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
Temperature Characteristics of Rayleigh Wave in SiO2/128oY-X LiNbO3Structure sio2 / 12oy - x linbo3结构中瑞利波的温度特性
IEEE 1987 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1987.198961
J. Yin, Wen Wu, D. Zhang, Y. Shui
{"title":"Temperature Characteristics of Rayleigh Wave in SiO2/128oY-X LiNbO3Structure","authors":"J. Yin, Wen Wu, D. Zhang, Y. Shui","doi":"10.1109/ULTSYM.1987.198961","DOIUrl":"https://doi.org/10.1109/ULTSYM.1987.198961","url":null,"abstract":"Y-cut X propagation LiNbO is surface acoustic wave (SAW) devices due to its high electro-mechanical coupling coefficient and low spurious response. But its temperature coefficient of delay (TCD) is large. Yamanouchi et a1 have investigated the propagation characteristics of layered structure consisting of an Si02 film on 128\" Y-X LiNbO3 for SAW. In this paper the temperature dependence of M I € of this layered structure versus h/X for first and second order Rayleigh wave has been further studied theoretically and experimentally.when h/X =0.21, TCD=O occurs at about T=40°C and the variation of Af/f is less than 160 ppm as temperature changes from 40°C to 7OOC. Different film thickness leads to different zero TCD point. Experimental results are in agreement with theoretical predictions.","PeriodicalId":309261,"journal":{"name":"IEEE 1987 Ultrasonics Symposium","volume":"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":"122914765","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
A Method of Demodulating Frequency Shift for Pulsed Ultrasonic Doppler Blood Flow Imaging 脉冲超声多普勒血流成像的解调频移方法
IEEE 1987 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1987.199088
Huaguang Kang, Jian-Nong Zhang, S. Zou
{"title":"A Method of Demodulating Frequency Shift for Pulsed Ultrasonic Doppler Blood Flow Imaging","authors":"Huaguang Kang, Jian-Nong Zhang, S. Zou","doi":"10.1109/ULTSYM.1987.199088","DOIUrl":"https://doi.org/10.1109/ULTSYM.1987.199088","url":null,"abstract":"Based on the i sotropic, independent b lood cell with a single reflecting model and assuming that t he d istribution of blood cell velocity is Guassian, we have derived a demodulating expression of the real-time Doppler central frequency shift. Using this technique, we can realize t he Doppler blood f low imaging. The analytic results show that t he e rror can be controlled w ithin some allowable range. The experimental results also show that this method is practicable.","PeriodicalId":309261,"journal":{"name":"IEEE 1987 Ultrasonics Symposium","volume":"66 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":"116726842","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
Analysis and Design of Acoustic Fiber Coupler 声学光纤耦合器的分析与设计
IEEE 1987 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1987.198997
A. Safaai‐Jazi
{"title":"Analysis and Design of Acoustic Fiber Coupler","authors":"A. Safaai‐Jazi","doi":"10.1109/ULTSYM.1987.198997","DOIUrl":"https://doi.org/10.1109/ULTSYM.1987.198997","url":null,"abstract":"A coupled-mode theory for two parallel cylindrical acoustic waveguides with a common cladding is presented. The theory illuminates the mechanism responsible for the oscillation of power between the two waveguides. The method of analysis is based upon the expansion of the fields of the composite waveguide in terms of the modal fields of the individual guides. The analysis is then applied to the problem of an acoustic fiber coupler made of two identical weakly guiding fibers. Coupling coefficient and its variations with guides separation and the frequency response of the coupler are examined. Design of 3 dB couplers as power dividers is addressed. A bandpass filter constructed with acoustic fiber couplers is proposed.","PeriodicalId":309261,"journal":{"name":"IEEE 1987 Ultrasonics Symposium","volume":"13 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":"129602130","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
Effect of Ceramic Anisotropy on the Properties of Ceramic/Polymer Piezoelectric Composites 陶瓷各向异性对陶瓷/聚合物压电复合材料性能的影响
IEEE 1987 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1987.199039
H. Chan, J. Unsworth, T. Bui
{"title":"Effect of Ceramic Anisotropy on the Properties of Ceramic/Polymer Piezoelectric Composites","authors":"H. Chan, J. Unsworth, T. Bui","doi":"10.1109/ULTSYM.1987.199039","DOIUrl":"https://doi.org/10.1109/ULTSYM.1987.199039","url":null,"abstract":"0.29 1.40 0.26 0.50 65.0 0.33 3.60 0.26 0.42 68.0 1.0 1.40 0.06 0.52 68.2 Fraction (mm) ABSTRACT Modified lead titanate/polymer 1-3 composites are fabricated and their resonance characteristics determined. Mode coupling theory is applied to the pillar-shaped ceramic elements inside the 1-3 composite. Coupling of lateral and thickness mode vibrations occurs as the width to thickness ratio increases and the experimental results agree well with the mode coupling theory predictions. It is found that the piezoelectric properties of PbTiO3/epoxy composites are similar to that of PZT/epoxy composites, except that the coupling constants of lead titanate are very small because of the ceramic anisotropy. The thickness mode resonant frequency times the thickness value f.H stays steady and close t o the uncoupled value as the configurational (width /thickness)L/H ratio is increased from 0.1 to 1.0. In the range L/H = 1.0 to 1.5 the thickness and lateral mode vibrations couple. Above L/H = 1.5 these modes decouple and are easily resolved, the thickness mode becomes again close t o the uncoupled value. Lead titanatefepoxy composites geometries can therefore be selected with L/H > 1.5 which make better medical ultrasonic transducers than PZT/epoxy types.","PeriodicalId":309261,"journal":{"name":"IEEE 1987 Ultrasonics Symposium","volume":"64 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":"129693504","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: 6
Acoustic Microscopy with Shear Wave Transducers 使用剪切波换能器的声学显微镜
IEEE 1987 Ultrasonics Symposium Pub Date : 1900-01-01 DOI: 10.1109/ULTSYM.1987.199071
C. Chou, B. Khuri-Yakub, K. Liang
{"title":"Acoustic Microscopy with Shear Wave Transducers","authors":"C. Chou, B. Khuri-Yakub, K. Liang","doi":"10.1109/ULTSYM.1987.199071","DOIUrl":"https://doi.org/10.1109/ULTSYM.1987.199071","url":null,"abstract":"","PeriodicalId":309261,"journal":{"name":"IEEE 1987 Ultrasonics Symposium","volume":"11 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":"128661899","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: 11
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