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IEEE 1988 Ultrasonics Symposium Proceedings.最新文献

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Photothermal imaging of high T/sub c/ superconductor 高T/sub / c/超导体的光热成像
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49547
J. Fanton, G. Kino, B. Khuri-Yakub
{"title":"Photothermal imaging of high T/sub c/ superconductor","authors":"J. Fanton, G. Kino, B. Khuri-Yakub","doi":"10.1109/ULTSYM.1988.49547","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49547","url":null,"abstract":"The authors have demonstrated the ability to make high-resolution thermal conductivity measurements of ceramic superconductors. The technique is nondestructive, has submicron resolution, and can measure the conductivity in a specified direction. The authors have measured the anisotropy in thermal conductivity of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub x/ and found that the conduction along the Cu-O planes is six times greater than in the perpendicular direction. By incorporating refrigeration in their setup, they plan to measure the full, anisotropic thermal conductivity as a function of temperature, with particular emphasis on the behavior near T/sub c/.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"39 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":"128288060","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 new design for air transducers 一种空气传感器的新设计
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49428
B. Khuri-Yakub, J.H. Kim, C. Chou, P. Parent, G. Kino
{"title":"A new design for air transducers","authors":"B. Khuri-Yakub, J.H. Kim, C. Chou, P. Parent, G. Kino","doi":"10.1109/ULTSYM.1988.49428","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49428","url":null,"abstract":"Air transducers in the 0.5-10-MHz frequency range are made with either one or two matching layers for broadband and efficient coupling of ultrasound into air. The authors present a design for the optimum value of the impedance of a second matching layer of maximum bandwidth and insertion loss. Theoretical designs predict a functional bandwidth of 30% and a two-way insertion loss of 35 dBs for a device operating at 1 MHz. Experimental results are in excellent agreement with theory. Silica aerogel samples are characterized, and designs that demonstrate their potential as matching layers for air transducer applications are shown. Also, results of transmission imaging through carbon-epoxy and Kevlar-epoxy samples are shown.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"353 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":"124463595","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: 29
Spurious bulk waves in SAW filters with apodized transducers 带apozed换能器的SAW滤波器中的杂散体波
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49338
K. Wagner, G. Visintini
{"title":"Spurious bulk waves in SAW filters with apodized transducers","authors":"K. Wagner, G. Visintini","doi":"10.1109/ULTSYM.1988.49338","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49338","url":null,"abstract":"The authors report the simulation of the bulk wave transmission characteristics of planar acoustic devices on arbitrary substrates. Starting from the basic acoustoelectric differential equations, the analysis is based on the Green's function formalism and the Ritz-Galerkin method. In contrast to previously published papers, the authors apply these methods to devices with large apodized IDTs (interdigital transducers) and treat the interaction with bulk waves rigorously during generations as well as reception. They derive a CPIM (charge potential interrelation matrix) formulation of the voltage weighting analysis method for apodized IDTs and compare it with the track-by-track analysis method. Finally, simulation results of the spurious bulk wave responses of a TV filter with 170 IDT fingers are presented.<<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":"126001849","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
Acoustic emission monitoring of rolling element bearings 滚动轴承声发射监测
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49503
M. W. Hawman, W. Galinaitis
{"title":"Acoustic emission monitoring of rolling element bearings","authors":"M. W. Hawman, W. Galinaitis","doi":"10.1109/ULTSYM.1988.49503","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49503","url":null,"abstract":"The authors describe experimental efforts aimed at establishing the detection threshold for acoustic emission (AE) and vibration monitoring for a typical defect located in a standard ball bearing. An AE point contact transducer (PCT) has been developed: it is a rugged and compact device that can be used for various machinery diagnostic applications. Stress wave emissions in the frequency range above 100 kHz can provide a clear indication of the defect and thus provide an earlier and more reliable indication of bearing degradation. The digital data acquisition and analysis system used with the AE PCT is described, and AE and vibration analysis results are presented.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"32 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":"126421880","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: 62
A complete finite element-eigenmode analysis for a 1-3 type of piezoelectric composite transducer including the effect of fluid loading and internal losses 对1-3型压电复合材料换能器进行了完整的有限元特征模态分析，包括流体载荷和内部损耗的影响
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49465
J.‐H. Jeng, X. Bao, V. Varadan, V. K. Varadan
{"title":"A complete finite element-eigenmode analysis for a 1-3 type of piezoelectric composite transducer including the effect of fluid loading and internal losses","authors":"J.‐H. Jeng, X. Bao, V. Varadan, V. K. Varadan","doi":"10.1109/ULTSYM.1988.49465","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49465","url":null,"abstract":"A complete finite element-eigenmode method is applied to analyze the performance of a 1-3-type transducer under actual working conditions. The effect of fluid loading, internal losses, driving impedance, and microstructure variation are all taken into account. Via the finite element analysis, the constitutive equations for a piezoelectric material are discretized into a set of algebraic equations. The fluid loading is considered as an exciting force acting on the transducer surface. On the basis of the analysis, the resonance spectrum and electrical admittance spectrum are calculated with the condition of constant D-field. The proposed method provides an efficient way of designing a 1-3-type transducer. Preliminary calculations were made for the purpose of verification, and results show good agreement.<<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":"126760657","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
Stopband-edge frequencies in the resonance spectra of piezoelectric periodic composite plates 压电周期性复合材料板谐振谱中的禁带边缘频率
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49452
A. Alippi, F. Craciun, E. Molinari
{"title":"Stopband-edge frequencies in the resonance spectra of piezoelectric periodic composite plates","authors":"A. Alippi, F. Craciun, E. Molinari","doi":"10.1109/ULTSYM.1988.49452","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49452","url":null,"abstract":"The stopband-edge frequencies of periodic composite plates made of alternating elements of piezoelectric ceramic and epoxy resin are studied both theoretically and experimentally. A model is proposed for the transmission function of plates with a finite number of elements below their thickness resonance, and the results are compared with the electrically excited acoustical resonances of samples with different structural parameters (size and number of elements, and volumic fraction). The excellent agreement between theory and experiments supports possibility of using the present approach to tailor the resonance spectra of composites in the below-thickness regime by varying their structural parameters in a controlled way.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"65 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":"122585081","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
SAW/FET programmable filter with varistor taps for improved performance SAW/FET可编程滤波器与压敏电阻抽头，以提高性能
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49361
D. Oates, D. Smythe, J.B. Green, R. Withers
{"title":"SAW/FET programmable filter with varistor taps for improved performance","authors":"D. Oates, D. Smythe, J.B. Green, R. Withers","doi":"10.1109/ULTSYM.1988.49361","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49361","url":null,"abstract":"The SAW (surface acoustic wave)/FET (field-effect transistor) programmable transversal filter utilizes a LiNbO/sub 3/ SAW delay line that is coupled to a silicon integrated circuit across a 300 nm air gap. A SAW/FET with an integrated circuit that incorporates a varistor-controlled tap-weighting circuit has been built. The varistor is a MOSFET (metal-oxide-silicon FET) whose resistance determines the tap weight and is controlled by the voltage stored on the capacitance of the MOSFET gate. The integrated circuit contains the taps, tap weighting and RF summing circuitry to accomplish the transversal filter function. A digital shift register operates as a commutator that allows serial programming of the individual analog tap weights. There are 350 analog taps that yield a 1.5- mu s delay with a programmable bandwidth of 100 MHz at a center frequency of 175 MHz. The programmable tap on/off is greater than 30 dB with a +or-1.0-dB uniformity. When programmed as a narrowband filter, the out-of-band rejection is greater than 35 dB across the entire 100-MHz programmable bandwidth.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"143 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":"122772769","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
Ultrasonic butt welding of aluminium, anticorrosive aluminium and copper plate specimens 铝、防腐铝、铜板试样的超声波对焊
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49426
J. Tsujino, T. Ueoka
{"title":"Ultrasonic butt welding of aluminium, anticorrosive aluminium and copper plate specimens","authors":"J. Tsujino, T. Ueoka","doi":"10.1109/ULTSYM.1988.49426","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49426","url":null,"abstract":"Ultrasonic butt welding of thick metal plate specimens is studied. Welding specimens used are aluminium, anticorrosive aluminium, and copper plates of 6-mm thickness. These welding specimens are successfully joined end to end with specimen strength of about 100 MPa (pure aluminium) or 250 MPa (anticorrosive aluminium) using 26-kHz or 19-kHz butt welding equipment. An ultrasonic vibration source of 19 kHz uses eight bolt-clamped Langevin-type PZT transducers of 50-mm diameter. The power required for joining aluminium, anticorrosive aluminium specimens, and anticorrosive aluminium to copper specimens is found to be 1-3 kW/cm/sup 2/, 6-8 kW/cm/sup 2/, and 7-9 kW/cm/sup 2/, respectively.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"130 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":"127487122","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
Composite transducer with multiple piezoelectric matching layers 具有多个压电匹配层的复合换能器
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49429
Q.C. Xu, C. Madhavan, T. T. Srinivasan, S. Yoshikawa, R. Newnham
{"title":"Composite transducer with multiple piezoelectric matching layers","authors":"Q.C. Xu, C. Madhavan, T. T. Srinivasan, S. Yoshikawa, R. Newnham","doi":"10.1109/ULTSYM.1988.49429","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49429","url":null,"abstract":"Trilaminate transducers have been constructed from fired 0-3 piezoelectric materials and nonvoided thick piezoelectric polymer as two matching layers on ceramic PbTiO/sub 3/. Based on the physical properties of the constituent materials, the equivalent circuit of this composite transducer has been established. The frequency response of transmitting, receiving, and voltage transition gain (VTG) for different layers and their hybrid connection was computed and compared with the experimental results. The frequency response of the composite transducer is considerably improved by changing the connecting modes between the layers. Different layers are shown to make different contributions to the frequency dependence of the sensitivity. The transducer impedence and sensitivity response can be adjusted depending on the application.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"14 15","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113984764","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: 15
Interactive PC software for SAW propagation in anisotropic multilayers 各向异性多层声表面波传播的交互式PC软件
IEEE 1988 Ultrasonics Symposium Proceedings. Pub Date : 1988-10-02 DOI: 10.1109/ULTSYM.1988.49350
E. Adler, G. Farnell, J. K. Slaboszewicz, C. Jen
{"title":"Interactive PC software for SAW propagation in anisotropic multilayers","authors":"E. Adler, G. Farnell, J. K. Slaboszewicz, C. Jen","doi":"10.1109/ULTSYM.1988.49350","DOIUrl":"https://doi.org/10.1109/ULTSYM.1988.49350","url":null,"abstract":"A software package which provides an interactive, graphical, and computational environment for surface-acoustic wave (SAW) and plate-mode propagation studies in arbitrarily oriented anisotropic and piezoelectric multilayers is described. The software, which runs on an IBM PC with maths coprocessor, is based on a transfer-matrix formulation for calculating the characteristics of SAW propagation in multilayers, originally written for a mainframe computer. The menu-driven software will calculate wave velocities and field variable variations with depth for any desired propagation direction; the graphics capability provides a simultaneous display of slowness or velocity and of SAW Delta v/v coupling constant curves and their corresponding field profiles in either polar or Cartesian coordinates for propagation in a selected plant or as a function of one of the Euler angles. The program generates a numerical data file containing the calculated velocities and field profile data. Examples illustrating the usefulness of the software in studying various SAW structures are presented.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"51 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":"124111134","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: 13
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