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Elastic constants of fiber-reinforced composites: a fresh measurement approach 纤维增强复合材料弹性常数:一种新的测量方法
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171565
H. Ledbetter, M. Lei
{"title":"Elastic constants of fiber-reinforced composites: a fresh measurement approach","authors":"H. Ledbetter, M. Lei","doi":"10.1109/ULTSYM.1990.171565","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171565","url":null,"abstract":"Composites reinforced with uniaxial fibers possess five independent elastic constants: C/sub 11/, C/sub 33/, C/sub 44/, C/sub 66/, and C/sub 13/. Measurements on a single specimen along principal axes give all the C/sub ij/ except C/sub 13/. To get C/sub 13/, a new approach is proposed that requires measurements only along principal directions: <100>. The approach also avoids the thin-plate problem, where measuring C/sub 22/ and C/sub 33/ may be difficult. A pulse-echo method is used to measure C/sub 11/, C/sub 44/, and C/sub 66/, and a resonance (kilohertz-frequency) method is used to measure two elastic compliances: S/sub 11/ and S/sub 33/. S/sub 44/ and S/sub 12/ come from simple formulas containing C/sub 44/ and C/sub 66/. S/sub 13/ comes from a relatively simple formula containing S/sub 11/, S/sub 12/, S/sub 33/, and C/sub 11/. The approach is applied to a graphite-magnesium composite.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"17 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116863750","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
An ultrasonic robot eye system for three-dimensional object recognition using neural network 基于神经网络的三维物体识别超声机器人眼系统
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171384
S. Watanabe, M. Yoneyama
{"title":"An ultrasonic robot eye system for three-dimensional object recognition using neural network","authors":"S. Watanabe, M. Yoneyama","doi":"10.1109/ULTSYM.1990.171384","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171384","url":null,"abstract":"A novel imaging system has been devised by combining acoustic imaging with neural networks. Information on ultrasonic scattered waves from objects is converted into an acoustic image. Several feature images are calculated, and then a neural network integrates their images and reconstructs a fine image. With this system, using simple shape objects as teaching patterns, images of unknown objects can be restored.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116988725","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
SAW scattering by perfectly conducting elliptic disk on anisotropic piezoelectric halfspace 完全导电椭圆盘在各向异性压电半空间上的SAW散射
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171335
E. Danicki
{"title":"SAW scattering by perfectly conducting elliptic disk on anisotropic piezoelectric halfspace","authors":"E. Danicki","doi":"10.1109/ULTSYM.1990.171335","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171335","url":null,"abstract":"A surface acoustic wave (SAW) propagating in an arbitrarily anisotropic piezoelectric halfspace is considered. The wave interacts with a perfectly conducting and weightless metal disk on the substrate surface by means of the electric potential only, which is coupled to the SAW due to the substrate piezoelectricity. A perturbation theory of the scattering of the plane harmonic SAW by the disk is presented which accounts for the dielectric and elastic anisotropy of the substrate. The solution for electric charge distribution on the disk is given in the form of a fast convergent series easy for computation. The angular dependence of the scattered SAW a large distance from the disk is discussed, and it is shown that the scattering pattern main lobe lies in the shadow area.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130997813","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
Thickness modes of vibration of contoured SBTC-cut quartz plates 轮廓型sbtc切割石英板的厚度振动模态
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171424
B. Sinha
{"title":"Thickness modes of vibration of contoured SBTC-cut quartz plates","authors":"B. Sinha","doi":"10.1109/ULTSYM.1990.171424","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171424","url":null,"abstract":"High-performance thickness-shear quartz resonators use trapped energy modes of vibration since these modes exhibit reduced mounting losses and possible reflections of anharmonic overtones from the electrode or plate boundaries. Trapped energy modes of vibration are obtained by appropriate contouring or beveling of the plate surfaces. The effect of contouring on energy trapping depends strongly on the crystalline orientation and the selected thickness harmonic mode of vibration. The earlier work of D. S. Stevens and H. F. Tiersten (1986) on the analysis of the SC-cut contoured quartz resonators for the C-mode of vibration is extended to obtain results for any of the three thickness (A-, B-, or C-) modes of vibration of any doubly-rotated cut of quartz.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"1994 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131148470","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
Software for multi-port RF network analysis with a large number of frequency samples and application to 5-port SAW device measurement 软件多端口射频网络分析与大量的频率样本和应用于5端口SAW设备测量
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171337
C. Hartmann, R.T. Hartmann
{"title":"Software for multi-port RF network analysis with a large number of frequency samples and application to 5-port SAW device measurement","authors":"C. Hartmann, R.T. Hartmann","doi":"10.1109/ULTSYM.1990.171337","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171337","url":null,"abstract":"A large project for experimentally measuring the properties of several-hundred SAW (surface acoustic wave) SPUDTs (single-phase unidirectional transducers) is discussed. To determine the desired SAW SPUDT properties, it was necessary to measure all elements of the five-port Y-matrix of each test device at a minimum of 8192 frequencies. The measurement was performed using a microwave wafer probe system in conjunction with a two-port network analyzer. Two different software packages are described. The first, the measurement software, allows the measurement of a large number of frequency samples with an HP8753 network analyzer. The second package, the data manipulation software, is more specialized in that it is only applicable to measured S-parameters from a special five-transducer test structure. Its computed results provide the equivalent of making direct experimental measurements at the two acoustic ports of the center transducer.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128212842","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: 17
A Green's function analysis of Schottky barrier diodes in strip-coupled transversal signal processing architectures 带状耦合横向信号处理架构中肖特基势垒二极管的格林函数分析
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171364
F. Fliegel
{"title":"A Green's function analysis of Schottky barrier diodes in strip-coupled transversal signal processing architectures","authors":"F. Fliegel","doi":"10.1109/ULTSYM.1990.171364","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171364","url":null,"abstract":"Theoretical and experimental results on Schottky barrier diodes in strip-coupled transversal signal processing architectures are presented. The need for a semiinsulating substrate for efficient SAW (surface acoustic wave) transduction and effective isolation of active circuit elements from one another, together with the need for high spatial sampling rates, is discussed. In ACT (acoustic charge transport) devices, the SAW used for transport of charge biases these Schottky diodes such that the diodes are laterally isolated from one another. This results in a strong dependence of nonlinear efficiency on both frequency and diode length. Substantial effects of DC bias on diode efficiency, and hence on convolver efficiency, are observed in ACT-based architectures, due to the bias induced by the clocking signal(s) present in such devices.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131960500","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
Gel-coated Lamb wave sensors 凝胶涂层Lamb波传感器
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171368
B. Costello, S. Wenzel, A. Wang, R. White
{"title":"Gel-coated Lamb wave sensors","authors":"B. Costello, S. Wenzel, A. Wang, R. White","doi":"10.1109/ULTSYM.1990.171368","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171368","url":null,"abstract":"Initial experiments and theory describing the operation of gel-coated Lamb wave sensors are described. The lowest-order flexural Lamb wave can propagate in gel-coated plates with low attenuation. This allows some novel sensing approaches to be investigated, such as: using gels as filters for larger particles and molecules, while allowing smaller analytes to diffuse through to the sensor surface, and realizing sensors based on gel density and viscoelastic changes. The authors develop two theories to predict the response of the sensor to the viscoelastic properties of the gel, and find excellent agreement predictions from these theories and those from a numerical simulation program for waves in multilayered media. One uses a Rayleigh-type solution with modified boundary conditions to derive the mechanical radiation impedance presented to the plate surface by the gel, and from this impedance calculates the phase velocity. The other uses a transmission line theory originally developed by A. Oliner et al.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134039895","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
Analysis of the acoustooptic interaction in proton-exchanged lithium niobate (light deflectors) 质子交换铌酸锂(偏转器)声光相互作用分析
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171433
E. Biebl, P. Russer
{"title":"Analysis of the acoustooptic interaction in proton-exchanged lithium niobate (light deflectors)","authors":"E. Biebl, P. Russer","doi":"10.1109/ULTSYM.1990.171433","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171433","url":null,"abstract":"The calculation of the efficiency of planar acoustooptic light deflectors based on PE:LiNbO/sub 3/ waveguides is presented. Both the collinear and the noncollinear interaction geometries on Y-cut LiNbO/sub 3/ are evaluated. By use of recently determined elastic stiffness constants of PE:LiNbO/sub 3/, the acoustic and electric field distributions of the propagating Rayleigh waves are calculated rigorously. Coupling between the optical modes is treated by a coupled mode approach. The dependence of the coupling strength on the acoustic frequency, mode type, and waveguide parameter is given.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133280229","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
The effects of ultrasonic irradiation on sprouting radish seed 超声波辐照对萝卜种子发芽的影响
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171652
S. Shimomura
{"title":"The effects of ultrasonic irradiation on sprouting radish seed","authors":"S. Shimomura","doi":"10.1109/ULTSYM.1990.171652","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171652","url":null,"abstract":"The author experimentally confirmed that by using ultrasonic irradiation, radish vegetable seeds immersed in water germinate and grow more rapidly than without irradiation. The ultrasonic intensity level was low enough not to generate thermal action caused by ultrasound propagation, which is generated by a piezoelectric 30-mm-diameter ceramic transducer which operates at a resonant frequency of 700 kHz and is excited by 0.38 W of electric power. In one vessel of styrofoam filled with water, radish seeds are immersed and the transducer is set up in front of the seeds. Another vessel is prepared to observe seeds growing naturally under water, at room temperature. The length of the root ultrasonically was 13% to 16% longer than the one grown naturally.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124543867","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
Growth and applications of piezoelectric and ferroelectric thin films 压电和铁电薄膜的生长和应用
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171422
T. Shiosaki
{"title":"Growth and applications of piezoelectric and ferroelectric thin films","authors":"T. Shiosaki","doi":"10.1109/ULTSYM.1990.171422","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171422","url":null,"abstract":"The importance of polar-axis-oriented films and epitaxial films of polar crystals in piezoelectric, pyroelectric, optical, and ferroelectric applications is emphasized. The applications of these films of polar crystals are reviewed. The recent development of an acoustooptic deflector made of ZnO thin-film optics and Si Schottky diode photodetectors integrated on a Si substrate is described. The growth of ferroelectric films by reactive magnetron sputtering and photo MOCVD and their properties related to ferroelectric memory applications are described.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127690385","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
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