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IEEE Symposium on Ultrasonics最新文献

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Ultrasound backscatter microscopy of the eye in vivo 眼内超声后向散射显微镜
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171612
F. Foster, C. Pavlin, B. Starkoski, K. Harasiewicz
{"title":"Ultrasound backscatter microscopy of the eye in vivo","authors":"F. Foster, C. Pavlin, B. Starkoski, K. Harasiewicz","doi":"10.1109/ULTSYM.1990.171612","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171612","url":null,"abstract":"The construction and early clinical evaluation of the first 50-100-MHz ultrasound backscatter microscope (UBM) are described. This system has a frame rate of five frames per second and examined a field of view of 4 by 4 mm with axial and lateral resolution ranging from 20 to 50 mu m. The critical components of the scanner are described, including the transducer, motion system, and scan converter. Clinical studies were performed on 40 patients with varied ocular pathology. Each patient was examined with UBM using a water-bath technique similar to that used in conventional eye ultrasound. Microscopic images of the normal structures of the anterior segment including the cornea, iris, Schlemm's canal, ciliary body, and sclera are shown. Contrasting images of corneal pathology, tumors of the iris and ciliary body, and angle closure demonstrate the exceptional measurement capabilities of this imaging method. The potential of the UBM as a practical clinical instrument is discussed.<<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":"125505328","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
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
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
Second order reflection effects in normal and oblique incidence gratings 正交和斜入射光栅中的二阶反射效应
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171346
H. Robinson, Y. Hahn, J. N. Gau
{"title":"Second order reflection effects in normal and oblique incidence gratings","authors":"H. Robinson, Y. Hahn, J. N. Gau","doi":"10.1109/ULTSYM.1990.171346","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171346","url":null,"abstract":"A general formulation is derived for calculating the first- and second-order (in the overlay height) effects in a SAW (surface acoustic wave) grating as a function of incidence angle and overlay material parameters. In general, the second-order effects detected experimentally exist both for normal and oblique incidence grooved gratings. The existence of a velocity shift at the first harmonic and reflection coefficient at the second harmonic for groove gratings at nearly all angles of incidence is demonstrated. The existence of these effects for metallic gratings is shown, although the character of these effects is quite different from that in the grooved case.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"47 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":"121728130","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
SAW waveguide-coupled resonator notch filter SAW波导耦合谐振器陷波滤波器
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171317
S. Gopani, B.A. Horine
{"title":"SAW waveguide-coupled resonator notch filter","authors":"S. Gopani, B.A. Horine","doi":"10.1109/ULTSYM.1990.171317","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171317","url":null,"abstract":"A unique implementation of a SAW (surface acoustic wave) notch filter using a two-pole waveguide-coupled (WGC) resonator in an allpass network is presented. This configuration exhibits a dramatic improvement in the bandwidth of the notch over the single-pole approach. This application of the two-pole WGC resonator design is discussed in detail, and results of a two-pole design at 193 MHz are presented. A cascaded four-pole resonator notch filter at 193 MHz with low passband loss and broadband notch depth greater than 40 dB is demonstrated. This notch filter is shown to be easy to tune, and exhibits excellent temperature characteristics.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"190 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":"121127827","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
Ultrasound speckle statistics variations with imaging systems impulse response 超声散斑统计随成像系统脉冲响应的变化
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171602
N. Rao, S. Mehra, H. Zhu
{"title":"Ultrasound speckle statistics variations with imaging systems impulse response","authors":"N. Rao, S. Mehra, H. Zhu","doi":"10.1109/ULTSYM.1990.171602","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171602","url":null,"abstract":"The effects of resolution cell size on the speckle statistics below the Rayleigh limit are studied. A three-dimensional simulation phantom that takes into account the 3-D distribution of scatterers and the 3-D nature of resolution cell volume has been used. The medium is modeled as uniform matrix material with discrete scatterers distributed randomly. Envelope detection from the simulated RF signal is carried out by using the Hilbert transform. An analysis of speckle statistics was carried out on the data.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"15 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":"116116912","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
Assessment of different pillar geometries for 1-3 composite transducers using finite element analysis 使用有限元分析评估1-3个复合传感器的不同柱形几何
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171393
J. Hossack, G. Hayward
{"title":"Assessment of different pillar geometries for 1-3 composite transducers using finite element analysis","authors":"J. Hossack, G. Hayward","doi":"10.1109/ULTSYM.1990.171393","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171393","url":null,"abstract":"Composite piezoelectric transducers, comprising piezoceramic pillars aligned within a polymer matrix, exhibit a high electromechanical coupling coefficient and a low acoustic impedance. Finite element analysis is used to investigate the dependence of device performance, in terms of electromechanical efficiency and vibrational uniformity, on pillar geometry. Results obtained by using alternative pillar shapes, including circular, square, and triangular geometries, are discussed, and an overall design strategy is formulated.<<ETX>>","PeriodicalId":412254,"journal":{"name":"IEEE Symposium on Ultrasonics","volume":"447 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":"116187910","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
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
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
Piezoelectric micromotors for microrobots 微型机器人用压电微电机
IEEE Symposium on Ultrasonics Pub Date : 1990-12-04 DOI: 10.1109/ULTSYM.1990.171545
A. Flynn, L. Tavrow, S. F. Bart, Rodney A. Brooks, Daniel J. Ehrlich, K. Udayakumar, L. E. Cross
{"title":"Piezoelectric micromotors for microrobots","authors":"A. Flynn, L. Tavrow, S. F. Bart, Rodney A. Brooks, Daniel J. Ehrlich, K. Udayakumar, L. E. Cross","doi":"10.1109/ULTSYM.1990.171545","DOIUrl":"https://doi.org/10.1109/ULTSYM.1990.171545","url":null,"abstract":"Small (a few millimeters in diameter) piezoelectric motors using ferroelectric thin films were fabricated. The films are designed to create a traveling wave in a stator structure. A small glass lens placed upon it becomes the spinning rotor. Piezoelectric ultrasonic motors overcome such problems associated with electrostatic micromotors as low torque, friction, and the need for high-voltage excitation. More importantly, they used offer a much simpler mechanism for coupling mechanical power out. Using thin films of lead zirconate titanate (PZT) on silicon nitride membranes, various types of actuator structures can be fabricated. Motors can be manufactured in a batch printing process instead of being individually machined. Combining new robot control systems with piezoelectric motors and micromechanics should make it possible to create micromechanical systems that are small, inexpensive, and completely autonomous.<<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":"121245104","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: 268
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