1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)最新文献_第5页

Combination of ZnO film and quartz to realize large coupling factor and excellent temperature coefficient for SAW devices 将ZnO薄膜与石英结合，实现SAW器件的大耦合系数和优异的温度系数

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.663021

M. Kadota

{"title":"Combination of ZnO film and quartz to realize large coupling factor and excellent temperature coefficient for SAW devices","authors":"M. Kadota","doi":"10.1109/ULTSYM.1997.663021","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.663021","url":null,"abstract":"A good temperature coefficient of frequency (TCF) and an appropriate electromechanical coupling factor (k/sub s/) are required for applications of surface acoustic wave (SAW) devices requiring a specific bandwidth. An ST cut X propagation quartz substrate for Rayleigh SAW devices is known for its good TCF; however, its electromechanical coupling factor is as small as 0.0014 at k/sub s//sup 2/, so it is often unsuitable for applications of SAW devices requiring a specific bandwidth. Generally, most single crystals and thin films have a negative TCF. Only a few materials such as a quartz substrate having a specific cutting angle or a propagating direction and SiO/sub 2/ films have a positive TCF. Many investigations aimed at improving the TCF by depositing a SiO/sub 2/ film having a positive TCF on a substrate having a negative TCF have been reported on. However, since the absolute value of the TCF of such substrates is large, a relatively thick film of SiO/sub 2/ is required for compensation of its TCF. The author has theoretically and experimentally studied in detail the opposite combination, that is, the combination of a ZnO film having a negative TCF and a quartz substrate having an appropriate positive TCF, with selection of appropriate cutting and propagation angles of the substrate. As the result, the author could realize SAW substrates having an appropriate electromechanical coupling factor (k/sub s//sup 2/=0.011), a good TCF (/spl ap/Oppm//spl deg/C), and a zero power flow angle in structures of IDT/ZnO/quartz and IDT/ZnO/shorted-plane/quartz using an ST-cut 35/spl deg/X propagation quartz substrates (a 29/spl deg/45' rotated Y and a 42/spl deg/45' rotated Y plates 35/spl deg/X propagation quartz) for the first time.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"219 1","pages":"261-266 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75542425","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: 18

Investigation of longitudinal leaky surface acoustic wave on lithium niobate and quartz 铌酸锂和石英的纵向泄漏表面声波研究

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.663000

X. Tong, D. Zhang, Y. Li, Y. Shui

{"title":"Investigation of longitudinal leaky surface acoustic wave on lithium niobate and quartz","authors":"X. Tong, D. Zhang, Y. Li, Y. Shui","doi":"10.1109/ULTSYM.1997.663000","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.663000","url":null,"abstract":"The high frequency SAW transducers have shown great vitality in mobile phone and satellite communications and so on. One of the important ways to raise the working frequency and keeping the size of strips unchanged is to utilize the SAW devices based on high velocity acoustic wave modes. Therefore, the investigation of quasi-longitudinal acoustic surface leaky waves (QLASLWs) is of great significant because of its potential applications. Both theoretical and experimental results on LiNbO/sub 3/ and quartz are shown in this paper, for example, on LiNbO/sub 3/ in the range of Euler angles (0/spl deg/, /spl beta/, 90/spl deg/), the theoretical velocities are between 6000 m/s and 7000 m/s, nearly about twice that of normal surface waves, but the piezoelectric coupling coefficients varies between about 0.14% to 0.5%, much less than that of surface waves. The experimental results, for example, on LiNbO/sub 3/ at Euler angle (0/spl deg/, 38/spl deg/, 90/spl deg/), shows well agreement with the theoretical results. The theoretical results on quartz in the range of Euler angle (0/spl deg/, 124/spl deg/, /spl gamma/) are also shown in this paper.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"9 1","pages":"157-160 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72935632","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

Advanced mobile communications radiointerface (CTDMA) architecture based on SAW components 基于SAW组件的先进移动通信无线电接口(CTDMA)体系结构

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.663031

V.N. Kurskii, V. V. Proklov

引用次数: 3

Improved resolution and dynamic range in medical ultrasonic imaging using depth-dependent mismatched filtering 利用深度相关不匹配滤波提高医学超声成像的分辨率和动态范围

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.661855

A. R. Brenner, K. Eck, W. Wilhelm, T. Noll

引用次数: 14

A frequency spectral analysis of the fiber failure acoustic emission signal in a single fiber composite 单纤维复合材料中光纤失效声发射信号的频谱分析

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.663104

A. Calabro, C. Esposito, A. Lizza, M. Giordano, S. Tedesco, A. D’Amore, L. Nicolais

引用次数: 6

In vitro correlation of echogenicity and differential echogenicity with human prostate cancer grade 人前列腺癌分级与体外回声强度及差异回声强度的相关性

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.661777

M. L. Wicks, H. Sun, M. Russell, S. Neal, E. Boote, L. J. Anglo, G. Ross, T. Loy

{"title":"In vitro correlation of echogenicity and differential echogenicity with human prostate cancer grade","authors":"M. L. Wicks, H. Sun, M. Russell, S. Neal, E. Boote, L. J. Anglo, G. Ross, T. Loy","doi":"10.1109/ULTSYM.1997.661777","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.661777","url":null,"abstract":"Results are presented from an ongoing project at the University of Missouri-Columbia (MU) which focuses on the detection, grading, and staging of prostate cancer. The study addressed in this paper was performed in vitro using human prostates obtained from radical prostatectomies. Each prostate was transversely sectioned to extract a 2 mm slice which was then ultrasonically scanned. Cancerous and benign regions of the prostate were subsequently identified on the tissue slice by a pathologist. This scanning and analysis procedure allowed for a one-to-one correlation of actual tissue histopathology and acoustic parameter images. Echogenicity and differential echogenicity measures were calculated based on integrated backscatter, backscattered power spectra, and backscatter coefficient. Of these measures, only the backscatter coefficient, which was corrected for spatial variations in attenuation, showed a statistically significant trend with cancer grade. This trend suggests a new result which is that the inherent echogenicity of cancerous tissue decreases with increasing cancer grade.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"26 1","pages":"1127-1130 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81668600","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

Design and fabrication of a miniaturized annular array 小型化环形阵列的设计与制造

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.663341

N. Bourriot, Sylvain Ballandras, W. Steichen, P. Maitre, B. Piwakowski, J. Gelly, B. Piranda, R. Muksch

{"title":"Design and fabrication of a miniaturized annular array","authors":"N. Bourriot, Sylvain Ballandras, W. Steichen, P. Maitre, B. Piwakowski, J. Gelly, B. Piranda, R. Muksch","doi":"10.1109/ULTSYM.1997.663341","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.663341","url":null,"abstract":"Advances in microtechnology reinforce the interest in the development of miniaturized transducers for endoscopic imaging applications. The present work is devoted to the design and fabrication of miniaturized annular array transducer. A first design of the transducer has been performed using an analysis of the radiated pressure in a semi-infinite liquid based on a time-domain computation (DREAM program). The selected structure has been then simulated using an harmonic FEA taking piezoelectricity and material losses into account. A simplified boundary condition based on a plane wave radiation condition was used to simulate the immersed regime of the transducer. However, this approach allows one to estimate the pressure at the radiation surface of the transducer which can be used to improve the calculation of the acoustic pressure distribution in the liquid. The results of this design approach can be used to fabricate a test structure using ultrasound micromachining techniques adapted to sub-millimeter structure applications (resolution in the range 50 microns, machining depth close to 1 mm). A 2 mm diameter annular PZT structure has been built and tested. Theoretical and experimental results concerning the admittance of the annular array are compared. Design consideration for the fabrication of the 1.2 mm diameter transducer are exposed and discussed.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"3 1","pages":"1713-1716 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84176026","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: 5

Ultrasound biomicroscopy and magnetic resonance imaging of reconstituted articular cartilage 重建关节软骨的超声生物显微镜和磁共振成像

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.661781

K. Harasiewicz, H. Gahunia, C. Lemaire, N. Konyer, H.K.W. Kim, P. Babyn, K. Pritzker, F. Foster

引用次数: 0

Effect of humidity on SAW devices 湿度对SAW器件的影响

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.663050

V. Anisimkin, S. Maximov, P. Verardi, E. Verona

引用次数: 6

Boundary element solutions for acoustic wave propagation in media with nonuniform flow 声波在非均匀流动介质中传播的边界元解

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.663091

P. Eccardt, H. Landes, R. Lerch

{"title":"Boundary element solutions for acoustic wave propagation in media with nonuniform flow","authors":"P. Eccardt, H. Landes, R. Lerch","doi":"10.1109/ULTSYM.1997.663091","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.663091","url":null,"abstract":"The interaction between acoustic wave propagation and a fluid in motion can be described by a system of coupled equations. For many applications like ultrasound flowmeters, medical ultrasound diagnostics, environmental acoustics or air conditioning systems, the influence of the acoustic waves upon the flow can be neglected. This allows a separation and therefore a successive solution of the problem. The results of finite element (FEM) simulations based on a modified wave equation with the flow profile as a boundary condition have been previously presented. In this paper, a new boundary element (BEM) technique is reported to solve this problem. One major advantage over FEM is the reduced dimension of the problem, leading to easier meshing and, especially for unbounded domains, to reduced computational effort. For the new BEM approach the Green's function had to be modified to consider flow. Based on an approximate Green's function a boundary element solution was developed. This new approach is compared with the previously implemented FEM scheme as well as with experiments measuring the sound pressure in a flow channel for various geometries and flow profiles. The results show good agreement between experiment and simulation. The limitations of this approach will be discussed.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"57 1","pages":"593-596 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80228507","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