1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)最新文献_第2页

Accurate equivalent circuits for unloaded piezoelectric resonators 空载压电谐振器的精确等效电路

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.661733

Stewart Sherrit, H. Wiederick, B. K. Mukherjee

{"title":"Accurate equivalent circuits for unloaded piezoelectric resonators","authors":"Stewart Sherrit, H. Wiederick, B. K. Mukherjee","doi":"10.1109/ULTSYM.1997.661733","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.661733","url":null,"abstract":"Equivalent circuit models for unloaded piezoelectric vibrators are presented. The new circuit model includes terms which take into account the dielectric and piezoelectric loss as well as the mechanical loss found in the standard Van Dyke's model. The new model contains two branches, the motional branch and the static branch, like the Van Dyke's model. However there is no resistance element in the motional branch and the losses (mechanical, dielectric, piezoelectric) associated with the vibrator are represented as imaginary components of the remaining circuit elements (C/sub 0/, C/sub 1/, L/sub 1/). The model produced impedance curves that very closely matched the impedance calculated by using the equation derived from vibration theory and data from lead zirconate titanate and PVDF copolymer samples. The calculation of the circuit parameters C/sub 0/, C/sub 1/, and L/sub 1/ from the complex elastic, dielectric and piezoelectric material constants is straightforward and the model accurately represents the impedance spectra about the fundamental resonance even when the mechanical Q of the resonator is as low as 2. Conversely, If the circuit parameters are known, the material constants including losses can be derived by straightforward calculations without the loss of any information.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"6 1","pages":"931-935 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84379972","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: 43

High frequency properties of new fine-grained modified lead titanate ceramics [transducers] 新型细晶改性钛酸铅陶瓷[换能器]的高频特性

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.661736

F. Levassort, M. Lethiecq, L. Tran-Huu-Hue, W. Wolny

引用次数: 5

Multiple apodized self-correlating tapped delay line for ID-tag and sensor applications 用于身份标签和传感器应用的多重自相关抽头延迟线

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.663037

T. Vandahl, S. Klett, W. Buff

引用次数: 4

On the problem of CW Doppler transducer optimization for linear cardiac output measurement via the suprasternal notch 经胸骨上切迹测量线性心输出量的连续波多普勒换能器优化问题

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.661811

P. Tsiganos, A. Fairhead

引用次数: 0

Measuring blood flow in the mouse embryo 测量小鼠胚胎的血流量

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.661858

O. Aristizábal, D. A. Christopher, F. Foster, D. H. Turnball

{"title":"Measuring blood flow in the mouse embryo","authors":"O. Aristizábal, D. A. Christopher, F. Foster, D. H. Turnball","doi":"10.1109/ULTSYM.1997.661858","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.661858","url":null,"abstract":"Extensive genetic information and the recent introduction of transgenic techniques for genetic manipulation have made the mouse the accepted model for normal cardiac development and congenital heart disease. An impediment to progress in this area has been the lack of noninvasive technologies to assess embryonic cardiovascular structure and function. The authors have developed a high frequency (40-50 MHz) ultrasound imaging and Doppler system enabling in vivo analysis of early embryonic cardiovascular development in the mouse. Simultaneous real-time image and Doppler data can be obtained noninvasively allowing, for the first time, measurements to be made of inflow and outflow characteristics of the mouse embryo heart and blood flow in the umbilical circulation. High resolution (measured lateral resolution=60-100 /spl mu/m) images are used to position the sample volume of the Doppler transducers. The 40 MHz CW Doppler system utilizes a pair of air backed LiNbO/sub 3/ transducers mounted on SMB connectors, and has been calibrated with a string phantom from 10 to 300 mm/s, velocities relevant to embryonic cardiovascular blood waveforms. Biphasic inflow waveforms were measured in normal 10 day mouse embryos (approximately equivalent to 4 weeks human) with peak blood velocities close to 200 mm/s. Outflow velocities in the same embryos were close to 70 mm/s while umbilical artery velocities were approximately 20 mm/s. Future studies will compare normal velocity data to measurements of mutant mice with specific defects in heart and placenta.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":"13 1","pages":"1489-1492 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79526640","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

Spectral broadening in conventional and harmonic Doppler measurements with gaseous contrast agents 气体造影剂在常规和谐波多普勒测量中的光谱展宽

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.663297

W. Shi, F. Forsberg, H. Oung

引用次数: 14

Super high electromechanical coupling and zero-temperature characteristics of KNbO/sub 3/ and its applications for low-loss wide band filters KNbO/sub 3/的超高机电耦合和零温度特性及其在低损耗宽带滤波器中的应用

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.663017

H. Odagawa, Takeshi Matsumura, K. Yamanouchi

引用次数: 5

High efficiency elastic convolver using KNbO/sub 3/ substrate 基于KNbO/sub - 3/衬底的高效弹性卷积器

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.663034

K. Yamanouchi, H. Odagawa, K. Morozumi, Y. Cho

引用次数: 4

Investigation of accelerated aging characteristics of a SAW filter SAW滤波器加速老化特性研究

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.662979

M.E. Woodberry, W. Hunt

引用次数: 1

Air coupled through transmission of aluminum and other recent results using MUTs 空气耦合通过传输铝和其他最近的结果使用mut

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.661745

I. Ladabaum, X. Jin, B. Khuri-Yakub

引用次数: 14