Proceedings. IEEE Ultrasonics Symposium最新文献_第3页

Applications of laser-trimming for all-quartz package, surface acoustic wave devices 激光切边在全石英封装、表面声波器件中的应用

Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66979

J. Greer, G. K. Montress, T. Parker

{"title":"Applications of laser-trimming for all-quartz package, surface acoustic wave devices","authors":"J. Greer, G. K. Montress, T. Parker","doi":"10.1109/ULTSYM.1989.66979","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.66979","url":null,"abstract":"A laser-based technique that allows the frequency of sealed, all-quartz package (AQP) surface acoustic wave (SAW) resonators to be accurately set to within +or-1 p.p.m. of a prescribed frequency has previously been reported (J.A. Greer et al., 1987). SAW resonator devices in the range of 300 MHz to 1 GHz have been laser-trimmed by as much as 100 p.p.m. The laser-trimming process is extended to a variety of new applications, including accurately adjusting the insertion phase shift of AQP SAW delay lines by as much as 90 degrees ; effectively suppressing the distortion caused by the third-order transverse mode in resonators with nonapodized transducers, which usually results in improved insertion phase shift and insertion-loss responses for the device; and frequency trimming, used either to form accurately matched pairs of AQP SAW resonators for high-power applications by effectively doubling the acoustic aperture using two SAW resonators fabricated on the same substrate surface, or to form matched pairs of devices fabricated on opposite surfaces of the same substrate. The latter application is for high-vibration environments, reducing the combined vibration sensitivity due to the cancellation of strain-induced frequency shifts. The influence of laser-trimming on the residual flicker noise and long-term frequency stability of AQP SAW devices is discussed.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"1 1","pages":"179-184 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76801959","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

Theoretical analysis of relations between directivity of SAW transducer and its dispersion curves 声表面波换能器指向性与色散曲线关系的理论分析

Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66961

Z.H. Chen, K. Yamanouchi

引用次数: 10

Guided-wave acoustooptic Bragg cells in GaAs and application at GHz frequencies GaAs中的导波声光Bragg单元及其在GHz频率下的应用

Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67034

Y. Abdelrazek, C. Tsai

引用次数: 2

Fundamentals of charge storage in acoustic charge transport devices 声学电荷传输器件中电荷存储的基本原理

Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66985

B. Schmukler

引用次数: 0

SAW programmable notch filters for adaptive interference suppression 用于自适应干扰抑制的SAW可编程陷波滤波器

Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66983

K. Sugai, H. Takakuni, O. Noguchi, K. Omori

引用次数: 5

Real time ultrasonic phase conjugation 实时超声相位共轭

Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67071

M. Nikoonahad, T. Pusateri

引用次数: 1

Efficient design tool for SAW-resonator filters saw谐振器滤波器的高效设计工具

Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66973

G. Scholl, A. Christ, H. Grassl, W. Ruile, P. Russer, R. Weigel

引用次数: 15

VF/sub 2//VF/sub 3/ copolymer hydrophone for ultrasonic power measurements VF/sub 2//VF/sub 3/共聚物水听器用于超声功率测量

Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67057

H. Chan, A. H. Ramelan, I. Guy, D. Price

引用次数: 0

Scattering of piezoelectric surface transverse waves from electrodes with arbitrary h/ lambda 任意h/ λ电极对压电表面横波的散射

Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.67013

A. Baghai-Wadji

{"title":"Scattering of piezoelectric surface transverse waves from electrodes with arbitrary h/ lambda","authors":"A. Baghai-Wadji","doi":"10.1109/ULTSYM.1989.67013","DOIUrl":"https://doi.org/10.1109/ULTSYM.1989.67013","url":null,"abstract":"The problem of scattering of surface transverse waves (STWs) from a finite number of massive, elastic fingers with large relative height (thickness) h/ lambda on piezoelectric substrates is solved by determining the stress and the electric charge densities induced in the finger-substrate interfaces by the impinged waves. Two different mechanisms for the excitation of STW are considered: electrical excitation by a line charge and mechanical excitation by a line force. The resulting responses of the piezoelectric half-space to these elemental excitations lead to a 2*2 dyadic Green's function G(x,z). It is shown that G(x,z) is capable of describing the mass-loading effect and the natural unidirectionality phenomenon. Based on a reinterpretation of a previous formulation, the complex-valued, frequency-dependent stress distributions on the finger-substrate interfaces induced by the incident STW are calculated exactly. For the calculation of the reexcited acoustic waves, the induced stress is used as the driving term in a first step. The convolution of this equivalent force with the mechanical and the electrical Green's functions yields the scattered-field patterns.<<ETX>>","PeriodicalId":89469,"journal":{"name":"Proceedings. IEEE Ultrasonics Symposium","volume":"51 1","pages":"377-380 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80659507","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

A coupling-of-modes analysis of chirped transducers containing reflective electrode geometries 包含反射电极几何形状的啁啾换能器的模式耦合分析

Proceedings. IEEE Ultrasonics Symposium Pub Date : 1989-10-03 DOI: 10.1109/ULTSYM.1989.66972

B. Abbott, C. Hartmann, D. Malocha

引用次数: 58