Journal ArticleDOI
Analysis of Generation and Detection of Surface and Bulk Acoustic Waves by Interdigital Transducers
TLDR
In this article, a method of analysis which uses a combination of analytical and numerical techniques has been developed to obtain an accurate solution to the coupled electromagnetic and acoustic fields set up by an interdigital transducer on the surface of a piezoelectric substrate.Abstract:
Ahrroct-A method of analysis which uses a combination of analytical and numerical techniques has been developed to obtain an accurate solution to the coupled electromagnetic and acoustic fields set up by an interdigital transducer on the surface of a piezoelectric substrate. Full account is taken of the coupling to bulk modes as well as surface modes, and the solution for the charge on the electrodes includes both electrostatic charge and piezoelectrically regenerated charge. Programs have been written for interdigital arrays with uniform aperture but varying electrode width and pitch and arbitrary electrical connections. The theory is also valid for arbitrary crystal orientations. Generation and detection may be analyzed separately with information being provided on the partition of power into the various acoustic modes and the external load impedance, and the bulk wave radiation patterns are also computed. The program may also be used to find the insertion loss of a pair of transducers. Results are presented for the BleusteinGulyaev orientation of PZT-4 ceramic and the YZ and 41” rotated YX orientations of lithium niobate.read more
Citations
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Journal ArticleDOI
Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics
James Friend,Leslie Y. Yeo +1 more
TL;DR: In this article, the use of acoustic fields, principally ultrasonics, for application in microfluidics is reviewed, and the abundance of interesting phenomena arising from nonlinear interactions in ultrasound that easily appear at these small scales is considered, especially in surface acoustic wave devices that are simple to fabricate with planar lithography techniques.
Proceedings ArticleDOI
Improved material constants for LiNbO/sub 3/ and LiTaO/sub 3/
TL;DR: In this paper, the influence of mechanical loading on SAW velocities on the entire surface of free and metallized substrates of 128 degrees rotY-LiNbO/sub 3/ was examined.
Journal ArticleDOI
Active droplet sorting in microfluidics: a review
Heng-Dong Xi,Hao Zheng,Wei Guo,Alfonso M. Gañán-Calvo,Ye Ai,Chia Wen Tsao,Jun Zhou,Weihua Li,Yanyi Huang,Nam-Trung Nguyen,Say Hwa Tan +10 more
TL;DR: This review presents state-of-the-art technologies which are implemented to efficiently sort droplets and classify the concepts according to the type of energy implemented into the system.
Journal ArticleDOI
Surface generated acoustic wave biosensors for the detection of pathogens: a review.
TL;DR: The state-of-the-art of SGAW biosensors for the detection of pathogens are described, being this topic an issue of extremely importance for the human health.
Book
Surface Acoustic Wave Filters: With Applications to Electronic Communications and Signal Processing
TL;DR: In this article, the fundamental principles and device design techniques for surface acoustic wave filters are discussed, as well as the latest technologies for low bandpass filters such as unidirectional transducers, resonators in impedance element filters, double-mode SAW filters and transverse-coupled resonators using waveguides.
References
More filters
Journal ArticleDOI
Analysis of Interdigital Surface Wave Transducers by Use of an Equivalent Circuit Model
TL;DR: In this paper, an acoustic surface wave transducers of the interdigital electrode form are used to represent the transducer as a chain of identical three-ports which are acoustically in cascade but electrically in parallel.
Journal ArticleDOI
A method for estimating optimal crystal cuts and propagation directions for excitation of piezoelectric surface waves
J.J. Campbell,W.R. Jones +1 more
TL;DR: In this article, a criterion for judging the relative effeciency of excitation of piezoelectric surface waves as a function of crystal plate orientation and propagation direction is developed based on a velocity change upon application of a thin conducting sheet to the surface.