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Measurement and Modelling for the Dispersion Relations of Acoustic Waves Propagating in a Free Piezoelectric Plate

Published online by Cambridge University Press:  05 May 2011

C. H. Yang  and
M. F. Huang
C. H. Yang*
Affiliation:
Department of Mechanical Engineering, Chang Gung University, Kwei-Shan, Taoyuan, Taiwan 33302, R.O.C.
M. F. Huang*
Affiliation:
Department of Mechanical Engineering, Chang Gung University, Kwei-Shan, Taoyuan, Taiwan 33302, R.O.C.
*
*Professor
** Graduate Student
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Abstract

This research is focused in the measurement and modelling of the dispersion relations of Lamb waves propagating in a piezoelectric plate. A theoretical model based on a partial wave analysis is used to provide numerical calculations for the dispersion relations of Lamb waves propagating in an LiNbO3 plate with different propagating directions. The dispersion relations are presented in an innovative image format. A non-contact laser ultrasound technique operated in B-scan mode with the aid of double Fast Fourier transform signal-processing scheme is used to measured multi-mode dispersion realtions. Among all the propagation angles, the measured dispersion curves show good agreement with the theoretical calculations. The Rayleigh wave speeds are extracted from the measured and calculated dispersion curves, showing favorable comparison with classical theory by Campbell.

Keywords

LiNbO3Lamb waveLaser ultrasonicsDispersion.
Type
Articles
Information
Journal of Mechanics , Volume 19 , Issue 2 , June 2003 , pp. 311 - 318
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2003

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