Layer-guided shear horizontally polarized acoustic plate modes

McHale, G., Newton, M.I. ORCID: 0000-0003-4231-1002 and Martin, F., 2002. Layer-guided shear horizontally polarized acoustic plate modes. Journal of Applied Physics, 91 (9), pp. 5735-5744. ISSN 0021-8979

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Abstract

The theoretical basis describing Love waves propagating on a finite thickness substrate covered by a finite thickness solid layer having a lower shear acoustic speed is considered. A generalized dispersion equation is derived for shear horizontally polarized acoustic waves in this system. Two types of solutions to the dispersion equation, both satisfying stress free boundary conditions at the free surfaces, are shown to exist. The first type of solution has a displacement that decays with depth into the substrate whilst the second does not. Analytical approximations to the solutions for a thin solid guiding layer show that these solutions can be considered as generalizations of Love waves and resonant shear horizontally polarized acoustic plate modes (SH-APM), respectively. Numerical solutions to the dispersion equation are developed and the spectrum of modes for thick guiding layers is examined with particular reference to sensor applications. As expected, increasing the thickness of the guiding layer leads to multiple Love wave modes. However, each of these Love wave modes is found to possess a set of shear horizontally polarized acoustic plate modes.

Item Type: Journal article
Description: Post-print
Publication Title: Journal of Applied Physics
Creators: McHale, G., Newton, M.I. and Martin, F.
Publisher: American Institute of Physics
Place of Publication: Melville, NY
Date: 2002
Volume: 91
Number: 9
ISSN: 0021-8979
Identifiers:
NumberType
10.1063/1.1465103DOI
Rights: Copyright ©2002 American Institute of Physics
Divisions: Schools > School of Science and Technology
Depositing User: EPrints Services
Date Added: 09 Oct 2015 10:44
Last Modified: 09 Jun 2017 13:37
URI: http://irep.ntu.ac.uk/id/eprint/17532

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