Photo-acoustic imaging of surface acoustic wave slowness using multiplexed, two-wave mixing array interferometry

Yi Zhou*, Todd W. Murray, Sridhar Krishnaswamy

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

A method to rapidly measure the group velocities (or their inverse, slownesses) of surface acoustic waves (SAWs) in anisotropic materials is presented. Surface acoustic waves are generated using a pulsed laser focused to a point on a test object. A newly developed multiplexed two-wave mixing (MTWM) interferometer is used to simultaneously detect the SAW displacements along eight different directions using a circular array of detection points. The group velocity slowness curve is obtained directly from the measured signals from the MTWM array. The experimental results are compared to theoretical predictions in aluminum, silicon, and quartz.

Original languageEnglish (US)
Pages (from-to)1118-1123
Number of pages6
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume49
Issue number8
DOIs
StatePublished - Aug 1 2002

ASJC Scopus subject areas

  • Instrumentation
  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering

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