Rapid and accurate analysis of surface and pseudo-surface waves using adaptive laser ultrasound techniques

Yi Hong, Stephen D. Sharples, Matthew Clark, Michael Geoffrey Somekh

Research output: Journal article publicationConference articleAcademic researchpeer-review

14 Citations (Scopus)

Abstract

A method has been developed to measure the phase velocity of laser generated and detected surface acoustic waves. An optical grating produced by an electronically addressable spatial light modulator (SLM) was imaged onto the sample surface to generate surface acoustic waves whose frequency and wavefront was controlled by the SLM. When the grating period matched the surface acoustic wavelength, the surface wave was strongly excited, thus the wavelength and, thereby the phase velocity was determined. We present results with this method that allows the phase velocity and the angular dispersion of the generalized surface wave as well as the pseudo-surface wave on the (1 0 0) nickel to be measured. Measurements on (1 1 1) silicon single crystals are also presented. The measurement precision is approximately 0.2%. Methods to further improve the measurement precision are also discussed.
Original languageEnglish
Pages (from-to)515-518
Number of pages4
JournalUltrasonics
Volume42
Issue number1-9
DOIs
Publication statusPublished - 1 Apr 2004
Externally publishedYes
EventProceedings of Ultrasonics International 2003 - Granada, Spain
Duration: 30 Jun 20033 Jul 2003

Keywords

  • Anisotropy
  • Laser ultrasonics
  • Pseudo-surface waves
  • Spatial light modulator
  • Surface acoustic waves

ASJC Scopus subject areas

  • Medicine(all)
  • Acoustics and Ultrasonics

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