Ultrasonic signals generated by a laser source in film/substrate systems

T. W. Murray*, Z. Guo, Sridhar Krishnaswamy, Jan Drewes Achenbach

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A model for the pulsed laser generation of ultrasound in an isotropic film on a semi-infinite substrate is presented. The model gives the time domain displacement of the system as a function of the density and mechanical properties of the film and substrate and the thermal properties of the film. Theoretical signals are calculated and analyzed for both a slow layer on a fast substrate and a fast layer on a slow substrate. The model has been verified experimentally using a 1 ns Nd:YAG laser source for acoustic wave generation and a stabilized Michelson interferometer for detection. Experimental and theoretical signals agree well for both fast on slow and slow on fast systems.

Original languageEnglish (US)
Pages (from-to)57-65
Number of pages9
JournalAmerican Society of Mechanical Engineers (Publication) NDE
Volume17
StatePublished - Dec 1 1997

ASJC Scopus subject areas

  • Mechanical Engineering

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