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

T. W. Murray; Z. Guo; Sridhar Krishnaswamy; Jan Drewes Achenbach

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 journal › Article › peer-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 language	English (US)
Pages (from-to)	57-65
Number of pages	9
Journal	American Society of Mechanical Engineers (Publication) NDE
Volume	17
State	Published - Dec 1 1997

ASJC Scopus subject areas

Mechanical Engineering

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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.",

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AB - 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.

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