TY - JOUR
T1 - Ultrasonic signals generated by a laser source in film/substrate systems
AU - Murray, T. W.
AU - Guo, Z.
AU - Krishnaswamy, Sridhar
AU - Achenbach, Jan Drewes
PY - 1997/12/1
Y1 - 1997/12/1
N2 - 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.
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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M3 - Article
AN - SCOPUS:0347770464
VL - 17
SP - 57
EP - 65
JO - American Society of Mechanical Engineers (Publication) NDE
JF - American Society of Mechanical Engineers (Publication) NDE
ER -