H.L. Bay, H.F. Winters, et al.
Applied Physics A Solids and Surfaces
We describe the generation and detection of short acoustic pulses (∼10-ns widths) in opaque plates, using weak laser pulses (less than 1-mJ energy) for excitation. The longitudinal, shear, and surface acoustic waves generated by a single laser pulse can be time resolved by using a thin-film piezoelectric transducer, and acoustic mode conversions at surfaces are clearly observable. This new photoacoustic material testing technique is useful for fast ultrasonic measurements or for detecting deep subsurface flaws.
H.L. Bay, H.F. Winters, et al.
Applied Physics A Solids and Surfaces
Holger Schroeder, A.C. Tam
Topical Meeting on Lasers in Materials Diagnostics 1986
H. Coufal, R.K. Grygier, et al.
Journal of the Acoustical Society of America
Hee K. Park, X. Zhang, et al.
Journal of Heat Transfer