A.C. Tam, B. Bhushan
Journal of Applied Physics
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.
A.C. Tam, B. Bhushan
Journal of Applied Physics
A.C. Tam, W. Zapka, et al.
SPIE Microelectronic Processing Integration 1991
H. Coufal, T.J. Chuang, et al.
International Conference on Laser Processing and Diagnostics 1983
James H. Brannon, R.L. White, et al.
IEEE Transactions on Magnetics