Conference paper
Overview of photothermal spectroscopy
A.C. Tam
LEOS 1990
We describe a photoacoustic ultrasonic imaging system that can provide separate acoustic information on a thick substrate and a thin coating simultaneously. This is achieved by generating an ultranarrow longitudinal pulse on the opaque layered sample, and detecting the series of substrate and coating echoes in high time resolution. The echo times, attenuations, and acoustic dispersions in each series provide information on the substrate or coating separately. New photoacoustic images of coatings and of substrates for coated ceramic substrates are presented.
A.C. Tam
LEOS 1990
J.L. Brand, A.C. Tam
Applied Physics Letters
H. Sontag, A.C. Tam
Canadian journal of physics
W. Zapka, Winfrid Ziemlich, et al.
Microelectronic Engineering