Observation of Subsurface Structures by Scanning Laser Photoacoustic Spectroscopy
- 1 January 1981
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 20 (1) , L25
- https://doi.org/10.1143/jjap.20.l25
Abstract
Aiming at the detection of the subsurface structure of the material, a new technique using a piezoelectric transducer (PZT) as a photoacoustic detector is presented and discussed. Aluminum foils with a groove under the surface were used as samples and the groove was detected by measuring the amplitude or the phase angle of the photoacoustic signal. By the use of a relatively high modulation frequency, a new elastic image as well as thermal image have been obtained.Keywords
This publication has 5 references indexed in Scilit:
- High-resolution photoacoustic thermal-wave microscopyApplied Physics Letters, 1980
- Optoacoustic phase angle measurement for probing a metalApplied Physics Letters, 1979
- Surface and subsurface structure of solids by laser photoacoustic spectroscopyApplied Physics Letters, 1978
- 20-MHz acoustic waves from pulsed thermoelastic expansions of constrained surfacesApplied Physics Letters, 1977
- Theory of the photoacoustic effect with solidsJournal of Applied Physics, 1976