Theory of the photoacoustic effect with solids
Abstract
When chopped light impinges on a solid in an enclosed cell, an acoustic signal is produced within the cell. This effect is the basis of a new spectroscopic technique for the study of solid and semisolid matter. A quantitative derivation is presented for the acoustic signal in a photoacoustic cell in terms of the optical, thermal, and geometric parameters of the system. The theory predicts the dependence of the signal on the absorption coefficient of the solid, thereby giving a theoretical foundation for the technique of photoacoustic spectroscopy. In particular, the theory accounts for the experimental observation that with this technique optical absorption spectra can be obtained for materials that are optically opaque.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- January 1976
- DOI:
- 10.1063/1.322296
- Bibcode:
- 1976JAP....47...64R
- Keywords:
-
- 78.20.Hp;
- 43.35.+d;
- 07.45.+r;
- Piezo- elasto- and acoustooptical effects;
- photoacoustic effects;
- Ultrasonics quantum acoustics and physical effects of sound