Quantitative studies of thermally generated elastic waves in laser-irradiated metals
Abstract
Quantitative experimental measurements have been made in the study of thermoelastic generation of elastic waves in a metal by unfocused laser radiation. A calibrated wide-band detection system, incorporating a capacitance transducer, has enabled acoustic waveforms to be recorded with a minimum of distortion. From these measurements, a theoretical model has been developed. The transfer function of the metal block has been deconvoluted to give the acoustic source function, which was modeled as a rapidly expanding point volume of material. The thermoelastic source generated longitudinal (L) and (S) waves, but the latter predominated at the epicenter, where, in experiments presented here, both wave amplitudes L and S were proportional to the total absorbed energy in the laser pulse.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- December 1980
- DOI:
- 10.1063/1.327601
- Bibcode:
- 1980JAP....51.6210S
- Keywords:
-
- 62.30.+d;
- 42.60.Kg;
- 65.70.+y;
- 43.88.+q;
- Mechanical and elastic waves;
- vibrations