Issue
J. Phys. Colloques
Volume 48, Number C7, Décembre 1987
1st International Laser M2P Conference
Page(s) C7-533 - C7-535
DOI https://doi.org/10.1051/jphyscol:19877127
1st International Laser M2P Conference

J. Phys. Colloques 48 (1987) C7-533-C7-535

DOI: 10.1051/jphyscol:19877127

OPTICAL GENERATION OF ULTRASONIC WAVES BY THE TRANSIENT GRATING METHOD : APPLICATION TO ACOUSTIC PROPERTY MEASUREMENTS

R. CASALEGNO and M. PIERRE

Laboratoire de Spectrométrie Physique, associé au CNRS et Celphyra, Université Scientifique, Technologique et Médicale de Grenoble, BP 87, F-38402 Saint-Martin-d'Hères Cedex, France


Abstract
Efficient production of coherent phonons by spatially periodic impulsive heating is shown to be a very well established method and to give reliable measurements of strong acoustic attenuation. Special care is taken to eliminate size effects. The technique is applied to a polymer material undergoing a glass-rubber phase transition.