Method and device for measuring the acoustic parameters of the birefringence of a material by measurement of time.

摘要

The invention relates to a method and a device for determining the parameters of the acoustic birefringence thetai and i of a blade which is locally parallel of determined thickness e. / p & & p & an acoustic wave polarized rectilinearly, is generated according to a reference direction oxi, oyi and directed towards the inlet face of a blade the. The pulses of echoes generated by the incident pulses in the reference directions mentioned above are detected and measured with respect to a reference instant. The operation is repeated for at least a second reference direction that is distinct from the first and the set of operations is repeated for a plurality of distinct values of the frequency of the acoustic wave in order to obtain a set of values of delay time of the echoes generated. The parameters of the birefringence thetai and i are obtained by resolution of the combinations of the equations linking the parameters of the birefringence thetai and i, for various emission frequencies f k. / p & & p & application to the study of the materials.