method and device for measuring the ultraschalldu00e4mpfung by laser ultrasonic nondestructive testing

摘要

Method of testing a part (16) by ultra sound laser in which; - a detection beam, sent by a laser pulse, is directed onto a measured zone (16a) of the part (18); - the laser pulse reflected by the part is detected during a set time period. The pulse includes Doppler (RTM) shifts generated by the ultra sound wave reflections on the measured zone, and; - each Doppler (RTM) shift is transformed into an intensity peak superposed onto the reflected pulse intensity. The intensity of each incident pulse of the laser detection beam is conditioned so as to produce a constant value of reflected pulse intensity during a period at least equal; to the measured time. each incident pulse is regulated so as to make the sensibly constant value invariable from one reflected pulse to the other. An Independent claim is included for an ultrasound testing installation.