Pages 371-372
A pulse laser has been used to generate ultrasonic transients in samples of the laser ultrasonic nondestructive inspection. However, it is impossible to excite ultrasonic wave in transparent materials by a pulse laser. In this study, the surface of a transparent ceramic specimen is painted black in order to absorb the laser energy. As a result, heating by pulse laser, the specimen with a black surface band makes the pulse wave. By using the pulse wave, the sound speeds in a transparent ceramic specimen are measured. The experimental results were identical with the results by the ultrasonic pulse method.
