LASER-ULTRASONIC TESTING SYSTEM

摘要

In a method for ultrasonic testing of objects, ultrasound is generated insid e or at the surface of the object. The surface of the object is illuminated wi th a beam from a long-pulse laser oscillator, typically in the range 1 .mu.s to a few 100 .mu.s, that is substantially free of intensity fluctuations. The lig ht from the incident beam that is scattered or reflected by the surface of the object is collected and demodulated to obtain a signal representative of the ultrasonic motion. The method allows for the use of a compact and efficient arrangement.