Patent ID: 6490047
Filing Date: 2002-12-03
Classification: G01H,G01N,G10K

Abstract:
A laser ultrasonic system for evaluating a bond between an element and a substrate, comprising:Pulse application means including a collimated light source for transmitting a pulse of light along an optical path to a target point on a substrate; Firing detection means in said optical path for detecting the passage of said pulse of light along said optical path and providing an output signal indicating the presence of the pulse; Monitoring means for detecting the propagation of vibrations in said substrate, and collecting for analysis a vibration signature reflecting said propagation of said vibrations; Synchronization control means connected to said pulse application means and said firing detection means for selectively actuating said pulse application means to provide a light pulse to said target point, monitoring said firing detection means to determine the timing of said pulse transmission, and in response thereto, activating said monitoring means to collect a pertinent part of said vibration signature relative to said timing of said pulse transmission.