Abstract
The Scanning Laser Source (SLS) technique for the detection of sub-surface defects is presented. This approach monitors the changes in the time and frequency domain signals of laser generated ultrasound resulting from the changed conditions under which the ultrasound is generated over areas with and without defects. Results are presented for detection of small sub-surface defects using a fiberized laser based system. The SLS technique allows detection of subsurface defects smaller than the ultrasonic wavelength.
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