NASA NTRS · 19920000644
Laser Shearography Reveals Hidden "Unbonds"
Abstract
Flaws identified faster than in ultrasonic inspection. Holographic technique detects hidden "unbonds", and does not require elaborate provisions for suppression of vibrations. Laser-shearographic apparatus used to observe object while stress being applied. Shearographic image indicative of deflection caused by stress. Also used to inspect complexly contoured surfaces.
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Schaefer, Lloyd A.. 1992-10-01. Laser Shearography Reveals Hidden "Unbonds". https://ntrs.nasa.gov/citations/19920000644
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