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.
Laser Shearography Reveals Hidden "Unbonds"
NASA Tech Briefs ; 16 , 10
1992-10-01
Miscellaneous
No indication
English
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