Holographic Interferometer Background Fringe Reduction by Dual Vacuum Application.
DARCOM INTERN TRAINING CENTER TEXARKANA TEX
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This report evaluates performance capabilities of a modified holographic nondestructive testing system. Specifically, the problem considered is that of reducing the obscuring background contour pattern which occurs when a vacuum stress is applied to honeycomb shelter panels undergoing holographic inspection for subsurface defects. Rather than optically masking the interference fringes, application of a compensating vacuum is investigated. The report also examines optimal photographic exposure and development times to obtain clearest test results with the holographic interferometer. Author
- Test Facilities, Equipment and Methods