Holographic Interferometer Background Fringe Reduction by Dual Vacuum Application.

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Abstract:

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

Author(s):
Mcelwee, Daniel A.
Author Organization(s):
DARCOM INTERN TRAINING CENTER TEXARKANA TEX
Descriptive Note:
Final rept.,
Pagination:
0047

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
DARCOM-ITC-02-08-76-023
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*NONDESTRUCTIVE TESTING, *INTERFEROMETRY, *HOLOGRAPHY, STRESSES, PANELS, SHELTERS, VACUUM, DEFECTS(MATERIALS), SUBSURFACE, HONEYCOMB STRUCTURES
Field(s)/Group(s):
Test Facilities, Equipment and Methods, Optics
Keyword(s):
Holographic interferometry
Report Date:
1976 May 01