Accession Number:

ADA024741

Title:

Holographic Interferometer Background Fringe Reduction by Dual Vacuum Application.

Descriptive Note:

Final rept.,

Corporate Author:

DARCOM INTERN TRAINING CENTER TEXARKANA TEX

Personal Author(s):

Report Date:

1976-05-01

Pagination or Media Count:

47.0

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

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE