Holographic Interferometer Background Fringe Reduction by Dual Vacuum Application.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1976
- Accession Number
- ADA024741
Entities
People
- Daniel A. Mcelwee