EVALUATION OF A METAL LAMELLAR GRATING FOR THE AEROSPACE INTERFEROMETER.
Abstract
In the 6-month period between September 1967 and March 1968 the sensitivity of the lamellar grating interferometer deteriorated significantly in the short wavelength region (<80 micrometer). The cause of the degradation in performance was traced to a deterioration of the optical quality of the stationary element of the pyrex glass lamellar grating. A prototype metal lamellar grating has been designed and fabricated. It was monitored for stability over a 45-day period. It is concluded that the improved design and less fragile nature of a metal lamellar grating compared to a glass one leads to a more stable grating. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 15, 1969
- Accession Number
- AD0693128
Entities
People
- Charles M. Randall
- Jerome M. Dowling
- Thomas E. Mott
Organizations
- The Aerospace Corporation