Cryogenic holographic distortion testing

David G. Michel

doi:10.1117/12.178592

23 June 1994 Cryogenic holographic distortion testing

David G. Michel

Proceedings Volume 2227, Cryogenic Optical Systems and Instruments VI; (1994) https://doi.org/10.1117/12.178592
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

Abstract

Hughes cryogenic holographic test facility allows for the rapid characterization of optical components and mechanical structures at elevated and reduced temperatures. The facility consists of a 1.6 meter diameter thermal vacuum chamber, vibration isolated experiment test platform, and a holographic camera assembly. Temperatures as low as 12 Kelvin and as high as 350 Kelvin have been demonstrated. Complex aspheric mirrors are tested without the need for auxiliary null lenses and may be tested in either the polished or unpolished state. Structural elements such as optical benches, solar array panels, and spacecraft antennas have been tested. Types of materials tested include beryllium, silicon carbide, aluminum, graphite epoxy, silicon/aluminum matrix material and injection molded plastics. Sizes have ranged from 7 cm X 15 cm to 825 cm X 1125 cm and have weighed as little as 0.2 Kg and as much as 130 Kg. Surface figure changes as little as (lambda) /10 peak-to-valley ((lambda) equals .514 micrometers ) are routinely measured.

Citation Download Citation

David G. Michel "Cryogenic holographic distortion testing", Proc. SPIE 2227, Cryogenic Optical Systems and Instruments VI, (23 June 1994); https://doi.org/10.1117/12.178592

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