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Proceedings Paper

Vacuum BRDF Measurements Of Cryogenic Optical Surfaces
Author(s): Timothy L. Howard; Patricia M. George; Steve Flammang; Daryl Mossman
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Paper Abstract

Spaceborne optical systems designed for long-duration missions are susceptible to degradation from contaminants in the spacecraft environment. In order to assess contamination build-up rates and corresponding scatter changes, we have designed a BRDF measurement system for use in a high-vacuum (10-8 Torr), low-temperature (20K) environment. The system measures cryocooled optics at angles from near-specular (< 1°) to approximately 30° off-axis, at wavelengths of 0.633 and 10.6 microns. We describe the design characteristics of the instrument, and discuss preliminary experiments which demonstrate contamination build-up correlated with changes in the sample BRDF profiles. The current status of the instrument is reviewed and future plans and applications summarized.

Paper Details

Date Published: 2 January 1990
PDF: 10 pages
Proc. SPIE 1165, Scatter from Optical Components, (2 January 1990); doi: 10.1117/12.962863
Show Author Affiliations
Timothy L. Howard, GenCorp Aerojet ElectroSystems (United States)
Patricia M. George, GenCorp Aerojet ElectroSystems (United States)
Steve Flammang, GenCorp Aerojet ElectroSystems (United States)
Daryl Mossman, GenCorp Aerojet ElectroSystems (United States)

Published in SPIE Proceedings Vol. 1165:
Scatter from Optical Components
John C. Stover, Editor(s)

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