Paper
2 January 1990 Vacuum BRDF Measurements Of Cryogenic Optical Surfaces
Timothy L. Howard, Patricia M. George, Steve Flammang, Daryl Mossman
Author Affiliations +
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.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Timothy L. Howard, Patricia M. George, Steve Flammang, and Daryl Mossman "Vacuum BRDF Measurements Of Cryogenic Optical Surfaces", Proc. SPIE 1165, Scatter from Optical Components, (2 January 1990); https://doi.org/10.1117/12.962863
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Cited by 1 scholarly publication.
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KEYWORDS
Bidirectional reflectance transmission function

Contamination

Telescopes

Mirrors

Sensors

Optical components

Aluminum

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