Vacuum BRDF Measurements Of Cryogenic Optical Surfaces

Timothy L. Howard; Patricia M. George; Steve Flammang; Daryl Mossman

doi:10.1117/12.962863

2 January 1990 Vacuum BRDF Measurements Of Cryogenic Optical Surfaces

Timothy L. Howard, Patricia M. George, Steve Flammang, Daryl Mossman

Proceedings Volume 1165, Scatter from Optical Components; (1990) https://doi.org/10.1117/12.962863
Event: 33rd Annual Technical Symposium, 1989, San Diego, United States

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.

Citation Download Citation

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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