27 October 1998 Backscatter ultraviolet instrument solar diffuser degradation
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All but one of the backscatter UV (BUV) instruments have used solar reflective diffusers made of ground aluminum to maintain instrument calibration after launch. These diffusers have been sued throughout mission life-times, which range from less than 1 years to over 14 years. Means for monitoring diffuser reflectance include mechanisms on the instruments as well as methods to infer reflectance using earth radiance data. We compare changes in diffuser reflectance for the various instruments and find some common behavior as well as significant differences. Changes which appear to occur at different rates are actually quite similar when corrections are made for the amount and direction of incident solar irradiation. However, a class of instruments, the SBUV/2, has significantly lower degradation rates. We find, as have previous authors, that spacecraft self-contamination is the most likely cause of diffuser changes and observed differences. Observed changes suggest that contaminant layer thickness is the main reflectance degradation mechanism in the first few years of operation.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Glen Jaross, Glen Jaross, Richard P. Cebula, Richard P. Cebula, Matthew DeLand, Matthew DeLand, K. Steinfeld, K. Steinfeld, Richard D. McPeters, Richard D. McPeters, Ernest Hilsenrath, Ernest Hilsenrath, Arlin J. Krueger, Arlin J. Krueger, "Backscatter ultraviolet instrument solar diffuser degradation", Proc. SPIE 3427, Optical Systems Contamination and Degradation, (27 October 1998); doi: 10.1117/12.328514; https://doi.org/10.1117/12.328514

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