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Proceedings Paper

Contamination Induced Degradation Of Optical Solar Reflectors In Geosynchronous Orbit
Author(s): Daryl L. Mossman; Hosea D. Bostic; Jesus R. Carlos
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Paper Abstract

Siloxane contaminated second-surface-mirrors were exposed to the geosynchronous solar environment and to laboratory irradiation designed to simulate the solar environment. Af-ter two an one-half years of space exposure, the solar absorptance (as) of the contami-nated (600Å) mirrors has almost tripled (Aas=0.145). Ge9synchron9us results show that doubling the siloxane film thickness from 300 angstrom (A) to 600Å produced as values greater by only 40%, suggesting that a major portion of the solar radiation is absorbed in the external 300Å thick layer. To compare with flight data and calibrate our production facility, samples were irradiated in 10-6 torr vacuum with 10 KEV electrons and radiation from two ultraviolet sources: a krypton lamp at 123.6nm, and a deuterium lamp at 180 - 450 nm. Accelerated lab results are similar to the on-orbit data, and verify that the geo-synchronous solar environment can be simulated for a given type and thickness of contaminant.

Paper Details

Date Published: 1 January 1987
PDF: 8 pages
Proc. SPIE 0777, Optical Systems Contamination: Effects, Measurement, Control, (1 January 1987); doi: 10.1117/12.967062
Show Author Affiliations
Daryl L. Mossman, Aerojet ElectroSystems Co. (United States)
Hosea D. Bostic, Aerojet ElectroSystems Co. (United States)
Jesus R. Carlos, Aerojet ElectroSystems Co. (United States)

Published in SPIE Proceedings Vol. 0777:
Optical Systems Contamination: Effects, Measurement, Control
A. Peter M. Glassford, Editor(s)

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