Abstract
The basic construction of thermal control mirrors, also known as Optical Solar Reflectors (OSRs) or Second Surface Mirrors (SSMs), consists of a thin glass substrate with a rear surface silver coating. It has a high total hemispherical emittance due to the glass, but a low solar absorptance from the highly transmitting glass and highly reflecting metallic surface. This paper will describe a new type of thermal control mirror, Controlled Optical Surface Film (COSF). Although the function of the COSF is the same as the conventional OSRs, the construction is different. The COSF consists of a polyimide film (UPILEX-S) for substrate and multi-layer coating on it. While the solar radiation is reflected on the rear surface silver coating in case of the OSRs, it will be reflected on the front surface multi-layer coating in case of the COSF. The preliminary design will be described and the preliminary test results of a comprehensive space qualification are also reported showing that the COSF is stable under high radiation fluence in space.
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