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Proceedings Paper

Thin film coatings with variable emittance
Author(s): Anna-Lena Larsson; Gunnar A. Niklasson; Lars Stenmark
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Paper Abstract

The temperature of a nanosatellite in orbit varies strongly as it goes into earth shadow or solar radiation. A variable emittance panel built with an electrochromic material, could improve the temperature control by providing an adaptive thermal control. The active function is due to an electrochromic layer, WO3, deposited by sputtering. Intercalation of Li+ leads to a change in the electron configuration, which modulates the radiation properties. Thin WO3 films were deposited onto Indium Tin Oxide (ITO) coated glass by reactive dc sputtering. IR measurements were done in a Perkin-Elmer 983 spectrophotometer. The IR emittance modulation, (Delta) (epsilon) of WO3 films, deposited on ITO coated glass, has been investigated. The emittance, (epsilon) , is computed from the reflectance, at 25 degrees C. Initial results show emittances in the range from 0.2 to 0.5 crystalline film has (Delta) (epsilon) equals 0.12, and the amorphous film has (Delta) (epsilon) equals 0.3. IR properties of WO3 need to be further investigated as well as the construction of a whole device.

Paper Details

Date Published: 7 September 1999
PDF: 7 pages
Proc. SPIE 3738, Advances in Optical Interference Coatings, (7 September 1999); doi: 10.1117/12.360119
Show Author Affiliations
Anna-Lena Larsson, Uppsala Univ. (Sweden)
Gunnar A. Niklasson, Uppsala Univ. (Sweden)
Lars Stenmark, Uppsala Univ. (Sweden)

Published in SPIE Proceedings Vol. 3738:
Advances in Optical Interference Coatings
Claude Amra; H. Angus Macleod, Editor(s)

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