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Correlation of Predicted and Observed Optical
Properties of Multi-Layer Thermal Control Coatings
Thermal control coatings on spacecraft will be increasingly important
as spacecraft grow smaller and more compact. New thermal control coatings
will be needed to meet the demanding requirements of next generation spacecraft.
Computer programs are now available to design optical coatings, and one such
program was used to design several thermal control coatings consisting of
alternating layers of WO3 and SiO2. The coatings were
subsequently manufactured with electron beam evaporation and characterized
with both optical and thermal techniques. Optical data were collected in
both the visible region of the spectrum and the infrared. Solar absorptance
values were predicted in the range of 0.177-0.196 and were observed in the
range of 0.155-0.228. Infrared emittance values were predicted in the range
of 0.074-0.083 and were observed optically in the range 0.048-0.093 and calorimetrically
in the range of 0.069-0.100. |
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