Abstract Cermet films of gold and aluminum oxide were sputter deposited onto silicon substrates. These films consisted of nanometer-sized gold grains embedded in a matrix of aluminum oxide, andwere designed to maximally absorb visible radiation and minimally emit infrared radiation. Ex situ and in-situ spectroscopic ellipsometry were used to characterize film optical constants from vacuum ultraviolet to middle infrared. The optical constants, for cermet films with gold volume fractions ranging from 0 to 1, were used in predictive optical models. Thermal performance was optimized using a new algorithm based on energy balances. This algorithm weights the parameter fit in predictive optical models to an ideal reflectance spectrum. This weighting factor emphasizes fitting in more significant spectral ranges and deemphasizes fitting in less significant wavelength ranges. Absorptivity, emissivity, and their ratio were calculated for optimized film structures.
CERMET THERMAL CONVERSION COATINGS FOR SPACE APPLICATIONS
2006-01-01
12 pages
Article/Chapter (Book)
Electronic Resource
English
Cermet Thermal Conversion Coatings for Space Applications
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