Abstract

Specular reflectance measurements were made on a black paint used in a solar constant monitoring cavity radiometer. Interference filters peaking at 180, 200, and 220 nm were used in conjunction with a deuterium lamp source and a silicon photodiode detector. Results showed that the black paint was specular for light incident 60° from normal and it reflected ~8% of the light at these wavelengths. We conclude that the high absorptance of the radiometer calculated for visible wavelengths should remain valid down to ~190-nm UV wavelengths.

© 1982 Optical Society of America

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