Abstract

For the purpose of calibrating instruments carried on meteorological satellites, a stable diffusing surface is required to direct the sun’s rays into the optical path. The bidirectional reflectance properties of six materials have been studied with a goniophotometer. It was found that pressed magnesium oxide exhibits the best diffusing properties, especially at a viewing angle of 40°; it was tested further and found to possess the necessary mechanical properties to survive launching conditions.

© 1968 Optical Society of America

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