Proceedings PaperBrdf Measurement Equipment: Intrinsic Design Considerations
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BRDF (bidirectional reflectance distribution function) is the accepted expression for describing directional reflectance. BRDF is the ratio of outgoing radiance (watts per square centimeter per sterradian) in one direction divided by incoming irradiance (watts per square centimeter) from another direction, and the units of BRDF are sterradians to the minus one power. BRDF is an unusual scientific quantity, and it is not simple to visualize, to measure or to use. Its unusual character gives rise to certain intrinsic considerations for measurement equipment, and this paper addresses those intrinsic design considerations.