IEVref:845-04-70ID:
Language:enStatus: Obsolete
Term: radiance coefficient (at a surface element of a medium, in a given direction, under specified conditions of irradiation)
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Symbol: qe
q
Definition: quotient of the radiance of the surface element in the given direction by the irradiance on the medium

unit : sr -1

NOTE – In the USA the concept bi-directional reflectance distribution function (BRDF) is similar to the above coefficient except that it is defined for directional incident radiation.


Publication date:1987
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