IEVref:845-24-078ID:
Language:enStatus: Standard
Term: radiance coefficient
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Symbol: qe
q
Definition: quotient of the radiance at a surface element of a medium in a given direction and the irradiance on the medium

q e = L e E e MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai aadghadaWgaaWcbaGaaeyzaaqabaGccqGH9aqpdaWcaaqaaiaadYea daWgaaWcbaGaaeyzaaqabaaakeaacaWGfbWaaSbaaSqaaiaabwgaae qaaaaaaaa@3E11@

where Le is radiance and Ee is irradiance

Note 1 to entry: The bi-directional reflectance distribution function (BRDF) is similar to the radiance coefficient except that it is defined for directional incident radiation.

Note 2 to entry: The radiance coefficient is expressed in steradian to the power minus one (sr−1).

Note 3 to entry: This entry was numbered 845-04-70 in IEC 60050-845:1987.


Publication date:2020-12
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