IEVref:845-24-008ID:
Language:enStatus: Standard
Term: directional emissivity
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Symbol: ε
ε(θ, φ)
Definition: quotient of the radiance of a thermal radiator in a given direction and the radiance of a Planckian radiator at the same temperature

Note 1 to entry: The symbols θ, φ are chosen here as an example of the angular coordinates defining the given direction.

Note 2 to entry: The directional emissivity has unit one.

Note 3 to entry: This entry was numbered 845-04-08 in IEC 60050-845:1987.


Publication date:2020-12
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