IEVref:845-04-08ID:
Language:enStatus: Obsolete
Term: directional emissivity (of a thermal radiator, in a given direction)
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Symbol: ε
ε (θ,φ )
Definition: ratio of the radiance of the radiator in the given direction to that of a Planckian radiator at the same temperature

NOTE – The symbols θ,φ are chosen here as an example of the angular coordinates defining the given direction.


Publication date:1987
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