17-1214

spectral internal absorptance (of a homogeneous non-diffusing layer) [αi(λ)]

ratio of the spectral radiant flux absorbed between the internal entry and exit surfaces of the layer to the spectral flux that enters into the layer after crossing the entry surface

Unit: 1

NOTE For a given layer the spectral internal absorptance depends on the path length of the radiation in the layer, and hence, in particular, on the angle of incidence.

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