spectral internal transmittance (of a homogeneous non-diffusing layer) [τi(λ)]

ratio of the spectral radiant flux reaching the exit internal surface 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 transmittance depends on the path length of the radiation in the layer, and hence, in particular, on the angle of incidence.

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