# 17-24-085

spectral linear absorption coefficient

a(λ)

relative decrease in radiant flux caused by absorption, expressed by the relative density of the spectral radiant flux, Φe,λ(λ), with respect to propagation length, l, of a collimated beam at a point in an absorbing medium

Note 1 to entry: The spectral linear absorption coefficient is expressed in metre to the power minus one (m−1).

Note 2 to entry: This entry was numbered 845-04-78 in IEC 60050-845:1987.

Note 3 to entry: This entry was numbered 17-1219 in CIE S 017:2011.

Publication date: 2020-12