17-798

Napierian spectral absorbance (of a homogeneous non-diffusing layer) [An(λ); B(λ)]

natural (Napierian) logarithm of the reciprocal of the spectral internal transmittance, τi(λ)

        An(λ) = B(λ) = -ln τi(λ)

Unit: 1

Equivalent term: "Napierian spectral internal transmittance density"

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