IEVref:845-24-092ID:
Language:enStatus: Standard
Term: Napierian spectral absorption coefficient, <of a homogeneous non-diffusing layer>
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Symbol: an(λ)
Definition: quotient of the natural (Napierian) logarithm of the reciprocal of the spectral internal transmittance, τi(λ), of a layer of the medium and the length, l, of the path of a beam of radiation traversing that layer

a n (λ)=− ln τ i (λ) l = log τ i (λ) l ln(10)= A n (λ) l MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai aadggadaWgaaWcbaGaaeOBaaqabaGccaGGOaGaeq4UdWMaaiykaiab g2da9iabgkHiTmaalaaabaqcaaKaciiBaiaac6gakiabes8a0naaBa aaleaacaqGPbaabeaakiaacIcacqaH7oaBcaGGPaaabaGaamiBaaaa cqGH9aqpdaWcaaqaaKaaajGacYgacaGGVbGaai4zaOGaeqiXdq3aaS baaSqaaiaabMgaaeqaaOGaaiikaiabeU7aSjaacMcaaeaacaWGSbaa aKaaajaabYgacaqGUbGaaeikaiaabgdacaqGWaGaaeykaOGaeyypa0 ZaaSaaaeaacaWGbbWaaSbaaSqaaiaab6gaaeqaaOGaaiikaiabeU7a SjaacMcaaeaacaWGSbaaaaaa@5E62@

where An(λ) is Napierian spectral absorbance.

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

Note 2 to entry: This entry was numbered 845-04-85 in IEC 60050-845:1987.


Publication date:2020-12
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