IEVref:845-24-072ID:
Language:enStatus: Standard
Term: transmittance optical density
Synonym1: optical density
Synonym2: transmittance density
[Admitted]
Synonym3: decadic absorbance
[Admitted]
Symbol: Dτ
Definition: logarithm to base 10 of the reciprocal of the transmittance, τ

Dτ = −log10τ

Note 1 to entry: The transmittance optical density has unit one.

Note 2 to entry: This entry was numbered 845-04-66 in IEC 60050-845:1987.


Publication date:2020-12
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