cie

e-ILV

The e-ILV provides free access to all the terms and definitions contained in the international standard CIE S 017:2020 ILV: International Lighting Vocabulary, 2nd edition.

To search for another term please use  "Back to the list" to return to the main page or the e-ILV.

For the complete set of terms and definitions CIE S 017:2020 can be purchased from the CIE Webshop. Members of a CIE National Committee or Associate National Committee have access to a 66,7 % discount on the purchase price of the standard.

For advice on CIE Publications contact helpdesk@cie.co.at. Note the CIE Helpdesk cannot assist with technical enquiries.

17-24-095

spectral absorptivity, <of an absorbing material>

αi,o(λ)

spectral internal absorptance of a layer of an absorbing material such that the path of the radiation is of dimension length, and under conditions in which the boundary of the material has no influence

Note 1 to entry: to entry: The unit of the quantity length has to be specified. If a new unit of length is used that is k times the magnitude of the original one, then the value of will change to .

Note 2 to entry: The spectral absorptivity has unit one.

Note 3 to entry: This entry was numbered 845-04-88 in IEC 60050-845:1987.

Note 4 to entry: This entry was numbered 17-1209 in CIE S 017:2011.

Publication date: 2020-12
Copyright © CIE 2020. All Rights Reserverd.