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.

17-29-107

Linke turbidity factor

total turbidity factor

TL

quotient of the vertical optical thickness of a turbid atmosphere and the vertical optical thickness of the pure and dry atmosphere (Rayleigh atmosphere), related to the whole solar spectrum

Note 1 to entry: The total turbidity factor can be expressed by
TL = (δR + δA + δZ + δW) / δR

where δR is the optical thickness with respect to Rayleigh scattering at the air molecules, and δA, δZ, δW are the optical thicknesses with respect to Mie scattering and absorption at the aerosol particles, to ozone absorption, and to water vapour absorption respectively.

Note 2 to entry: The total turbidity factor has unit one.

Note 3 to entry: This entry was numbered 845-09-87 in IEC 60050-845:1987.

Note 4 to entry: This entry was numbered 17-1324 in CIE S 017:2011.

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