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Area Lighting / Lighting technology and daylighting

IEV ref 845-29-106

Symbol
δ(ε)

en
optical thickness, <of the atmosphere>
optical depth, <of the atmosphere>

δ(ε)=ln Φ e Φ e MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai abes7aKjaacIcacqaH1oqzcaGGPaGaeyypa0JaeyOeI0IaciiBaiaa c6gadaWcaaqaaiqbfA6agzaafaWaaSbaaSqaaiaabwgaaeqaaaGcba GaeuOPdy0aaSbaaSqaaiaabwgaaeqaaaaaaaa@44D7@

where Φe is the radiant flux of a collimated beam entering the upper limit layers of the atmosphere at an angle ε to the vertical, and Φ e MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai qbfA6agzaafaWaaSbaaSqaaiaabwgaaeqaaaaa@39B4@ is the attenuated radiant flux of that beam reaching the surface of the Earth

Note 1 to entry: See also "spectral optical thickness".

Note 2 to entry: The optical thickness has unit one.

Note 3 to entry: This entry was numbered 845-09-86 in IEC 60050-845:1987.


fr
épaisseur optique, <de l'atmosphère> f
δ(ε)=ln Φ e Φ e MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai abes7aKjaacIcacqaH1oqzcaGGPaGaeyypa0JaeyOeI0IaciiBaiaa c6gadaWcaaqaaiqbfA6agzaafaWaaSbaaSqaaiaabwgaaeqaaaGcba GaeuOPdy0aaSbaaSqaaiaabwgaaeqaaaaaaaa@44D7@

Φe est le flux énergétique d'un faisceau collimaté entrant dans les couches de la limite supérieure de l'atmosphère sous un angle ε avec la verticale, et Φ e MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai qbfA6agzaafaWaaSbaaSqaaiaabwgaaeqaaaaa@39B4@ est le flux énergétique atténué de ce faisceau à son arrivée à la surface de la Terre

Note 1 à l'article: Voir aussi "épaisseur optique spectrale".

Note 2 à l'article: L'unité d'épaisseur optique est un.

Note 3 à l'article: Cet article était numéroté 845-09-86 dans l'IEC 60050-845:1987.


ar
السمك البصري, <الغلاف الجوي>
العمق البصري

de
optische Dicke, <der Atmosphäre> f

it
spessore ottico, <dell'atmosfera>
profondità ottica, <dell'atmosfera>

ko
대기 광학두께, <대기>

ja
大気の光学的厚さ

pl
gęstość optyczna, <atmosfery> f

pt
espessura óptica, <da atmosfera>

zh
光厚度, <大气层的>

Publication date: 2020-12
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