IEVref:845-21-046ID:
Language:enStatus: Standard
Term: photon intensity
Synonym1:
Synonym2:
Synonym3:
Symbol: Ip
I
Definition: density of photon flux with respect to solid angle in a specified direction

I p = d Φ p dΩ MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaiqaciWacmGadaGadeaabaGaaqaaaOqaaiaadMeadaWgaaWcbaGaaeiCaaqabaGccqGH9aqpdaWcaaqaaiaabsgacqqHMoGrdaWgaaWcbaGaaeiCaaqabaaakeaacaqGKbGaeuyQdCfaaaaa@3E5C@

where Φp is the photon flux emitted in the given direction, and Ω is the solid angle containing that direction

Note 1 to entry: The distribution of the photon intensities as a function of the direction of emission, e.g. given by the polar angles (ϑ, φ), is used to determine the photon flux, Φp, within a certain solid angle, Ω, of a source:

Φ p = Ω I p ( ϑ,φ )sinϑ dφ dϑ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai abfA6agnaaBaaaleaacaqGWbaabeaakiabg2da9maapifabaGaamys amaaBaaaleaacaqGWbaabeaakmaabmaabaGaeqy0dOKaaiilaiabeA 8aQbGaayjkaiaawMcaaiaabohacaqGPbGaaeOBaiabeg9akjaabcca caqGKbGaeqOXdOMaaeiiaiaabsgacqaHrpGsaSqaaiabfM6axbqab0 Gaey4kIiVaey4kIipaaaa@52EF@ .

Note 2 to entry: The corresponding radiometric quantity is "radiant intensity". The corresponding photometric quantity is "luminous intensity".

Note 3 to entry: The photon intensity is expressed in second to the power minus one times steradian to the power minus one (s−1·sr−1).

Note 4 to entry: This entry was numbered 845-01-32 in IEC 60050-845:1987.


Publication date:2020-12
Source
Replaces:
Internal notes:
CO remarks:
TC/SC remarks:
VT remarks:
Domain1:
Domain2:
Domain3:
Domain4:
Domain5: