IEVref:845-21-069ID:
Language:enStatus: Standard
Term: photon cylindrical irradiance
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Symbol: Ep,c
Ec
Definition: mean value of photon irradiance on the outer curved surface of a very small (real or imaginary) cylinder that is oriented vertically at a point in space

Note 1 to entry: Photon cylindrical irradiance is sometimes also defined as the arithmetic mean of the vertical photon irradiance, Ep,v, at a point

E p,c = 1 2π 0 2π E p,v dφ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai aadweadaWgaaWcbaGaaeiCaiaabYcacaqGJbaabeaakiabg2da9maa laaabaGaaGymaaqaaiaabkdaimaacqWFapaCaaWaa8qCaeaacaWGfb WaaSbaaSqaaiaabchacaqGSaGaaeODaaqabaGccaGGKbGaeqOXdOga leaacaaIWaaabaGaaGOmaiab=b8aWbqdcqGHRiI8aaaa@4AC1@

where Ep,v is the vertical photon irradiance for an area element with its normal in the direction φ, and φ is the angle in the plane perpendicular to the axis of the cylinder.

Note 2 to entry: The corresponding radiometric quantity is "cylindrical irradiance". The corresponding photometric quantity is "cylindrical illuminance".

Note 3 to entry: The photon cylindrical irradiance is expressed in second to the power minus one per square metre (s−1·m−2).


Publication date:2020-12
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