IEVref:845-21-055ID:
Language:enStatus: Standard
Term: cylindrical irradiance
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Symbol: Ee,c
Ec
Definition: mean value of 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: Cylindrical irradiance is sometimes also defined as arithmetic mean of the vertical irradiance Ee,v at a point

E e,c = 1 2π 0 2π E e,v dφ MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai aadweadaWgaaWcbaGaaeyzaiaabYcacaqGJbaabeaakiabg2da9maa laaabaGaaGymaaqaaiaaikdaimaacqWFapaCaaWaa8qCaeaacaWGfb WaaSbaaSqaaiaabwgacaqGSaGaaeODaaqabaaabaGaaGimaaqaaiaa ikdacqWFapaCa0Gaey4kIipakiaabsgacqaHgpGAaaa@4AA7@

where Ee,v is the vertical 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 photometric quantity is "cylindrical illuminance". The corresponding quantity for photons is "photon cylindrical irradiance".

Note 3 to entry: The cylindrical irradiance is expressed in watt per square metre (W·m−2).

Note 4 to entry: This entry was numbered 845-01-41 in IEC 60050-845:1987.


Publication date:2020-12
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