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photometry
irradiance in the image space of an optical system


gain in irradiance of a surface in the focal plane of an optical system illuminated by a source at infinity vs direct illumination


Caution
Fill in all cells except one.
Choose all parameters unit.
The illuminated surface is supposed to be perpendicular to the optical axis and its dimensions as well as the aperture are assumed to be small regarding fi.
All parameters are positive.

ParameterValueunit
teta
N
T
G
gain in irradiance of a surface in the focal plane of an optical system illuminated by a source at infinity vs direct illumination
teta : angular size of the light source N : aperture number of the optical system T : transmission of the optical system G : gain in illuminance (ratio of the illuminance through the optical system over the irradiance produced by direct illumination)

Note
This calculation page can not detect all unrealistic inputs.



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