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photometry
irradiance in the image space of an optical system


irradiance of a screen conjugated of a small light source by a slightly opened optical system


Caution
Fill in all input cells.
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 the absolute value of x.
Except x which is negative, all parameters are positive.
Positive direction is according the horizontal arrow in the bottom right of the scheme.

InputValueunit
L
D
fi
T
x
OutputValueUnit
Eto be calculated
irradiance of a screen conjugated of a small light source by a slightly opened optical system
L : radiance of the light source D : aperture diameter of the optical system fi : effective focal length of the optical system T : transmission ratio of the optical system x : distance from the primary principal plane of the optical system to the light source E : irradiance in the illuminated part of the screen

Note
This calculation page can not detect all unrealistic inputs.



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