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photometry
irradiance in the image space of an optical system


irradiance of a screen by a small source with a given radiance and located at the focal point of an optical system


Caution
Fill in all input cells.
Choose all parameters unit.
The light source and D are supposed to be small compared to fi and z.
The screen is supposed to be perpendicular to the optical axis.
All parameters are positive.

InputValueunit
L
D
T
z
OutputValueUnit
Eto be calculated
irradiance of a screen by a small source with a given radiance and located at the focal point of an optical system
L : luminance of the light source D : aperture diameter of the optical system T : transmission of the optical system z : distance from the secondary principal plane of the optical system to the screen E : irradiance in the illuminated part of the screen

Note
This calculation page can not detect all unrealistic inputs.



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