Irradiance Calculator

Irradiance, which is defined as the radiant flux received at a surface per unit area, can be calculated for a given spectral range and system optics. For a given detector pitch, the number of received photons incident on the pixel surface can also be determined for a given luminous efficacy in the reflective band (e.g. Visible, NIR, SWIR) or object temperature in the emissive band (e.g. MWIR, LWIR, VLWIR).

Transmission Coefficient ( ηatm ):
Low Cutoff Wavelength ( λL ): µm
High Cutoff Wavelength ( λC ): µm
Scene Temperature ( K ):
f-number ( f / # ):
Pixel Pitch ( µm ):
Irradiance( Ee ) :

$$M_e(T) = \int_{\lambda _L}^{\lambda _C}\frac{2\pi hc^2}{\lambda ^5 [e^{\frac{hc}{\lambda kT}}-1]}$$
Photon Irradiance ( Eq ) :

$$E = \frac{M}{4(F/\#)^2 + 1}$$
Number of Photons Per Second:

Transmission Coefficient ( ηatm ):
Low Cutoff Wavelength ( λL ): µm
High Cutoff Wavelength ( λC ): µm
Illuminance ( lx ):
f / # :
Pixel Pitch ( µm ):
Irradiance( Ee ) :

$$M_e(T) = \int_{\lambda _L}^{\lambda _C}\frac{2\pi hc^2}{\lambda ^5 [e^{\frac{hc}{\lambda kT}}-1]}$$
Photon Irradiance ( Eq ) :

$$E = \frac{M}{4(F/\#)^2 + 1}$$
Number of Photons Per Second:

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