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).
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