Abstract
Over a radiance range such as that of terrestrial features observed in the 8–13 μm spectral region from orbital altitudes the voltage response of a photoconductive HgCdTe detector can be described accurately as a quadratic function of scene radiance. The three coefficients of the quadratic calibration equation can be determined by only two scene reference temperatures. This is possible because the quadratic and linear coefficients are functionally related. For spacecraft instruments a two-point calibration is very convenient since the on-board blackbody (at ambient temperature) and cold space are usually the only reference sources available.
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