Abstract
The imager of the infrared satellite ISO will allow spectral imaging under very low flux conditions in the two to-eighteen-microns range, close to the fundamental limit of the zodiacal background photon noise. To optimize the performance of the imager, we must use an internal calibration device, mainly to track changes in the responsivity of the pixels of the detectors arrays, the limit of detection greatly depending upon the quality of the flat field corrections in certain cases.
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