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23 January 2003 Maintaining uniformity of IR focal plane arrays by updating offset correction coefficients
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An infrared focal plane array (FPA) non-uniformity correction (NUC) method is considered, in which two-point calibration (TPC) table is calculated and stored at the factory, and the offset correction is carried out periodically during the mission. An InSb FPA is examined, and the stability of the NUC is measured over various periods (up to 9 months) and also under variations of the FPA temperature and integration time. We find that the NUC quality and its stability comply with the system requirements. We find, also, that the stability of the NUC is better maintained by using a single TPC table for the entire detector dynamic range, as compared to the multiple (piece-wise-linear) TPC. A simple phenomenological model of the detector non-linearity is proposed, which fits the experimental data better than the quadratic non-linearity model.
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Evgeni Gurevich and Asa Fein "Maintaining uniformity of IR focal plane arrays by updating offset correction coefficients", Proc. SPIE 4820, Infrared Technology and Applications XXVIII, (23 January 2003);

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