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Nonlinearity and nonuniformity corrections for the IRIS family of IRCCD thermal imagers

New generation IRCCD focal plane arrays have pixel noise levels near BLIP performance. However, nonuniformities, nonlinearities, and 1/f noise can be limiting factors that affect the final performance of the system. The spatial noise introduced by these phenomena can be several tens of times greater than the temporal noise. Depending on the applications, the requirement to reduce the spatial noise below the temporal noise is always the same, but the dynamic range required by the system can lead to the selection of different means of nonuniformity correction. In the first section of this paper, we analyze the measurements of detectivities, nonlinearities, and 1/f noise for typical linear arrays of 288 X 4 elements used in the IRIS thermal imagers family. In the last section, results are presented about nonuniformity corrections, 1/f noise reduction by continuous updating of correction coefficients, two-point dynamic correction, nonlinear correction, and scene-based correction.