29 January 1992 Models of nonlinearities in focal plane arrays
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Proceedings Volume 2075, Passive Sensors; 207508 (1992) https://doi.org/10.1117/12.2300236
Event: Infrared Information Symposia, 1991, Ann Arbor, MI, United States
Abstract
Two-point calibration is often used to correct for nonuniformities across focal plane arrays (FPAs), as well as for calibration. Because the input-output curves of FPA channels are nonlinear, two-point calibration produces a systematic calibration error as a function of flux, and the channel-to-channel variations of this calibration error leave a significant post-correction nonuniformity. A physical model of detector nonlinearity is used to illustrate these points. A simple formula is proposed, which fits the input-output curves much better than the straight line used by two-point calibration, and is almost as easy to use. When the new formula is used, the system's performance is no longer sensitive to the choice of calibration temperatures, and no longer degrades rapidly outside the calibration interval.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James P. Karins, James P. Karins, } "Models of nonlinearities in focal plane arrays", Proc. SPIE 2075, Passive Sensors, 207508 (29 January 1992); doi: 10.1117/12.2300236; https://doi.org/10.1117/12.2300236
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