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Identification and correction of nonlinearity in constant voltage-biased infrared sensor detected signals

In mercury-cadmium-telluride (HgCdTe) photoconductive detectors, the recorded signal is usually a nonlinear function of the incident photon flux. This nonlinear behavior must be taken into account for interferometric data transformation process to avoid measurement errors of the incident light intensity. In this work, we investigate the effects of nonlinearity contributed by various factors especially the nonlinearity contributed by the illuminated and non-illuminated detector areas, which to our knowledge was not investigated earlier. The effects of wire resistance and detector preamplifier loading as well as the impact of off-centered detector illumination compared to the centered detector illumination on the nonlinearity are also investigated. Finally, it has been shown that the nonlinearity can be estimated by using a third-order polynomial. Computer simulation results are presented for a constant voltage biased HgCdTe detector to estimate the effect of nonlinearity.