Analysis and calculation of the nonlinear response in infrared focal planearrays

Various factors contributing to the nonlinearity response in infrared focal plane array (IRFPA) were analyzed. Then based on the dependence of quantum efficiency on the wavelength of incident photon flux, the global nonlinear ity in the response of HgCdTe IRFPA was calculated under quasi-ideal condit ions. In consideration of nonuniformity correction, the nonlinearity in the calibrated interval was further calculated. At last, a practical case of r esidual nonuniformity error attribued to the nonuniformity of response nonl inearity was introduced and interpreted.