Nonuniformity correction is the key issue for the image quality improvement of infrared focal panel arrays imaging.But the nonuniformity correction precision is difficult to improve based on existing monadic linear theoretical model.Infrared focal panel array photoelectric response mechanism and its imaging process were analyzed.The main influence factors for infrared sensor response and its nonuniformity were deduced.A binary nonlinear nonuniformity theoretical model for infrared imaging was present for the first time.Experimental test results were given.Test and statistic analysis results show that the model give reasonable prediction of the responsive curve for infrared focal panel arrays sensor in wider infrared scene radiation and surrounding temperature range.Furthermore

this model reveals comprehensive influence factors of IRFPA response and nonuniformity differ from the existing monadic linear theoretical model.