Infrared hyperspectral imaging passive telemetry system is applied to chemical gas monitoring. Noise equivalent radiation brightness (NESR) is an important index to characterize the sensitivity of the system. Firstly, the theory of Noise Equivalent Spectral Radiance (NESR) of passive infrared telemetry system is introduced. Based on infrared radiation transmission theory and simple three-layer model, the noise equivalent radiation brightness (NESR) of infrared hyperspectral imaging system under area array detector is deduced. Three calculation methods of NESR are introduced. The principle experimental device of long-wave infrared hyperspectral imaging spectrometer (CHIPED-1) developed by ourselves is used to validate the method. The NESR distribution at 10μm is obtained by calculating the measured data, which is helpful to the photoelectric sensitivity study of infrared hyperspectral imaging system under area array detection.
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