Fig. 1. Uncooled long-wave infrared spectrometer. (a) Schematic; (b) structural diagram

Fig. 2. Schematic of radiation calibration using uncooled infrared spectrometer

Fig. 3. Photos of experimental setup for radiation calibration using uncooled infrared spectrometer

Fig. 4. Relations between radiances LS(Tb) of standard area-source blackbody and output gray values of system at different ambient temperatures

Fig. 5. Relations between radiances LS(Tb) of standard area-source blackbody and output gray values of system obtained by drift compensation at different ambient temperatures

Fig. 6. Errors between output gray values obtained by drift compensation at different ambient temperatures and theoretically calculated values at laboratory ambient temperature (25 ℃)