Fig. 1. Structure diagram of cryogenic spectrometer

Fig. 2. Structure of infrared spectrometer in the cryogenic cavity

Fig. 3. Spectral resolution test results of airborne thermal infrared hyperspectral imager (ATHIS)

Fig. 4. Testing scene of absolute spectral location correction method based on CO₂ laser

Fig. 5. Absolute spectral location transfer method based on CO₂ laser

Fig. 6. Signal curve obtained from monochromator by scanning the R16 line (10 274 nm) of CO₂ laser

Fig. 7. Signal curve obtained from monochromator by scanning the P14 line (10 532 nm) of CO₂ laser

Fig. 8. Signal curve obtained from monochromator by scanning the R14 line (10 289 nm) of CO₂ laser

Fig. 9. Signal curve obtained from monochromator by scanning the P18 line (10 571 nm) of CO₂ laser

Fig. 10. Absolute position correspond curve of the monochromator after fitting

Fig. 11. Measurement site for infrared absorption spectra of ammonia

Fig. 12. Ammonia infrared absorption spectrum measured by the ATHIS

Fig. 13. Identification of material properties on top of urban buildings by the ATHIS (Zhoushan, Zhejiang, China)

Fig. 14. Detection results of factory emission from different spectral hyperspectral data (Dongfang, Hainan, China)