Fig. 1. FTIR system

Fig. 2. Interferogram of CO

Fig. 3. Spectrum of CO

Fig. 4. Diagram of traditional data processing method

Fig. 5. Interferogram of ZPD position on left side of center of interference signal

Fig. 6. Interferogram of ZPD position on right side of center of interference signal

Fig. 7. Results of different data processing methods for the same group of interference signals with turbulent noise

Fig. 8. Comparison of spectra in 2100--2200 cm^-1 band

Fig. 9. Amplitude of frequency response of Hanning windows

Fig. 10. Flowchart of new data processing method

Fig. 11. Experimental system

Fig. 12. Spectrum of CO with concentration of 1%

Fig. 13. Spectrum of CO with concentration of 1% in 2240--2050 cm^-1 absorption band

Fig. 14. Spectrum of CO with concentration of 1% (with turbulent noise)

Fig. 15. Spectrum of CO in 2240--2050 cm^-1 absorption band

Fig. 16. Spectrum of interference signal obtained by new data processing method

Fig. 17. Spectrum of CO in 2240--2050 cm^-1 absorption band obtained by new method

Fig. 18. Spectrum of interference signal obtained by traditional data processing method

Fig. 19. Spectrum of CO in 2240-2050 cm^-1 absorption band obtained by traditional method

Fig. 20. Nonlinear fitting of 1% CO absorption line