Fig. 1. Spectra recovered from interferograms with different orders. (a) The first order response; (b) the second order response; (c) the third order response; (d) the fourth order response

Fig. 2. Spectra recovered from nonlinear interferogram with traditional method

Fig. 3. Spectra recovered from nonlinear interferogram corrected with cross-iteration method

Fig. 4. Influence of direct current voltage deviation on correction accuracy

Fig. 5. Schematic of detector nonlinear correction experiment

Fig. 6. Spectra recovered from blackbody at different temperatures observed by detector

Fig. 7. Radiation spectra of blackbody before and after correction at 2200 ℃. (a) Entire spectra; (b)-(d) partial enlarged details

Fig. 8. Fitted curves at wavenumber of 1237.9 cm-1 before and after correction