Fig. 1. Schematic of the structure of photo-elastic modulation Fourier transform spectrometer

Fig. 2. Flow chart of NUFFT algorithm

Fig. 3. Detector spectral response curve

Fig. 4. Flow chart of simulation and analysis

Fig. 5. MATLAB simulation results. (a) Blackbody simulation interference signal; (b) comparison between blackbody restoration spectrum and theory spectrum

Fig. 6. Fitting results of spectra with different orders

Fig. 7. Blackbody interference signal and reconstructed spectra generated by PEM with large optical path difference. (a) Interferogram produced by PEM with large optical path difference; (b) blackbody spectrum reconstructed by accelerated NUFFT algorithm; (c) instrument response curve of temperature measuring device; (d) reconstructed blackbody spectra after modifying the response

Fig. 8. Selection of measurement wavelength. (a) Selection of measurement wavelength of 1600 ℃ blackbody reconstructed spectrum; (b) selection of measurement wavelengths and theoretical curves under different temperatures

Fig. 9. Measured temperature fluctuation graph