Fig. 1. Interferograms with impulse noise. (a) Interferogram recorded when the drive circuit of scanning motor is disabled; (b) interferogram recorded when the drive circuit of scanning motor is enabled; (c) stretched display corresponding to Fig. 1(a); (d) stretched display corresponding to Fig. 1(b)

Fig. 2. Noise of interferograms. (a) When the drive circuit of scanning motor is disabled; (b) when the drive circuit of scanning motor is enabled

Fig. 3. Noise of interferograms after the low-frequency fixed noise is filtered. (a) When the drive circuit of scanning motor is disabled; (b) when the drive circuit of scanning motor is enabled

Fig. 4. Noise histograms of interferograms without impulse noise

Fig. 5. Noise histograms of interferograms with impulse noise

Fig. 6. Comparison of standard deviationin uncalibrated spectra

Fig. 7. Frequency spectra of low-frequency fixed noise and Gaussian noise

Fig. 8. Predefined mask of interferogram

Fig. 9. Result of different impulse noise suppressing methods

Fig. 10. Spectral relative deviation of different impulse noise suppressing methods

Fig. 11. Results of impulse noise suppression. (a) A_max=30, R=0.01; (b) A_max =60, R=0.01; (c) A_max =60, R=0.1; (d) A_max =60, R=0.05

Fig. 12. Interferogram comparison before and after impulse noise suppression

Fig. 13. NEdN comparison before and after impulse noise suppression