The noise suppression method of long-wave infrared Fourier spectrometer at various piecewise

Many industrial gases and aerosols have rich spectral characteristics in the long-wave infrared band, which can play an important role in gas detection and chemical protection. In this paper, the principle of Gaussian filtering and the establishment process of Gaussian operator are introduced, and a noise suppression method of long-wave infrared Fourier spectrometer at various piecewise is proposed. The amplitude of interference signal is mapped into noise estimation weight, and then the size and weight of Gaussian filter window are selected to realize adaptive Gaussian filtering of noise estimation weight. Compared with median filtering, mean filtering and single window Gaussian filtering, the experiment shows that the proposed algorithm can protect the spectral energy and suppress the influence of noise on the signal, and the filtering effect is obvious.