Wavelet packet transform in optical fiber gas sensor system of signal denoising

In optical absorption spectra of methane gas sensing system, detected signal is very weak when detecting the concentration of methane gas. The main effect of the wavelet transform is to eliminate the background noise contained in the original spectra. In this paper, Absorption spectra denoising in the optical gas sensor system using wavelet packet is proposed based on wavelet transform. We have done a research on the relationship between the methane gas and detection voltage at the same temperature and under different concentrations. Experiments show that using wavelet packet denoising method is very effective.