Application of Wavelet Threshold Denoising in LIBS Spectral Denoising

LIBS technology is subject to significant noise interference when obtaining sample spectra due to the influence of external environment and equipment itself. To achieve better denoising effect, this article improves the threshold function based on a detailed analysis of wavelet threshold denoising, and proves its correctness. Solved the problem of defects in denoising between hard threshold functions and soft threshold functions. Finally, denoising was applied in coal spectra, and simulation consequences showed that the improved denoising method had better denoising effect.