Interference correction for laser-induced breakdown spectroscopy using deconvolution algorithm
The interference of continuum background and overlapped peaks on laser-induced breakdown spectroscopy (LIBS) was considered as one of the major obstacles in LIBS quantitative analysis. To minimize the impact, an algorithm based on iterative discrete wavelet transform (IDWT) and Richardson-Lucy deconvolution (RLD) was developed. The optimization of IDWT and RLD was implemented. A broadening compression ratio of about 5 times could be obtained using RLD. After data processing, the R2s were increased from 0.973 to 0.993 for Mn in iron alloy and from 0.816 to 0.985 for Fe in aluminum alloy, respectively. Meanwhile, the RMSECV decreased from 0.057 wt.% to 0.032 wt.% and from 0.101 wt.% to 0.041 wt.%, respectively. This work demonstrates that IDWT combined with RLD can be a powerful and potential algorithm for spectral interference correction.