Open AccessContinuous background correction using effective points selected in third-order minima segments in low-cost laser-induced breakdown spectroscopy without intensified CCD
Author(s) -
Jianli Liu,
Rui Zhang,
Xiaotian Li,
Jianjun Chen,
Jianan Liu,
Jiali Qiu,
Xun Gao,
Jia Cui,
heshig bayan
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.016171
Subject(s) - maxima and minima , laser induced breakdown spectroscopy , optics , interpolation (computer graphics) , spectroscopy , spectral line , laser , materials science , algorithm , mathematics , computer science , physics , artificial intelligence , mathematical analysis , motion (physics) , quantum mechanics , astronomy
This work presents a method that can automatically estimate and remove varying continuous background emission for low-cost laser-induced breakdown spectroscopy (LIBS) without intensified CCD. The algorithm finds all third-order minima points in spectra and uses these points to partition the spectra into multiple subintervals. The mean value is then used as a threshold to select the effective points for the second-order minima in each subinterval. Finally, a linear interpolation method is used to realize extension of these effective points and complete fitting of the background using polynomials. Using simulated and real LIBS spectra with different complexities examine the validity of proposed algorithm. Additionally, five elements of five standard cast iron alloy samples are calibrated and improved very well after background removal. The results successfully prove the validity of the background correction algorithm.