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An intensity correction method combined with plasma position information for Laser-Induced Breakdown Spectroscopy

Abstract

The uncertainty of the collected spectral data is one of the most important issues for the application of laser-induced breakdown spectroscopy (LIBS) quantitative analysis. The fluctuation of the target surface affects both the focus depth of the laser beam and the relative collection position simultaneously, either of which may lead to severe fluctuation of the spectral signal. Thus, in this work, for detecting and reducing the fluctuation, an imaging system was deployed to monitor the plasma, and a mathimetical model was also built based on both spectral signal and positional information. An ICCD camera was used to record the image of the plasma so as to detect the plasma and acquire the positional information. Furthermore, the relationship between the plasma position and the specific spectral line intensity was made by fitting function. Five aluminium alloy samples were employed to validate the reliability of the proposed method. As a result, the average RSDs of the samples (with the position fluctuation range about 2 mm) in different spectral lines (Si 288.15 nm, Fe 273.95 nm, Cu 324.75 nm, Mn 259.37 nm and Mg 280.27 nm) were reduced from 34.57%, 38.86%, 31.05%, 39.74%, 36.91% (without normalization) to 4.63%, 6.84%, 5.64%, 7.64%, 4.83% (with the combination method presented in this paper), respectively; and the determination coefficients (R2) reached 0.996, 0.999, 0.989, 0.999, 0.9999, respectively. It proves that the proposed method can both improve the measurement reliability and guarantee the measurement accuracy.

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Publication details

The article was accepted on 13 Oct 2017 and first published on 13 Oct 2017


Article type: Paper
DOI: 10.1039/C7JA00291B
Citation: J. Anal. At. Spectrom., 2017, Accepted Manuscript
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    An intensity correction method combined with plasma position information for Laser-Induced Breakdown Spectroscopy

    P. Zhang, L. Sun, H. Yu, P. Zeng, L. Qi and Y. Xin, J. Anal. At. Spectrom., 2017, Accepted Manuscript , DOI: 10.1039/C7JA00291B

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