Study on quantitative analysis of slag based on spectral normalization of laser-induced plasma image  

作　　者：Zhi-Bo Ni King-Long Chen Hong-Bo Fu Jing-Ge Wang Feng-Zhong Dong 

机构地区：[1]Anhui Institute of Optics Fine Mechanics, Chinese Academy of Sciences, Anhui Provincial Key Laboratory of Photonic Devices and Materials, Hefei 230031, China [2]School of Instrument Science Opto-Eleetronic Engineering, Hefei University of Technology, Hefei 230009, China

出　　处：《Frontiers of physics》2014年第4期439-445,共7页物理学前沿（英文版）

基　　金：We acknowledge the financial support from the National Natural Science Foundation of China （Grant No. 11075184） and the Knowledge Innovation Program of the Chinese Academy of Sciences （Grant No. Y03RC21124）.

摘　　要：To reduce the influence of laser-induced breakdown spectroscopy （LIBS） experimental parameter fluctuations to quantitative analysis of slag components, a normalization method using integral intensity of plasma image was proposed and a series of experiments with slag samples were performed. Mg II 279.55 nm, Ca II 396.85 and Ca I 422.67 nm were selected as analytical lines, and analytical curves of reference mass fractions versus spectral line intensities were established. With the incre- ment of set threshold for edge extraction of plasma image, the determination coefficients and relative standard deviations of analytical curves were improved gradually and reached the optimmn values when the threshold was equal to 10 000. Comparing with the results without normalization and normalized by whole spectrum area, the relativity between spectral line intensity and mass fraction can be enhanced etfieiently after normalized by integral intensity of plasma image. The verification experiments with Ti alloy samples further confirmed the conclusions mentioned above.To reduce the influence of laser-induced breakdown spectroscopy （LIBS） experimental parameter fluctuations to quantitative analysis of slag components, a normalization method using integral intensity of plasma image was proposed and a series of experiments with slag samples were performed. Mg II 279.55 nm, Ca II 396.85 and Ca I 422.67 nm were selected as analytical lines, and analytical curves of reference mass fractions versus spectral line intensities were established. With the incre- ment of set threshold for edge extraction of plasma image, the determination coefficients and relative standard deviations of analytical curves were improved gradually and reached the optimmn values when the threshold was equal to 10 000. Comparing with the results without normalization and normalized by whole spectrum area, the relativity between spectral line intensity and mass fraction can be enhanced etfieiently after normalized by integral intensity of plasma image. The verification experiments with Ti alloy samples further confirmed the conclusions mentioned above.

关 键 词：laser-induced breakdown spectroscopy analytical curve plasma image NORMALIZATION 

分 类 号：O53[理学—等离子体物理] TP391.41[理学—物理]