Continuous-wavelet-transform-based automatic curve fitting method for laser-induced breakdown spectroscopy

doi:10.1364/AO.57.007526

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	Continuous-wavelet-transform-based automatic curve fitting method for laser-induced breakdown spectroscopy
	Yang, Wenbin 1,2; Li, Bincheng 3; Zhou, Jiangning 1,2; Han, Yanling 1; Wang, Qiang 1
刊名	APPLIED OPTICS
	2018-09-10
卷号	57 期号:26 页码:7526-7532
关键词	Atomic emission spectroscopy Curve fitting Laser induced breakdown spectroscopy Separation
ISSN号	1559-128X
DOI	10.1364/AO.57.007526
文献子类	J
英文摘要	In this work, an automatic curve fitting method based on a continuous-wavelet transform (CWT) is proposed to resolve overlapped peaks and to adaptively extract the major peaks in laser-induced breakdown spectroscopy (LIBS). From the local minimum of the second derivative of the LIBS spectrum calculated with CWT, the number of individual peaks is determined, and corresponding peak positions are estimated. The full width at half-maximums (FWHMs) of individual peaks are estimated from the separation of two maxima siding the minimum. A threshold is introduced to eliminate the small peaks and therefore reduce the number of fitting parameters and adaptively extract the major peaks with different spectral intensities. The Trust-Region algorithm is used for parameter optimization. The proposed method is used to analyze both simulated LIBS spectra and experimental overlapped peaks. Both simulated and experimental results show that the proposed method can resolve overlapped peaks even with a low separation degree, although the minimum resolvable separation degree depends on the FWHM ratio and strength ratio of individual peaks and the wavelet scale. In a LIBS calibration experiment of N-2/SF6 gasses mixture, after resolving the overlapped peaks with the proposed method, better linear correlations between the concentration and intensity of F (with an adjusted R-squared value 0.9972), as well as between the concentration ratio and intensity ratio of nitrogen to fluorine (with adjusted R-squared values >0.98 and 0.99) are obtained. (C) 2018 Optical Society of America
WOS关键词	PEAK DETECTION ; LIBS ; STABILITY
语种	英语
WOS记录号	WOS:000444085500013
内容类型	期刊论文
源URL	[http://ir.ioe.ac.cn/handle/181551/9254]
专题	光电技术研究所_光电工程总体研究室（一室）
作者单位	1.Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu; 610209, China; 2.University of Chinese Academy of Sciences, Beijing; 100039, China; 3.School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu; 610054, China
推荐引用方式 GB/T 7714	Yang, Wenbin,Li, Bincheng,Zhou, Jiangning,et al. Continuous-wavelet-transform-based automatic curve fitting method for laser-induced breakdown spectroscopy[J]. APPLIED OPTICS,2018,57(26):7526-7532.
APA	Yang, Wenbin,Li, Bincheng,Zhou, Jiangning,Han, Yanling,&Wang, Qiang.(2018).Continuous-wavelet-transform-based automatic curve fitting method for laser-induced breakdown spectroscopy.APPLIED OPTICS,57(26),7526-7532.
MLA	Yang, Wenbin,et al."Continuous-wavelet-transform-based automatic curve fitting method for laser-induced breakdown spectroscopy".APPLIED OPTICS 57.26(2018):7526-7532.