A method for improving wavelet threshold denoising in laser-induced breakdown spectroscopy

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	A method for improving wavelet threshold denoising in laser-induced breakdown spectroscopy
	Zhang B(张博); Sun LX(孙兰香); Yu HB(于海斌); Xin Y(辛勇); Cong ZB(丛智博)
刊名	Spectrochimica Acta - Part B Atomic Spectroscopy
	2015
卷号	107 页码:32-44
关键词	Laser-induced breakdown spectroscopy Wavelet threshold denoising Decomposition level
ISSN号	0584-8547
通讯作者	孙兰香
产权排序	1
中文摘要	The wavelet threshold denoising method is an effective noise suppression approach for noisy laser-induced breakdown spectroscopy signal. In this paper, firstly, the noise sources of LIBS system are summarized. Secondly, wavelet multi-resolution analysis and wavelet threshold denoising method are introduced briefly. As one of the major factors influencing the denoising results in the process of wavelet threshold denoising, the optimal decomposition level selection is studied. Based on the entropy analysis of noisy LIBS signal and noise, a method of choosing optimal decomposition level is presented. Thirdly, the performance of the proposed method is verified by analyzing some synthetic signals. Not only the denoising results of the synthetic signals are analyzed, but also the ultimate denoising capacity of the wavelet threshold denoising method with the optimal decomposition level is explored. Finally, the experimental data analysis implies that the fluctuation of the noisy LIBS signals can be decreased and the weak LIBS signals can be recovered. The optimal decomposition level is able to improve the performance of the denoising results obtained by wavelet threshold denoising with non-optimal wavelet functions. The signal to noise ratios of the elements are improved and the limit of detection values are reduced by more than 50% by using the proposed method.
WOS标题词	Science & Technology ; Technology
类目[WOS]	Spectroscopy
研究领域[WOS]	Spectroscopy
关键词[WOS]	SIGNAL ENHANCEMENT ; TRANSFORM ; LIBS ; OPTIMIZATION ; LEAD
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000354155100005
公开日期	2015-03-30
内容类型	期刊论文
源URL	[http://ir.sia.cn/handle/173321/15780]
专题	沈阳自动化研究所_工业控制网络与系统研究室
推荐引用方式 GB/T 7714	Zhang B,Sun LX,Yu HB,et al. A method for improving wavelet threshold denoising in laser-induced breakdown spectroscopy[J]. Spectrochimica Acta - Part B Atomic Spectroscopy,2015,107:32-44.
APA	Zhang B,Sun LX,Yu HB,Xin Y,&Cong ZB.(2015).A method for improving wavelet threshold denoising in laser-induced breakdown spectroscopy.Spectrochimica Acta - Part B Atomic Spectroscopy,107,32-44.
MLA	Zhang B,et al."A method for improving wavelet threshold denoising in laser-induced breakdown spectroscopy".Spectrochimica Acta - Part B Atomic Spectroscopy 107(2015):32-44.