激光诱导击穿光谱技术在光谱数据的增强和定量分析上的基础研究

Basic research on enhancement and quantitative analysis of spectral data by laser induced breakdown spectroscopy

激光诱导击穿光谱技术(Laser-Induced Breakdown Spectroscopy, LIBS)是一种通过脉冲激光聚焦样品产生等离子体,对等离子体发射光谱进行分析进而得到物质成分和含量的一种原子发射光谱技术。LIBS由于其成本低、适用范围广、样品无需复杂的预处理、检测速度快且可实现原位检测等特点成为了元素分析的一大热门,在工业、环境保护、生物医学、珍贵物品鉴定、军事等领域都有着很好的应用前景。但在分析元素种类与含量时,对光谱结果的分析常会受到基体效应、自吸收效应、等离子体屏蔽效应等因素的影响,使得提高LIBS技术的精确度成为了一大议题。本文基于LIBS的简介和基本原理和技术优点,详细分析了LIBS现阶段存在的问题及光谱增强的途径,并综述了定量分析的指标和方法,为LIBS更精确的检测提供了更多途径。

Laser-induced breakdown spectroscopy is a kind of atomic emission spectroscopy,in which plasma is produced by focusing a sample with pulsed laser,and the emission spectrum of plasma is analyzed to obtain the composition and content of matter.LIBS has become a hot topic in elemental analysis due to its low cost,wide application range,no complex pre-treatment of samples,fast detection speed and in situ detection.LIBS has a good application prospect in industry,environmental protection,bio-medicine,precious objects identification,military and other fields.However,in the analysis of element types and contents,the analysis of spectral results is often affected by matrix effect,self-absorption effect,plasma shielding effect and other factors,so improving the accuracy of LIBS technology has become a major issue.In this paper,based on the introduction and basic principle of LIBS,the existing problems of LIBS and the ways of spectral enhancement are analyzed in detail,and the indexes and methods of quantitative analysis are summarized,which provides more ways for more accurate detection of LIBS.