多光丝耦合诱导击穿光谱土壤微量元素检测  

Multi-Filament Interaction Induced Breakdown Spectroscopy for Trace Element Detection in Soil

作　　者：乔蔚 胡梦云[1,2,3] 葛锦蔓 李芳芳 许书鹏 闫明 李小军 曾和平[1,2] Qiao Yu;Hu Mengyun;Ge Jinman;Li Fangfang;Xu Shupeng;Yan Ming;Li Xiaojun;Zeng Heping(State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200062,China;Chongqing Key Laboratory of Precision Optics,Chongqing Institute,East China Normal University,Chongqing 401120,China;ROI Optoelectronics Technology Co.,Ltd.,Shanghai 201108,China;National Key Laboratory of Science and Technology on Space Microwave,China Academy of Space Technology(Xi'an),Xi'an 710100,Shaanxi,China)

机构地区：[1]华东师范大学精密光谱科学与技术国家重点实验室,上海200062 [2]华东师范大学重庆研究院精密光学重庆市重点实验室,重庆401120 [3]上海朗研光电科技有限公司,上海201108 [4]中国空间技术研究院西安分院空间微波技术国家级重点实验室,陕西西安710100

出　　处：《中国激光》2023年第7期108-115,共8页Chinese Journal of Lasers

基　　金：科技部重点研发计划(2018YFB0504400);上海市青年科技启明星计划(22QC1401000);国家预研基金(HTKJ2021KL504014);国家自然科学基金(62035005,11621404);上海市科学技术委员会量子项目(2019SHZDZX01-ZX05,2019SHZDZX01-ZX06)。

摘　　要：检测灵敏度是衡量一项检测技术的重要参数。为了提高激光诱导击穿光谱技术(LIBS)的检测灵敏度,搭建了三光丝耦合诱导击穿光谱(TIBS)系统,对土壤中的微量铬元素进行检测,并将检测结果与等离子体光栅诱导击穿光谱(GIBS)系统、光丝诱导击穿光谱(FIBS)系统进行对比。TIBS系统的谱线信号强度比GIBS系统增强了2倍,比FIBS系统增强了7~11倍。研究了FIBS、GIBS、TIBS系统的谱线强度随样品位置的变化,发现TIBS系统的激发稳定性与GIBS系统相近。此外,在对土壤中重金属铬的定量研究中,发现FIBS、GIBS、TIBS系统对土壤中铬元素的检出限分别为22.18×10^(-6)、8.68×10^(-6)、5.06×10^(-6)。TIBS系统相较于GIBS系统能进一步提高检测灵敏度。Objective Excess heavy metals in soil can seriously affect the growth of crops,among which chromium is considered to be one of the most toxic heavy metals.Excess chromium levels can lead to retarded plant growth and reduced yields,and can affect human health when consumed.Therefore,chromium detection in soil has become an important research element in the field of agriculture.Laser-induced breakdown spectroscopy(LIBS)can be used for the detection of heavy metals in soil.This technique has the advantages of simultaneous detection of multiple elements,online detection,and simple sample preparation methods.Conventional nanosecond laser-induced breakdown spectroscopy has poor reproducibility due to the influence of background continuum spectra and matrix effects during the detection process.Improved methods include filament-induced breakdown spectroscopy(FIBS)based on femtosecond filament,plasma-grating-induced breakdown spectroscopy(GIBS)based on the non-collinear superposition of two femtosecond filaments,multidimensional-plasma-grating-induced breakdown spectroscopy(MIBS)based on the superposition of three non-coplanar femtosecond filaments,and triple-filament interaction induced breakdown spectroscopy(TIBS)based on the coplanar and non-collinear superposition of three femtosecond filaments.All these methods do not require the introduction of additional equipment and complex sample preparation methods.Among these improved methods,GIBS and MIBS have been well-studied.However,studies on TIBS are still lacking,especially regarding the detection of heavy metals in soil.Methods In this study,a TIBS system based on the superposition of three coplanar and non-collinear femtosecond beams,a GIBS system based on the superposition of two noncollinear femtosecond beams,and a FIBS system based on one femtosecond beam are developed to study the heavy-metal detection capability of these three systems in soil.Standard soil samples are doped with various mass fraction Cr elements and pressed into sheets.To ensure that the position

关 键 词：光谱学 激光诱导击穿 等离子体光栅 超快飞秒脉冲 重金属 检出限 

分 类 号：O436[机械工程—光学工程]