液相射流中中Al元素单双脉冲LIBS研究(英文)  

Single-and Dual-Pulse Laser Induced Breakdown Spectroscopy for Aluminum in Liquid Jets

作　　者：王莉[1,2] 徐丽[1,2] 徐卫青[1] 姚关心[2] 郑先锋[2] 崔执凤 

机构地区：[1]蚌埠学院数学与物理系,安徽蚌埠233030 [2]安徽师范大学原子与分子物理研究所,安徽芜湖241000

出　　处：《光谱学与光谱分析》2018年第1期314-319,共6页Spectroscopy and Spectral Analysis

基　　金：the Professional Comprehensive Reform Project (2014zy075), and the National Natural Science Foundation of China (61475001, 11604003)

摘　　要：为了综合比较单双脉冲激光诱导击穿光谱技术(LIBS)在液体中重金属元素的检测效果,利用自建的液相射流单-双脉冲LIBS技术装置,对AlCl3水溶液中的Al元素LIBS特性进行测量和分析。实验中使用两台532nm Nd∶YAG激光器作为激发光源,等离子体辐射信号通过光谱仪和ICCD进行采集。实验研究了单脉冲下Al(396.15nm)发射谱线的谱线强度随激光能量、ICCD门延时、门宽之间的变化关系,获得了最优化实验参数激光能量为50mJ,ICCD门延迟为1 200ns,门宽为150ns。在相同的实验条件下,实验考察了Al(369.15nm)发射谱线的谱线强度随双脉冲之间的延时,激光总能量,ICCD门延时的变化关系,获得了最优化实验参数为两双脉冲之间的延时为1 000ns,激光总能量为50mJ,ICCD门延时为1 100ns。单脉冲和双脉冲条件下获得重金属Al的LIBS检测限分别为26.79和10.80ppm,双脉冲LIBS技术使元素检测限下降2倍多。实验结果表明双脉冲可以提升LIBS技术的探测灵敏度,为LIBS技术应用于水体中重金属快速检测提供了依据。A homemade experimental setup of laser-induced breakdown spectroscopy （LIBS） with aqueous jets was used to compare the detection results of dual-pulse （DP-LIBS） and single-pulse laser-induced breakdown spectroscopy （SP-LIBS） for heavy metal elements in liquids .Two Q-switched Nd：YAG lasers that operated at 532 nm were utilized to generate plasma on the AlCl3 aqueous jets .The plasma emission signal was detected by spectrometer with an intensified charge-coupled device （ICCD） .The effects of laser-pulse energy ,ICCD gate width ,and ICCD gate delay on the intensity of the Al spectral line at 396.15 nm were presented for SP-LIBS .Experimental results showed the optimum parameters for laser energy ,ICCD gate width ,and gate delay were 50 mJ ,150 ns ,1200 ns ,respectively .The influence of experimental parameters ,including interpulse delay ,total pulse energy ,and ICCD gate delay on the signal enhancement of the Al 396.15 nm spectral line in-tensity was investigated and optimized .Results showed that the optimal parameters for interpulse delay ,total pulse energy ,and ICCD gate delay were 1000 ns ,50 mJ ,1100 ns respectively .The detection limits of Al were 26.79 and 10.80 ppm by SP-LIBS and DP-LIBS ,respectively .The results indicated that DP-LIBS can improve the detection sensitivity which offers a feasible basis for the detection of metallic elements in liquid .

关 键 词：激光诱导击穿光谱(LIBS) 单-双脉冲 液体射流 检测限 

分 类 号：O433.4[机械工程—光学工程]