基于一种远程双脉冲激光诱导击穿光谱系统原位分析钢样成分

In-Situ Analysis of Solid Steel Samples with Remote Double-Pulse Laser-Induced Breakdown Spectroscopy System

为了实现钢铁等金属熔炼过程中实时、在线监测元素组分含量,设计了一种远程双脉冲激光诱导击穿光谱(LIBS)分析系统,对远距离的样品进行非接触式远程测量、成分分析。首先利用固体标准钢样对系统进行了测试以及标定,为下一步利用此系统在线监测熔融钢液组分含量提供了基础。实验结果表明:激光远距离聚焦光斑在1 mm左右;双脉冲烧蚀比单脉冲烧蚀深度深很多;双脉冲最佳延时在不同距离下不一致;3.1 m处双脉冲增强效果比2.1 m处更好,其中Ti(Ⅰ)319.99 nrn增强最显著为5.19倍;各种元素的标定曲线相关系数r都在0.99左右,重复精度(RSD)基本都小于5%,测量偏差(RMSE)都小于0.021%,2.1m处的检出限相比3.1 m处更低,2.1 m处多数元素检出限小于500 ppm。

In order to realize real-time ,online monitoring of the component of steel and other metal smelting process ,we de-signed a remote double-pulse laser-induced breakdown spectroscopy （LIBS） analysis system which can realize non-contact remote measurement and component analysis for long distance sample .The paper first tests the system on solid standard steel samples , which provides basis for online monitoring the component of molten steel .The experimental results show ：laser focal spot is a-bout 1mm in long distance ;double-pulse ablation depth is deeper than single pulse’s ;the optimum delay of double-pulse is non-consistent in different distances ;the enhancement effect of double-pulse in 3.1 m is better than that in 2.1 m ,and the maximum enhancement is 5.19 of Ti（Ⅰ） 319.99 nm ;the calibration curve of R2 is about 0.99 ,RSD being less than 5% ,RMSE being less than 0.021% ,LOD being less than 500 ppm for most elements in 2.1 m ,which is better than that in 3.1 m .