铝合金中元素Cr和Cu的双脉冲激光诱导击穿光谱检测  

Trace Cr and Cu Analysis in Aluminum Alloy by Double Pulse Laser-Induced Breakdown Spectroscopy

作　　者：杨丽超 杨瑞兆 苏雪娇[1] 於有利 周卫东[1] YANG Lichao;YANG Ruizhao;SU Xuejiao;YU Youli;ZHOU Weidong(Key Laboratory of Optical Information Detection and Display Technology of Zhejiang,Zhejiang Normal University,Jinhua 321004,China;College of Physical Science and Technology,Yulin Normal University,Yulin 537000,China)

机构地区：[1]浙江省光信息检测与显示技术研究重点实验室,浙江师范大学,浙江金华321004 [2]玉林师范学院物理科学与工程技术学院,广西玉林537000

出　　处：《大气与环境光学学报》2019年第5期345-350,共6页Journal of Atmospheric and Environmental Optics

基　　金：国家自然科学基金,61178034~~

摘　　要：采用共线双脉冲激光诱导击穿光谱(Dual pulse laser induced breakdown spectroscopy,DP-LIBS)技术分析铝合金中微量元素含量,详细研究了共线双脉冲光谱信号强度与双脉冲间时间延迟的关系,最佳延时为8~9μs.在该延时条件下,双脉冲光谱信号强度比单脉冲光谱信号强度增强了10倍以上.分别采用双脉冲激光诱导击穿光谱和单脉冲激光诱导击穿光谱(Single-pulse laser induced breakdown spectroscopy,SP-LIBS)技术,得到了以Cu I 324.75 nm,Cr I 425.43 nm谱线为分析线的定标曲线.与采用单脉冲激光诱导击穿光谱技术相比,铝合金中Cu和Cr的检测极限分别由单脉冲时的169.5和94.5μg/g降低至双脉冲时的21.46和4-26μg/g.A collinear dual pulse laser induced breakdown spectroscopy(DP-LIBS)has been used for trace element analysis in aluminum alloy.The dependence of signal intensity on the inter-pulse delay time has been carefully investigated,which gives an optimized delay time of about 8~9μs.For the two selected analytical lines Cu I 324.75 nm and Cr I 425.43 nm,more than 10 folds enhancement of line intensities have been obtained compared to that of single-pulse laser induced breakdown spectroscopy(SP-LIBS).Calibration curves for quantitative measurement of Cu and Cr were derived using both SP-LIBS and DP-LIBS techniques.The limit of detection(LOD)of elements Cu and Cr are found to be 21.46 and 4.26μg/g respectively with DP-LIBS,while the LOD of elements Cu and Cr are 169.5 and 94.5μg/g with SP-LIBS.

关 键 词：激光诱导击穿光谱 CR CU 检测灵敏度 

分 类 号：O433[机械工程—光学工程]