铝合金中元素Cr和Cu的双脉冲激光诱导击穿光谱检测

摘要/Abstract

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$\sim$9 $\mu$s。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94.5 $\mu$g/g降低至双脉冲时的21.46 和4.26 $\mu$g/g。

关键词: 激光诱导击穿光谱, Cr, Cu, 检测灵敏度

Abstract: 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$\sim$9 $\mu$s.
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 4.26 $\mu$g/g respectively with DP-LIBS,
while the LOD of elements Cu and Cr are 169.5 and 94.5 $\mu$g/g with SP-LIBS.

Key words: dual pulse laser induced breakdown spectroscopy, , Cr, , Cu, , limit of detection

中图分类号:

O433

杨丽超1,杨瑞兆2,苏雪娇1,於有利1,周卫东1. 铝合金中元素Cr和Cu的双脉冲激光诱导击穿光谱检测[J]. 大气与环境光学学报.

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