基于高速扫描激光诱导击穿光谱仪的矿物表面多元素快速成像分析  

Rapid Multi-Element Surface Imaging Analysis of Minerals Based on High-Speed Scanning Laser Induced-Breakdown Spectroscopy Instrument

作　　者：饶宇 代渐雄 陈莎 杨燕婷 樊庆文[1] 段忆翔[1] RAO Yu;DAI Jian-Xiong;CHEN Sha;YANG Yan-Ting;FAN Qing-Wen;DUAN Yi-Xiang(School of Mechanical Engineering,Sichuan University,Chengdu 610065,China;Chengdu Aliben Science&Technology Co.Ltd.,Chengdu 611930,China)

机构地区：[1]四川大学机械工程学院,成都610065 [2]成都艾立本科技有限公司,成都611930

出　　处：《分析化学》2024年第10期1544-1552,共9页Chinese Journal of Analytical Chemistry

基　　金：四川省科技厅重点研发项目(No.2022YFG0235)资助。

摘　　要：基于激光诱导击穿光谱(Laser induced-breakdown spectroscopy,LIBS)的元素成像分析可为油气勘探活动提供重要的参考,提升LIBS元素成像分析仪器的扫描速度和空间分辨率有助于提高矿物表面元素分析的效率,对实现原位、实时和快速的LIBS分析具有重要意义。本研究基于扫描振镜装置开发了一种高速扫描LIBS元素成像分析仪,实现了100 Hz的扫描速度和50μm的空间分辨率。采用元素分布均匀的铝合金标准样品考察了此仪器的光谱数据稳定性,结果表明,利用此仪器采集4处不同位置的光谱数据,其相对标准偏差(RSD)分别为2.76%、2.79%、2.35%和2.55%,满足分析需求。同时优化了光谱采集通道,最终选择337~595 nm的光谱范围。采用此仪器对基质复杂的陨石矿物样品表面的主要元素进行成像分析,结合多元素成像算法可在同一图像上对4种主要元素进行可视化分析,揭示了元素分布的高度细节和复杂性。此仪器结合多元素成像分析算法可从微观尺度角度为地质研究过程中矿物中元素分布快速成像提供技术支持。Elemental imaging analysis based on laser induced-breakdown spectroscopy(LIBS)can provide significant reference value for oil and gas exploration activities.Improving the scanning speed and spatial resolution of LIBS elemental imaging analysis instruments contributes to enhancing the efficiency of mineral surface elemental analysis,which is crucial for achieving in-situ,real-time,and rapid LIBS analysis.In this study,a high-speed scanning LIBS elemental imaging analysis instrument was developed based on a scanning mirror device,achieving a scanning speed of 100 Hz and a spatial resolution of 50μm.The stability of spectral data collected by this instrument was validated using aluminum alloy standard samples with uniform elemental distribution.The experimental results showed that the relative standard deviations(RSD)of the spectral data collected at different locations were 2.76%,2.79%,2.35%and 2.55%,respectively,demonstrating that the instrument′s performance met analysis requirements.Analysis of spectral acquisition channels led to the selection of the 337–595 nm spectral range.Imaging analysis of major elements on the surface of meteorite mineral samples with complex matrices was conducted using this instrument,coupled with a multi-element imaging algorithm enabling visualization analysis of four major elements on the same image.The results revealed a higher level of detail and complexity in element distribution.The study demonstrated that this instrument,combined with multielement imaging analysis algorithms,could provide crucial technical support for rapid imaging of element distribution in minerals at a microscopic scale during geological research.

关 键 词：激光诱导击穿光谱 高速扫描 复杂基质 元素快速成像 

分 类 号：P618.13[天文地球—矿床学]