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基于响应面法的激光诱导击穿光谱实验装置参数优化研究

Parameter Optimization of Laser-Induced Breakdown Spectroscopy Experimental Device Based on Response Surface Methodology

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摘要

激光诱导击穿光谱技术(LIBS)具有无需制备样品、多元素同时测量和快速检测等优点,在物质检测领域得到了广泛应用,选择合适的实验装置参数是其取得良好检测效果的重要基础。在单因素实验的基础上,以激光能量、延迟时间和焦深为影响因素,以光谱信背比作为响应指标,建立了一种优化激光诱导击穿光谱实验装置参数的多因素响应面模型。研究了不同影响因素及它们之间的耦合作用对光谱质量的影响,得到的最优实验参数为激光能量114 mJ,延迟时间1.86 μs,焦深1.75 mm。最后,对响应面法所得的最优实验参数进行实验验证,得出谱线信背比均值为7.45,较单因素实验法提高了1.92%,相对标准偏差为3.16%,较单因素实验法下降了0.94%。结果表明,响应面法比单因素实验法更加有效、可靠。

Abstract

Laser-induced breakdown spectroscopy (LIBS) has been widely used in the field of material detection due to its advantages such as no sample preparation, multi-element simultaneous analysis and rapid detection. Selecting appropriate parameters of the experimental device is an important prerequisite for achieving a good detection effect. Based on the single factor experiment, a multi-factor response surface model for optimizing the parameters of the laser-induced breakdown spectroscopy experimental device is established with laser energy, delay time and depth of focus as the influencing factors and with spectral signal-to-background ratio as the response factor. The influence of different influencing factors and their coupling effects on the spectral quality are studied and the obtained optimal experimental parameters are laser energy of 114 mJ, delay time of 1.86 μs, and depth of focus of 1.75 mm. Finally, the optimal experimental parameters obtained by the response surface methodology are verified by experiments. The mean value of the signal-to-background ratio of the spectral line is 7.45, which is 1.92% higher than that by the single factor method, and the relative standard deviation is 3.16%, which is 0.94% lower than that by the single factor method. The results show that the response surface methodology is more effective and reliable than the single factor method.

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中图分类号:O433.4

DOI:10.3788/CJL202047.0911001

所属栏目:光谱学

基金项目:江苏省重点研发计划、南京航空航天大学研究生创新基地开放基金;

收稿日期:2020-03-30

修改稿日期:2020-04-15

网络出版日期:2020-09-01

作者单位    点击查看

潘立剑:南京航空航天大学机电学院, 江苏 南京 210001
陈蔚芳:南京航空航天大学机电学院, 江苏 南京 210001
周晏锋:南京航空航天大学机电学院, 江苏 南京 210001
崔榕芳:南京航空航天大学机电学院, 江苏 南京 210001

联系人作者:陈蔚芳(meewfchen@nuaa.edu.cn)

备注:江苏省重点研发计划、南京航空航天大学研究生创新基地开放基金;

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引用该论文

Pan Lijian,Chen Weifang,Zhou Yanfeng,Cui Rongfang. Parameter Optimization of Laser-Induced Breakdown Spectroscopy Experimental Device Based on Response Surface Methodology[J]. Chinese Journal of Lasers, 2020, 47(9): 0911001

潘立剑,陈蔚芳,周晏锋,崔榕芳. 基于响应面法的激光诱导击穿光谱实验装置参数优化研究[J]. 中国激光, 2020, 47(9): 0911001

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