空间约束结合支持向量机提高毫秒激光诱导击穿光谱的铝合金中的Fe元素成分检测精度

doi:10.3964/j.issn.1000-0593(2022)02-0582-05

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摘要：铝合金中Fe元素的浓度会影响铝合金的软硬程度，从而影响铝合金器件的工作使用寿命，因此铝合金中Fe的含量检测精度非常重要，开展了空间约束结合支持向量机提高毫秒激光诱导击穿光谱的铝合金中的Fe元素成分检测精度研究。在平板空间约束条件下，毫秒激光诱导铝等离子体光谱出现了光谱增强，并且提高了等离子体辐射光谱稳定性，光谱辐射中的Fe Ⅰ 345.99 nm，Fe Ⅰ 369.51 nm，Al Ⅰ 394.40 nm，Al Ⅰ 396.15 nm四条特征谱线的增强因子分别为2.20，2.14，2.28，2.41。建立了基于外标法和支持向量机(SVM)的铝合金中Fe元素定量分析定标模型，采用外标法得到有无平板空间约束下ms-LIBS对Fe元素的定标曲线的拟合相关系数R²，RMSEC，RMSEP和ARE分别为0.893，0.261 Wt%，0.156 Wt%，40.977%和0.852，0.337 Wt%，0.274 Wt%，42.947%。在约束条件下SVM模型的RMSEC为0.086 2 Wt%，RMSEP为0.043 1 Wt%；采用SVM方法得到有无平板空间约束下ms-LIBS对Fe元素的定标曲线的拟合相关系数R²，RMSEC，RMSEP和ARE分别为0.984，0.086 Wt%，0.043 Wt%，3.715%和0.941，0.134 Wt%，0.051 Wt%，12.353%。结果表明，在空间约束条件下，采用ms-LIBS结合SVM方法能够大幅度提高ms-LIBs的定量分析精度和实验重复性，且有效降低了铝合金的基体效应，能够满足铝合金的痕量元素快速检测。

关键词：激光诱导击穿光谱；支持向量机；空间约束；毫秒激光；铝合金

Abstract：The content of Fe will affect the hardness of the aluminum alloy, and further affect the working life of aluminum alloy devices. Therefore, the detection accuracy of Fe content in the aluminum alloy is very important. In this paper, the detection accuracy improvement of Fe element in the aluminum alloy by millisecond laser-induced breakdown spectroscopy (ms-LIBS) under spatial confinement combined with support vector machine (SVM) was employed. Under the confinement of the plate space, the millisecond laser-induced aluminum plasma spectrum achieves spectral enhancement and the plasma radiation spectrum stability was improved. The spectral enhancement factors of the four characteristic spectral lines Fe Ⅰ 345.99 nm, Fe Ⅰ 369.51 nm, Al Ⅰ 394.40 nm, and Al Ⅰ 396.15 nm are 2.20, 2.14, 2.28, and 2.41, respectively. The calibration models for quantitative analysis of Fe in aluminum alloy based on external standard method and SVM were established. The standard external method was used to calculate the R², RMSEC, RMSEP, and ARE of the Fe element with the plate space constraint of 0.893, 0.261 Wt%, 0.156 Wt%, 40.977%, and R², RMSEC, RMSEP, and ARE without the plate space constraint were 0.852, 0.337 Wt%, 0.274 Wt%, 42.947% respectively. Under the constraints, the RMSEC of the SVM model was 0.086 Wt%, and the RMSEP was 0.043 Wt%. The SVM method was used to calculate the R², RMSEC, RMSEP, and ARE of the Fe element with the plate space constraint of 0.984, 0.086 Wt%, 0.043 Wt%, 3.715%, and R², RMSEC, RMSEP, and ARE without the plate space constraint were 0.941, 0.134 Wt%, 0.051 Wt%, and 12.353%. The results show that under space constraints, the use of ms-LIBS combined with the SVM method can greatly improve the quantitative analysis accuracy and experimental repeatability of ms-LIBs, and effectively reduce the matrix effect of aluminum alloy, which can meet the trace elements of aluminum alloy Quick check.

Key words：Laser-induced breakdown spectroscopy; Support Vector Machine; Spatial constraint; Millisecond laser; Aluminum alloy

收稿日期: 2020-12-29 修订日期: 2021-01-21

中图分类号:

O433.4

基金资助: 国家自然科学基金项目(61575030)，吉林省科技厅项目（20200301042RQ）资助

通讯作者: 高勋，宋超

作者简介: 秦爽，1995年生，长春理工大学理学院硕士研究生 e-mail: 13304346161@163.com *通讯作者 e-mail: lasercust@163.com; songchao@cust.edu.cn

引用本文:

秦爽，李明亮，戴宇佳，高勋，宋超，林景全. 空间约束结合支持向量机提高毫秒激光诱导击穿光谱的铝合金中的Fe元素成分检测精度[J]. 光谱学与光谱分析, 2022, 42(02): 582-586.
QIN Shuang, LI Ming-liang, DAI Yu-jia, GAO Xun, SONG Chao, LIN Jing-quan. The Accuracy Improvement of Fe Element in Aluminum Alloy by Millisecond Laser Induced Breakdown Spectroscopy Under Spatial Confinement Combined With Support Vector Machine. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(02): 582-586.

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