光谱学与光谱分析, 2015, 35 (7): 2017, 网络出版: 2015-09-08   

基于信背比拟合的水体重金属LIBS定量分析研究

Quantitative Analysis of Heavy Metals in Water with LIBS Based on Signal-to-Background Ratio
作者单位
1 中国科学院安徽光学精密机械研究所环境光学与技术重点实验室, 安徽 合肥 230312
2 合肥师范学院电子信息工程学院, 安徽 合肥 230011
摘要
LIBS技术定量分析的精密度与准确度受到多种因素的影响.通过深入分析激光诱导等离子体背景光谱和特征光谱的特性,利用两者随温度的变化趋势近似相同的特点,采用两者的比值即信背比进行元素浓度的定量拟合,可以补偿激光能量、光谱接收效率等系统参数抖动造成的谱线强度变化;针对测量数据有限及非线性的特点,使用支持向量机算法进行回归.实验结果表明通过信背比拟合可以提高LIBS定量分析的稳定性和准确性,测试集的相对标准偏差和相对误差平均值分别为4.7%和9.5%.基于信背比的数据拟合方法不受基体元素和背景大小限制,为实时在线的LIBS定量分析技术提供数据处理方面的参考.
Abstract
There are many influence factors in the precision and accuracy of the quantitative analysis with LIBS technology.According to approximately the same characteristics trend of background spectrum and characteristic spectrum along with the change of temperature through in-depth analysis,signal-to-background ratio(S/B) measurement and regression analysis could compensate the spectral line intensity changes caused by system parameters such as laser power,spectral efficiency of receiving.Because the measurement dates were limited and nonlinear,we used support vector machine(SVM) for regression algorithm.The experimental results showed that the method could improve the stability and the accuracy of quantitative analysis of LIBS,and the relative standard deviation and average relative error of test set respectively were 4.7% and 9.5%.Data fitting method based on signal-to-background ratio(S/B) is Less susceptible to matrix elements and background spectrum etc,and provides data processing reference for real-time online LIBS quantitative analysis technology.

胡丽, 赵南京, 刘文清, 方丽, 张大海, 王寅, 孟德硕, 余洋, 马明俊. 基于信背比拟合的水体重金属LIBS定量分析研究[J]. 光谱学与光谱分析, 2015, 35(7): 2017. HU Li, ZHAO Nan-jing, LIU Wen-qing, FANG Li, ZHANG Da-hai, WANG Yin, MENG De-shuo, YU Yang, MA Ming-jun. Quantitative Analysis of Heavy Metals in Water with LIBS Based on Signal-to-Background Ratio[J]. Spectroscopy and Spectral Analysis, 2015, 35(7): 2017.

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