Tan Bing, Huang Min, Zhu Qibing, Guo Ya, Qin Jianwei
Appl Opt. 2017 Sep 1;56(25):7116-7122. doi: 10.1364/AO.56.007116.
The laser induced breakdown spectroscopy (LIBS) technique is an effective method to detect material composition by obtaining the plasma emission spectrum. The overlapping peaks in the spectrum are a fundamental problem in the qualitative and quantitative analysis of LIBS. Based on a curve fitting method, this paper studies an error compensation method to achieve the decomposition and correction of overlapping peaks. The vital step is that the fitting residual is fed back to the overlapping peaks and performs multiple curve fitting processes to obtain a lower residual result. For the quantitative experiments of Cu, the Cu-Fe overlapping peaks in the range of 321-327 nm obtained from the LIBS spectrum of five different concentrations of CuSO·5HO solution were decomposed and corrected using curve fitting and error compensation methods. Compared with the curve fitting method, the error compensation reduced the fitting residual about 18.12-32.64% and improved the correlation about 0.86-1.82%. Then, the calibration curve between the intensity and concentration of the Cu was established. It can be seen that the error compensation method exhibits a higher linear correlation between the intensity and concentration of Cu, which can be applied to the decomposition and correction of overlapping peaks in the LIBS spectrum.
激光诱导击穿光谱（LIBS）技术是一种通过获取等离子体发射光谱来检测材料成分的有效方法。光谱中的重叠峰是LIBS定性和定量分析中的一个基本问题。基于曲线拟合方法，本文研究了一种误差补偿方法，以实现重叠峰的分解和校正。关键步骤是将拟合残差反馈到重叠峰，并进行多次曲线拟合过程，以获得较低的残差结果。对于铜的定量实验，使用曲线拟合和误差补偿方法对从五种不同浓度的CuSO·5HO溶液的LIBS光谱中获得的321-327nm范围内的铜-铁重叠峰进行了分解和校正。与曲线拟合方法相比，误差补偿使拟合残差降低了约18.12-32.64%，相关性提高了约0.86-1.82%。然后，建立了铜的强度与浓度之间的校准曲线。可以看出，误差补偿方法在铜的强度与浓度之间表现出更高的线性相关性，可应用于LIBS光谱中重叠峰的分解和校正。
