激光诱导击穿光谱用于煤中多元素同步检测

Simultaneous detection of multi-elements in coal based on laser-induced breakdown spectroscopy

为了实现煤中碳、氢、硫3种非金属元素的快速同步定量检测,采用激光诱导击穿光谱技术,以波长1064nm的Nd∶YAG固体激光器作为激发源,在空气环境下烧蚀9种煤国家标准样品,选取188.885nm^308.008nm和655nm^660nm波长范围光谱,结合偏最小二乘回归,同步检测煤中C,H,S 3种非金属元素,取得了偏最小二乘回归的校正模型和预测模型数据,并进行了理论分析和实验验证。结果表明,C,H,S元素的预测质量分数与真实质量分数的决定系数为0.9421,0.9894,0.9840,预测均方根误差分别为2.2772,0.2356,0.1678,平均相对误差分别为2.6348%,7.1185%,8.8600%。该研究证明了激光诱导击穿光谱技术结合偏最小二乘回归定量可用于煤中非金属元素的多元素检测。

In order to achieve rapid and simultaneous quantitative detection of C,H,S in coal,laser-induced breakdown spectroscopy(LIBS)was used.A Nd∶YAG solid-state laser with wavelength of 1064nm was used as excitation source.Nine kinds of national standard coal samples were ablated in air environment.Combined with partial least squares regression,the spectrum with wavelength ranges of 188.885nm^308.008nm and 655nm^660nm were selected to detect C,H and S non-metallic elements in coal simultaneously.The correction model and prediction model data of partial least squares regression were obtained.The theoretical analysis and experimental verification were carried out.The results show that,determination coefficients R 2 of the predicted and real concentrations of C,H and S are 0.9421,0.9894 and 0.9840.Root mean square error of calibration is 2.2772,0.2356 and 0.1678.Average relative error is 2.6348%,7.1185%and 8.8600%.LIBS combined with partial least squares regression can be used to quantitatively detect non-metallic elements in coal.