光谱学与光谱分析, 2018, 38 (5): 1552, 网络出版: 2018-06-01
铁合金中微量钛元素的激光诱导击穿光谱研究
Trace Titanium in Ferroalloy Studied by the Laser Induced Breakdown Spectroscopy
激光诱导击穿光谱 铁合金 钛元素 内标法 局部热平衡态 Laser induced breakdown spectroscopy Ferroalloy Titanium element Internal standard method Local thermodynamic equilibrium
摘要
采用激光诱导击穿光谱对铁(Fe)合金中的钛元素(Ti)的含量进行测量。 实验中激光器在最大能量输出(50 mJ), 延时为1 μs时光谱信号的强度值最大。 在此条件下, 分别使用传统定标法和Fe Ⅰ 43835 nm及Fe Ⅰ 42712 nm两条谱线的内标法对铁合金中的Ti进行定量分析。 内标法得到的拟合相关系数(r)分别为0997 8和0993 9, 优于传统法得到的r(0956 3)。 提出了一种双谱线平均内标法, 拟合得出r为0998 4。 同时, 在浓度为0063%~19%的范围内传统定标法测量的相对误差为237%, 内标法的相对误差为60%, 采用平均内标法后相对误差降为39%。 最后, 通过测量的Ti光谱计算了激光能量为50 mJ时所产生的等离子体温度为6 6543 K, 电子密度为1072×1022 cm-3, 并讨论了激光能量与烧蚀产生等离子体温度之间的关系。
Abstract
The concentration of titanium element in the ferroalloys was measured by laser induced breakdown spectroscopy. The maximum spectral signals were observed at the output energy of pulse laser at 50 mJ and the delay at 1 μs. Under this circumstance, traditional calibration method (TCM) and internal standard method (ISM) with Fe Ⅰ 43835 nm and Fe Ⅰ 42712 nm lines were used to quantitatively analyze the Ti in iron alloy. The fitting correlation coefficients (r) of ISM were 0997 8 and 0993 9 for Fe Ⅰ 43835 nm and Fe Ⅰ 42712 nm respectively, higher than that of TCM (0956 3). This paper presented a double-line average internal standard method and resulted in 0998 4 for r. In the range of Ti concentration from 0063% to 19%, the relative errors were 237% and 60% for the TCM and ISM respectively. However, the relative error was reduced to 39% by the double-line average internal standard method. In addition, the temperature of plasma Ti was 6 6543 K and the electron density was 1072×1022 cm-3 through calculating the obtaining lines of Ti at the laser energy of 50 mJ. Furthermore, the relationship between the laser energy and the plasma temperature was discussed in the paper.
贾皓月, 李传亮, 阴旭梅, 周锐, 邱选兵, 杨雯, 李坤, 王高, 魏计林. 铁合金中微量钛元素的激光诱导击穿光谱研究[J]. 光谱学与光谱分析, 2018, 38(5): 1552. JIA Hao-yue, LI Chuang-liang, YIN Xu-mei, ZHOU Rui, QIU Xuan-bing, YANG Wen, LI Kun, WANG Gao, WEI Ji-lin. Trace Titanium in Ferroalloy Studied by the Laser Induced Breakdown Spectroscopy[J]. Spectroscopy and Spectral Analysis, 2018, 38(5): 1552.