将激光烧蚀与吸收光谱技术结合,搭建一套激光烧蚀吸收光谱实验测量装置。将合金钢作为待测样品,选择铝原子的基态跃迁(394.40 nm)作为分析谱线,开展合金钢中铝元素的定量检测与分析实验。实验结果表明,在激光脉冲能量为30 mJ、探测高度为2 mm及采样延迟时间为8 μs的实验条件下,较为适宜对合金钢中不同含量铝元素进行定量检测与分析。在优化的实验条件下,获得合金钢标准样品中铝原子的高分辨率和灵敏度吸收光谱信号,并建立铝含量与吸收强度的定标曲线。定标曲线的拟合相关参数优于0.999,检测限为0.066%。研究结果证明激光烧蚀吸收光谱技术在合金钢中铝元素定量分析方面的可行性,以及在合金钢及其他材料中痕量元素和同位素定量分析方面具有巨大潜力。

A set of experimental measuring devices is developed by combining the laser ablation technique with absorption spectroscopy to obtain laser ablation absorption spectra. Alloy steel is used as the test sample, and the ground state transition (394.40 nm) of the aluminum atoms is selected as the analytical spectral line for the quantitative detection and analysis experiment of aluminum in the alloy steel samples. The experimental results reveal that the most suitable experimental conditions for the successful detection and analysis of aluminum include a laser pulse energy of 30 mJ, a detection height of 2 mm, and a sampling delay time of 8 μs. Under these optimized conditions, the high-resolution and high-sensitivity absorption spectrum signals of the aluminum atoms in the alloy steel standard samples are obtained, while the calibration curve of the aluminum content and absorption intensity are also determined. Moreover, the fitting parameters of the calibration curve are higher than 0.999, and the limit of detection is 0.066%. Thus, laser ablation absorption spectroscopy proves to be effective for the quantitative analysis of aluminum in alloy steel, while the results also indicate its great potential for the quantitative analysis of trace elements and isotopes in alloy steel and other materials.