为将LIBS技术应用于核材料的监测分析,采用波长为1064 nm的脉冲激光诱导产生等离子体光谱,利用多通道光栅光谱仪完成光信号的探测,系统研究了不同实验参数对光谱特性的影响。选用氧化铈的特征谱线Ce I 500.91 nm、Ce II 446.02 nm进行分析。实验结果表明:靶点位置、激光聚焦位置到透镜的距离、激发能量及延迟时间对氧化铈LIBS信号均有较大影响。通过优化各实验参数可以获得较高的光谱强度和较高的信背比,确定了LIBS技术用于氧化铈分析的最佳实验条件,为后续进一步开展氧化钚成分分析提供了数据参考。

In order to apply laser-induced breakdown spectroscopy (LIBS) into the monitoring and analysis of nuclear materials, we use pulsed laser with wavelength of 1064 nm to induce the plasma spectrum in the experiment, detect the optical signal using multi-channel grating spectrometer, and study the effects of different experimental parameters on the spectral property. The characteristic spectral lines Ce I 500.91 nm and Ce II 446.02 nm are chosen for analysis. The experimental results show that the experimental parameters such as the target position, the distance of the focusing lens to the samples, the excitation energy and the delay time have great influence on the LIBS signal of cerium oxide. High spectral intensity and signal-background ratio are obtained by the optimization of these experimental parameters, and the optimum experimental conditions for the analysis of cerium oxide by LIBS technology are determined, which provide some data reference for the future study of component analysis of plutonium oxide.