基于纳秒Nd∶YAG激光器与卡塞格林式望远镜系统建立了一套25 m远距离激光诱导击穿光谱测量装置, 实现了对金属靶材的远距离测量.在此基础上, 利用铝合金标样开展了金属中微量元素远程定量分析, 研究了不同距离下铝合金中Pb、Fe、Ni三种元素的定量分析标定曲线与探测极限.实验结果表明, 在5 m至20 m三种测量距离下, Pb、Fe、Ni三种元素定标曲线的相关性系数均高于0.97; 尽管激光诱导击穿光谱的光谱信号随测量距离增加快速下降, 但是检测限随测量距离增加并无显著改变, 均在50 ppm以下.

A remote laser-induced breakdown spectroscopy device was constructed by combination a nanosecond Nd: YAG laser with a Cassegrain telescope. The distance of measurement can be up to 25 m. In addition, the quantitative analysis of micro elements, Pb, Fe and Ni, in the standard sample of aluminum alloy at different distances is studied. The experimental results show that the correlation coefficients of the calibration curves for Pb, Fe and Ni are all higher than 0.97 at the distances from 5 to 20 meters. Though the intensity of spectral signals decreased rapidly with distance, there was not significantly different of the limits of detection with the increase of measurement distance in our experiments.