为获得共线双脉冲激发方式对土壤中Pb和Ba元素的谱线增强效果, 研究了1064 nm单脉冲和(355 nm+ 1064 nm), (1064 nm+355 nm)共线双脉冲三种激发方式下, 谱线强度随采集延迟时间的变化规律和谱线增强倍数随双脉冲时间间隔的变化规律。研究发现, 与单脉冲激发方式相比, 在双脉冲激发方式下, 谱线Pb I 405.78 nm和Ba I 553.55 nm强度的最大增强倍数分别为5和8。该研究结果为检测土壤中重金属元素提供了参考。

In order to explore the enhancement effect of collinear dual-pulse excitation on the spectral intensity of Pb and Ba elements in soil, the variations of spectral intensity with the acquisition delay time and spectral enhancement times with the time interval of dual-pulses under the three excitation modes of 1064 nm single pulse, (355 nm+1064 nm) and (1064 nm+355 nm) collinear dual-pulses were studied. The results show that, compared to a single 1064 nm pulse, maximum enhancements by times of 5 for the Pb I 405.78 nm and 8 for the Ba I 553.55 nm were observed under the mode of dual-pulses. The results provide a reference for the detection of heavy metals in soil.