在液体射流条件下，研究了Ca元素的双脉冲激光的激光诱导击穿光谱(LIBS)，实验考察了积分延时、激光脉冲间隔等参数对Ca等离子体发射强度的影响。发现双脉冲激光作用时，Ca元素的等离子体发射强度明显增强，激光脉冲间隔对等离子体发射谱线强度影响很大，间隔为0.4 μs左右的双脉冲激光作用可以使Ca等离子体发射谱线强度达到最大，并且此时的等离子体发射时间明显增长，通过优化实验参数后对不同浓度下LIBS信号的探测分析，发现相比单脉冲激光作用时，间隔为0.4 μs的双脉冲激光作用使Ca元素检测灵敏度提高了约5倍，实验所得结果为双脉冲LIBS技术对于液体中金属元素含量检测提供了依据。

Dual pulse laser-induced breakdown spectroscopy (LIBS) of Ca is studied in liquid jet. The influence of the experimental conditions, including delay of integration, inter pulse delay, on the emission intensity is investigated. It is found that Ca plasma emission intensity is greatly enhanced and the inter pulsed delay time has a great impaction of emission intensity, and there is a maximum around 0.4 μs. And at this time, plasma emission time is apparently longer in dual pulse excitation than that in single pulse excitation mode. Then the calibration curves of Ca elements with different concentrations in the liquid are acquired. The limit of detection in dual pulse laser with 0.4 μs interval excitation mode is about 5 times lower than that in single pulse. The results offer feasibility and basis for the detection of metallic elements in liquid by dual pulse-LIBS.