The analytical sensitivity of conventional reheating orthogonal double-pulse laser-induced breakdown spectroscopy (ODP-LIBS) was improved using a solid target. In the experiments, the first laser was shot on the sample surface to produce sample plasma and the second time-delayed laser was shot on the target surface to produce target plasma. Sample and target were spatially arranged with orthogonal orientations. Through the interaction between target plasma and sample plasma, the optical emissions of the analytes can be enhanced significantly. To evaluate the analytical sensitivity improvement factor of this technique, copper and lead in water samples were quantitatively analyzed using wood slice as water absorber to realize matrix conversion. The detection limit of copper and lead in water determined with this technique using aluminum target was 49 ng/mL and 180 ng/mL, respectively. The enhancement factor in comparison with those obtained by ODP-LIBS without using target-enhancement was 4.5 and 3.8, respectively. This work demonstrates that the analytical sensitivity of ODP-LIBS can be obviously improved with target-enhancement.

使用固体靶提高了传统的再加热正交双脉冲激光诱导击穿光谱法（ODP-LIBS）的分析灵敏度。在实验中，第一激光照射在样品表面上以产生样品等离子体，而第二延时激光照射在目标表面上以产生靶等离子体。样品和目标在空间上以正交方向排列。通过目标血浆和样品血浆之间的相互作用，可以显着提高分析物的光发射。为了评估该技术的分析灵敏度提高因素，使用木片作为吸水剂对水中的铜和铅进行了定量分析，以实现基质转化。使用铝靶通过该技术测定的水中铜和铅的检出限分别为49 ng / mL和180 ng / mL。与不使用目标增强的ODP-LIBS获得的增强因子相比，增强因子分别为4.5和3.8。这项工作表明，通过增强目标可以明显提高ODP-LIBS的分析灵敏度。