使用单脉冲和再加热双脉冲激光对位于空气中的钢样进行烧蚀激发等离子体，对两种方式产生的光谱进行研究。再加热双脉冲激光诱导击穿光谱采用两束激光，一束烧蚀样品激发等离子体，另外一束激光对产生的等离子进行加热。通过对比发现：采用再加热双脉冲激发样品，增强了发射光谱的信号，增大了等离子体的连续光谱，提高了信号的稳定性，十次测量信号的相对标准偏差从5.0%降低到2.0%。另外，还对影响双脉冲信号增强程度的因素进行了分析，研究了光谱的增强程度随两脉冲间隔和采集延时的变化；激发上能级对光谱增强程度的影响,上能级越高增强程度越大。

Plasma of steel sample is produced by single and reheating double pulses laser-induced breakdown spectroscopy in air, and the spectrum excited by two ways is studied. Two lasers are used in reheating double pulses laser-induced breakdown spectroscopy. One arm is used to ablate samples to produce plasma; while the other arm is reheat to the produced plasma. Through comparison of reheating double pulses and single laser on steel sample show that intensity of emission spectrum is enhanced; signal of continuous spectrum is amplified; Signal repeatability is improved using reheating double pulses excitation, the measured signal relative standard deviation is decreased from 5.0% to 2.0% by ten times. In addition, the factor affecting signal enhancement is presented and discussed. The signal enhancement level with the delay between two pulses and the acquisition delay are also investigated. At the same time, an additional research issue to be tackled is the effect of the increasing influenced by excitation energy levels. The higher the excitation energy levels are, the more the enhancements are.