基于DP-LIBS铁合金中碳元素特征谱线的研究

Study on spectrum characteristic of carbon in iron alloy based on DP-LIBS

采用双脉冲和单脉冲激光,对空气中标准铁合金样品中碳元素的激光诱导实验,研究两种方式下形成的光谱。双脉冲激光诱导击穿光谱采用两束激光,在第一束激光脉冲的基础上加入第二束高压激光脉冲,对等离子体进行二次激发。通过对比研究发现:双脉冲激发技术延长了原子特征辐射的有效时间,提高了获取信号的信噪比,增强了发射光谱的信号强度,提高了信号的稳定性。此外,通过分析影响双脉冲信号增强程度的因素,研究了脉冲宽度和延迟时间以及激发能级对光谱增强程度的影响。

By adopting double pulses and single pulse laser,laser induced experiments were done for carbon of standard iron alloy samples in the air,and the spectrum obtained in those experiments were compared. Double pulses laser induced breakdown spectroscopy uses two laser beams. On the basis of the first laser pulse,a second laser pulse with high voltage was added,and secondary excitation was carried out for plasma. The comparison results show that double pulse excitation technique can extend the effective time of the feature atomic radiation,improve the SNR of the signal,enhance the signal strength of the emission spectrum,and improve the stability of the signal. In addition,by analyzing the factors that influence the extent of enhancement of the double pulses signal,the influence of the pulse width,delay time,and the excitation stage on enhancement extent of spectrum is also studied.