中国激光, 2018, 45 (7): 0702006, 网络出版: 2018-09-11
正交再加热双脉冲激光诱导黄连等离子体的光谱特性 下载: 848次
Spectral Characteristics of Coptis Chinensis Plasma Induced by Orthogonal Re-Heating Double-Pulse Laser
激光技术 激光诱导击穿光谱(LIBS) 光谱增强 再加热双脉冲 中药材 电子激发温度 电子数密度 laser technique laser-induced breakdown spectroscopy (LIBS) spectral enhancement re-heating double pulse Chinese herbal medicines electron excitation temperature electron number density
摘要
搭建了正交的再加热双脉冲激光诱导击穿光谱(RDP-LIBS)实验装置。以黄连为研究对象,用其特征谱线的光谱强度和信背比评估了光谱特性。通过优化探测延时、两束激光能量值组合及脉冲间隔等实验参数,提高了检测的灵敏度。相比单脉冲激光诱导击穿光谱(SP-LIBS)技术,RDP-LIBS技术对4条特征谱线(Fe、Al、Ca、CN)的光谱强度增强倍数分别为4.0,5.5,10.0和3.5。RDP-LIBS下的等离子体电子激发温度和电子数密度均比SP-LIBS下的有所提高。
Abstract
An orthogonal re-heating double pulse laser-induced breakdown spectroscopy (RDP-LIBS) experimental setup is built. The Coptis Chinensis is selected as the research target and the spectral intensities and signal-to-background ratios of its characteristic spectral lines are used to evaluate the spectral characteristics. The detection sensibility is improved by the optimization of detection delay, the combination of two laser energy values, the pulse interval and other experimental parameters. Compared with those by the single pulse laser-induced breakdown spectroscopy (SP-LIBS) technique, the enhancement factor of spectral intensities by the RDP-LIBS technique for the four characteristic spectral lines of Fe, Al, Ca and CN are 4.0, 5.5, 10.0 and 3.5 times, respectively. The electron excitation temperature and the electron number density of plasma by the RDP-LIBS technique are both higher than those by the SP- LIBS technique.
王金梅, 郑慧娟, 郑培超, 谭癸宁. 正交再加热双脉冲激光诱导黄连等离子体的光谱特性[J]. 中国激光, 2018, 45(7): 0702006. Jinmei Wang, Huijuan Zheng, Peichao Zheng, Guining Tan. Spectral Characteristics of Coptis Chinensis Plasma Induced by Orthogonal Re-Heating Double-Pulse Laser[J]. Chinese Journal of Lasers, 2018, 45(7): 0702006.