钾元素单脉冲和双脉冲激光诱导击穿光谱研究  

Study on K single pulse-and double pulse-Laser induced breakdown spectroscopy

作　　者：张巧[1] 胡振华[1] 丁蕾[1] 王颖萍[1] 郑海洋[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所环境光谱学研究室,合肥230031

出　　处：《原子与分子物理学报》2013年第6期945-953,共9页Journal of Atomic and Molecular Physics

基　　金：中国科学院合肥物质科学研究院院长基金(Y03AG21136)

摘　　要：基于自行研制的新型液体射流的激光诱导击穿光谱(LIBS)实验装置,研究了实验条件(如积分延时、脉冲间隔、激光能量等)对K元素单脉冲LIBS和双脉冲LIBS等离子体发射的影响.实验得知相对单脉冲激光激发,双脉冲激光激发可以显著提高等离子体发射谱线强度,增加谱线强度的衰减时间,提高LIBS数据的稳定性.通过最佳实验条件下K766.49nm谱线强度随溶液浓度的分析,得到该实验系统中,双脉冲激光激发时K元素的检测灵敏度和检测限约是单脉冲激光激发时的37倍.实验结果为双脉冲LIBS技术应用于水体金属的检测提供了一定依据.The effects of the experimental conditions （integration delay time,inter pulse delay time, laser energy and so on） on the KC1 SP-LIBS（single pulse laser induced breakdown spectroscopy） and DP-LIBS （double pulse laser induced breakdown spectroscopy） were investigated using a self-developed new liquid jet. The intensity of line emission, time of line intensity-decay and LIBS stability were enhanced in DP- LIBS than SP-LIBS. It is found that the sensitivity and limit of detection （LOD） of K in DP-LIBS are 37 times those in SP-LIBS by curving the K 766.49nm spectra mean intensity with K metal concentration. The experimental results provide some basis for double pulse LIBS technique applying to the detection metallic elements in liquid.

关 键 词：激光诱导击穿等离子发射光谱 单脉冲激光 双脉冲激光 检测限 

分 类 号：O433[机械工程—光学工程]