【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.更多还原

【Abstract】 The effects of the experimental conditions(integration delay time,inter pulse delay time,laser energy and so on)on the KCl 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 DPLIBS than SP-LIBS.It is found that the sensitivity and limit of detection(LOD)of K in DP-LIBS are 37times 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.更多还原