激光诱导土壤等离子体光谱辐射实验参数优化（英文）  

Optimization of experimental parameters of laser induced soil plasma spectral radiation

作　　者：王金梅[1] 颜海英 郑培超[1] 薛淑文 Wang Jinmei;Yan Haiying;Zheng Peichao;Xue Shuwen(Chongqing Municipal Level Key Laboratory of Photoelectronic Information Sensing and Transmitting Technology,College of Optoelectronic Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学光电工程学院光电信息感测与传输技术重庆重点实验室,重庆400065

出　　处：《红外与激光工程》2018年第12期66-72,共7页Infrared and Laser Engineering

基　　金：重庆市基础科学与前沿技术研究专项项目重点项目(cstc2015jcyjBX0016);重庆市基础科学与前沿技术研究专项项目一般项目(cstc2016jcyjA0389);重庆市教委科学研究项目(KJ1500436);教育部留学回国人员科研启动基金(教外司留[2015]1098号);重庆邮电大学博士基金(A2016-113)

摘　　要：采用激光诱导击穿光谱法(LIBS)对土壤进行了研究。激光器采用的是Nd:YAG脉冲激光器,激光器的输出波长是1 064 nm,脉宽是5.82 ns,激光聚焦在土壤表面产生激光诱导等离子体,通过优化实验参数(ICCD延时、脉冲能量、ICCD门宽、脉冲频率、谱图积累次数)对Ca II 393.37 nm和Ca II 396.37 nm两条特征谱线强度及信背比的影响,确定实验最佳条件是ICCD延时1μs,激光能量50 m J,ICCD门宽3.5μs,脉冲频率1 Hz,谱图积累次数100次。在最优实验条件下计算等离子体参数,得出土壤中的等离子体电子温度是11 604 K,土壤的等离子体电子密度是5.155×1016 cm-3,经过计算,土壤样品满足LTE条件。这说明,以上关于土壤样品的等离子体参数计算结果是真实有效的。Laser induced breakdown spectroscopy(LIBS)was employed to investigate the soil.LIBS analyses were performed with Nd:YAG laser operating at1064nm,5.82ns pulse duration.The spectral lines of Ca II393.37nm and Ca II396.85nm were selected as the analytical lines for optimizing the experimental parameters(ICCD delay,laser energy,ICCD gate width,repetition rate and cumulative number of spectrum)which had influence on spectral line.The experimental conditions were determined as follows.The ICCD delay was1μs,the laser energy was50mJ,the ICCD gate width was3.5μs,the repetition rate was1Hz and the cumulative number of spectrum was100times.Under the optimal experimental conditions,the results of the electron temperatures Te and electron densities Ne were11604K and5.155×10^16cm^-3,respectively.The local thermal equilibrium condition of the plasma was satisfied.The results are useful for the analysis and detection of elements in soil.

关 键 词：激光诱导击穿光谱 序贯试验法 土壤 电子温度 电子密度 

分 类 号：O433.4[机械工程—光学工程] TN249[理学—光学]