The influence of different defocusing and delay time parameters on the characteristics of laser-induced breakdown spectroscopy and the effect of self-absorption
1. School of Physics and Electronic-information Engineering, Hubei Engineering University, Xiaogan 432000, China; 2. Faculty of Physics and Electronic Sciences, Hubei University, Wuhan 430062, China
Abstract：In order to improve the accuracy of trace elements quantitative analysis and reduce the interference of spectral line self-absorption effect for laser-induced breakdown spectroscopy (LIBS), Mn in pig iron CRM from Pangang Group was taken as the research object to explore the characteristics of laser-induced breakdown spectroscopy and the variation law of self-absorption effect with the parameters of different defocusing and delay time. The optimal defocusing and delay time were obtained by analyzing the change trends of plasma spectral intensity, plasma temperature, determination coefficient R2 of calibration curve and self-absorption coefficient under different defocusing and delay time. The results showed that the determination coefficient R2 of the calibration curve generally decreased with the increasing of delay time. While, it increased sharply at first and then decreased slowly with the increasing of defocusing, which reached a maximal value of 0.9988 at defocusing of -2.5mm. The self-absorption coefficient decreased gradually with the increasing of delay time. While, it increased first and then decreased with the increasing of defocusing, which reached a minimal value of -3.75mm. The optimal delay time was about 2μs and the optimal defocusing was within -2.5--3.75mm. The results showed that the self-absorption effect could be reduced and the accuracy of quantitative analysis could be improved in some degree by adjusting and optimizing the system parameters. This experiment provided a new approach and reference basis for exploring the influence of system parameters on the characteristics of laser induced breakdown spectroscopy and the self-absorption effect.
袁梦甜, 陈光辉, 程敏佳, 康柳, 曾庆栋, 余华清. 不同离焦量延时时间参数对激光诱导击穿光谱特征及自吸收效应的影响[J]. 冶金分析, 2020, 40(12): 51-58.
YUAN Meng-tian, CHEN Guang-hui, CHENG Min-jia, KANG Liu, ZENG Qing-dong, YU Hua-qing. The influence of different defocusing and delay time parameters on the characteristics of laser-induced breakdown spectroscopy and the effect of self-absorption. , 2020, 40(12): 51-58.
王卿,谭娟,吴健,等.激光诱导击穿光谱技术在环境领域中的应用动态[J].中国环境监测,2015,31(3):123-131.WANG Qing,TAN Juan,WU Jian,et al.Application progress of laser induced breakdown spectroscopy in the field of environment[J].Environmental Monitoring in China,2015,31(3):123-131.
[2]
尹华亮,侯宗余,袁廷璧,等.激光诱导击穿光谱技术在环境监测中的应用综述[J].大气与环境光学学报,2016,11(5):322-337.YIN Hu-liang,HOU Zong-yu,YUAN Ting-bi,et al.Application review of laser-induced breakdown spectroscopy in environmental monitoring[J].Journal of Atmospheric and Environmental Optics,2016,11(5):322-337.
[3]
刘丹瑶.激光诱导击穿光谱分析仪在冶金样品检测领域的应用[J].冶金管理,2020(1):57-58.LIU Dan-yao.Application of laser-induced breakdown spectroscopy analyzer in the field of metallurgical sample detection[J].Metallurgical Management,2020(1):57-58.
[4]
张天龙.激光诱导击穿光谱中化学计量学方法研究及其在冶金分析的应用[D].西安:西北大学,2015.
[5]
Rapin W,Meslin P Y,Maurice S,et al.Quantification of water content by laser induced breakdown spectroscopy on Mars[J].Spectrochimica Acta Part B:Atomic Spectroscopy,2017(130):82-100.
[6]
舒嵘,徐卫明,付中梁,等.深空探测中的激光诱导击穿光谱探测仪[J].深空探测学报,2018,5(5):450-457.SHU Rong,XU Wei-ming,FU Zhong-liang,et al.Laser induced breakdown spectroscopy detector in deep space exploration[J].Journal of Deep Space Exploration,2018,5(5):450-457.
卢芳琴,史彦超,王逢睿,等.利用激光诱导击穿光谱分析法检测古建筑砖瓦成分[J].广州化工,2018,46(9):80-82.LU Fang-qin,SHI Yan-chao,WANG Feng-rui,et al.Element analysis of blue brick and tile of ancient architecture with laser-induced breakdown spectroscopy[J].Guangzhou Chemical Industry,2018,46(9):80-82.
[10]
闫梦鸽.LIBS光谱识别典型岩石水风化物方法研究[D].济南:山东大学,2019.
[11]
胡慧琴,姚明印,涂建平,等.水中重金属元素镉的激光诱导击穿光谱快速检测研究[J].江西农业大学学报,2015,37(2):359-362.HU Hui-qin,YAO Ming-yin,TU Jian-ping,et al.Detection of Cd in water by laser-induced breakdown spectroscopy[J].Journal of Jiangxi Agricultural University,2015,37(2):359-362.
[12]
常鹏飞,王静鸽,仵祎,等.载玻片的激光诱导击穿光谱实验关键参数优化[J].激光与光电子学进展,2019,56(22):223-229.CHANG Peng-fei,WANG Jing-ge,WU Yi,et al.Optimizing key experimental parameters for laser-induced breakdown spectroscopy of slides[J].Laser and Optoelectronics Progress,2019,56(22):223-229.
[13]
李乘,姚关心,杨新艳,等.液相基质激光诱导击穿光谱的关键实验参数优化[J].激光与光电子学进展,2019,56(7):292-297.LI Cheng,YAO Guan-xin,YANG Xin-yan,et al.Key experimental parameter optimization for laser induced breakdown spectroscopy of liquid matrix[J].Laser and Optoelectronics Progress,2019,56(7):292-297.
[14]
王方仪,张少华,余西龙.ADN基液体推进剂激光诱导等离子体的光谱研究[J].气体物理,2020,5(2):38-46.WANG Fang-yi,ZHANG Shao-hua,YU Xi-long.Spectroscopic study of plasma generated by laser-induced breakdown of ADN-based propellant[J].Physics of Gases,2020,5(2):38-46.
[15]
孙贯成,刘欢欢,李永大.激光诱导Ni等离子体电子温度与电子密度的时空演化特性研究[J].激光与红外,2010,40(9):941-944.SUN Guan-cheng,LIU Huan-huan,LI Yong-da.Research on space-time evolving feature of laser-induced Ni plasma′s electron temperature and electron density[J].Laser & Infrared,2010,40(9):941-944.
[16]
HAO Z Q,LIU L,SHEN M,et al.Investigation on self-absorption at reduced air pressure in quantitative analysis using laser-induced breakdown spectroscopy[J].Optics Express,2016,24(23):26521-26528.
