基于腔体约束激光诱导击穿铝土矿光谱的参数优化  

Parameter optimization of laser-induced breakdown bauxite spectra based on cavity confinement

作　　者：杨彦伟 郝晓剑[1,2,3] 潘保武 张瑞忠[1,2,3] 刘烨坤 孙鹏 郝文渊 Yang Yanwei;Hao Xiaojian;Pan Baowu;Zhang Ruizhong;Liu Yekun;Sun Peng;Hao Wenyuan(Key Laboratory of Instrumentation Science and Dynamic Measurement,Ministry of Education,North University of China,Taiyuan 030051,China;Department of Physics,Lvliang University,Lvliang 033000,China;Shanxi Huaxing Aluminum Industry Co.Ltd.,Lvliang 033603,China)

机构地区：[1]中北大学仪器科学与动态测试教育部重点实验室,山西太原030051 [2]吕梁学院物理系,山西吕梁033000 [3]山西华兴铝业有限公司,山西吕梁033603

出　　处：《红外与激光工程》2022年第3期241-247,共7页Infrared and Laser Engineering

基　　金：国家自然科学基金(52075504);量子光学与光量子器件国家重点实验室开放课题(KF201907);山西省自然科学基金(201901D111162);广东省电子功能材料与器件重点实验室2020年开放基金(EFMD2020001Z);2020年山西省高等学校科技创新项目(2020 L0677);山西省“1331工程”重点学科建设计划经费资助。

摘　　要：基于外加腔体约束方法,对铝土矿中Al、Si两种元素的激光诱导击穿光谱(LIBS)实验参数进行了优化研究。通过设置压强、激光能量、延迟时间等参数,使用传统LIBS和外加腔体约束LIBS(CC-LIBS)分别对铝土矿样品进行激光烧蚀,选择SiⅠ288.15 nm和AlⅠ308.21 nm作为特征谱线对最优实验条件进行了分析。结果表明:压强为150 MPa时,谱线强度偏差最小;能量为80 mJ时,采集到的特征谱线信噪比(SNR)最大;延迟时间为1μs时,Al、Si两种元素得到的SNR最优,从而确定了最佳实验条件。与传统的LIBS相比,CC-LIBS采集到的特征谱线强度、SNR都有所提高,为铝土矿中Al、Si元素的检测提供了新的实验依据与思路,具有一定的参考价值。Based on the external cavity constraint method, the experimental parameters of laser induced breakdown spectroscopy(LIBS) of Al and Si in bauxite were optimized. By setting the pressure, laser energy,delay time and other parameters, traditional LIBS and external cavity constrained LIBS(CC-LIBS) were used to ablate bauxite samples. The optimal experimental conditions were analyzed by selecting SiⅠ288.15 nm and AlⅠ308.21 nm as the characteristic spectrum. The results show that: when the pressure is 150 MPa, the deviation of the spectral line intensity is the smallest;when the energy is 80 mJ, the collected characteristic spectral line SNR is the largest;when the delay time is 1 μs, the SNR obtained by the two elements of Al and Si is the best, the optimal experiment condition is determined. Compared with traditional LIBS, the characteristic spectral line intensity and SNR collected by CC-LIBS have been improved, which provides new experimental basis and ideas for the detection of Al and Si elements in bauxite and has certain reference value.

关 键 词：外加腔体约束 激光诱导击穿光谱 铝土矿 信噪比 延迟时间 

分 类 号：O433.4[机械工程—光学工程]