| 大气颗粒物中重金属的双脉冲激光诱导击穿光谱研究 |
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| 引用本文： | 李业秋,孙成林,李倩,岱钦,乌日娜,张善春,杨帆,乔红超. 大气颗粒物中重金属的双脉冲激光诱导击穿光谱研究[J]. 红外与激光工程, 2019, 48(10): 1005006-1005006(6). DOI: 10.3788/IRLA201948.1005006 |
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| 作者姓名： | 李业秋 孙成林 李倩 岱钦 乌日娜 张善春 杨帆 乔红超 |
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| 作者单位： | 1.沈阳理工大学 理学院,辽宁 沈阳 110159; |
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| 基金项目： | 国家自然科学基金（61705145，51501219）;国家基金委辽宁省联合基金（U1608259）;辽宁省高等学校创新人才支持计划（LR2016079）;辽宁省自然科学基金项目（20180550330）; |
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| 摘 要： | 为了对沈阳市某工业区附近大气中重金属等离子体光谱特性进行研究，采用双脉冲激光诱导击穿光谱技术（Double pulse laser induced breakdown spectroscopy，DP-LIBS）对样品中主要重金属等离子体光谱进行测量分析。通过比较单脉冲（SP）和双脉冲（DP）激发的样品等离子体光谱，发现采用DP-LIBS技术可以很好地增强等离子体光谱的强度。研究DP-LIBS光谱强度随两个脉冲激光的间隔时间变化，在脉冲间隔为15 s时样品中重金属等离子体光谱得到了最大的增强。同时DP-LIBS技术也会提高样品等离子体光谱的稳定性，谱线的相对标准偏差由6%降低为3%左右。最后对样品等离子体的电子温度及电子密度随双脉冲间隔时间的变化情况进行了研究。
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| 关 键 词： | 激光诱导等离子体 双脉冲激光 脉冲间隔时间 大气重金属 |
| 收稿时间： | 2019-06-11 |
Analysis of the heavy metals in atmospheric particulate matter using dual-pulsed laser-induced breakdown spectroscopy |
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| Affiliation: | 1.College of Science,Shenyang Ligong University,Shenyang 110159,China;2.Coherent Light and Atomic and Molecular Spectroscopy Laboratory,Jilin University,Changchun 130012,China;3.Shenyang Institute of Automation,Chinese Academy of Sciences,Shenyang 110016,China |
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| Abstract: | In order to study the spectral characteristics of heavy metal plasma in the atmosphere near an industrial zone in Shenyang, double pulse laser-induced breakdown spectroscopy (DP-LIBS) was used to measure and analyze the characteristics of main heavy metal laser-induced breakdown spectra in the atmosphere. By comparing the plasma spectrum of samples excited by single pulse (SP) and double pulse (DP). It was found that DP-LIBS can enhance the intensity of plasma spectrum. The DP-LIBS spectral intensity with the interval time of two pulsed lasers was studied, and the maximum enhancement of the heavy metal plasma spectrum was obtained when the pulse interval was 15 s. At the same time, the DP-LIBSs technology will also improve the stability of the sample plasma spectrum, and the relative standard deviation of the spectrum line will be reduced from 6% to about 3%. Finally, the changes of electron temperature and electron density with the time interval of double pulse were studied. |
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