光子学报 ›› 2018, Vol. 47 ›› Issue (8): 847004-0847004.doi: 10.3788/gzxb20184708.0847004

• “激光诱导击穿光谱”专题 • 上一篇    下一篇

水分含量对激光诱导岩屑等离子体特性的影响

贾军伟1,2, 佘明军3, 付洪波1, 王华东1,2, 倪志波1, 董凤忠1,2   

  1. 1. 中国科学院安徽光学精密机械研究所, 合肥 230031;
    2. 中国科学技术大学, 合肥 230026;
    3. 中石化中原石油工程有限公司录井公司, 河南 濮阳 457001
  • 收稿日期:2018-06-23 出版日期:2018-08-25 发布日期:2018-07-17
  • 通讯作者: 董凤忠(1966-),男,研究员,博导,主要研究方向为高灵敏气体在线检测、工业过程控制、光纤传感等.Email:fzdong@aiofm.ac.cn
  • 作者简介:贾军伟(1987-),男,博士研究生,主要研究方向为激光诱导击穿光谱技术、光谱分析.Email:jjw2014@mail.ustc.edu.cn
  • 基金资助:

    国家自然科学基金(Nos.61505223,41775128),中国科学院对外合作重点项目(No.GJHZ1726)和中国科学院知识创新工程(No.Y03RC21124)资助

Effect of Moisture Content on Laser-induced Rock Cuttings Plasma Properties

JIA Jun-wei1,2, SHE Ming-jun3, FU Hong-bo1, WANG Hua-dong1,2, NI Zhi-bo1, DONG Feng-zhong1,2   

  1. 1. Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Sciences, Chinese Academy of Sciences, Hefei 230031, China;
    2. University of Science and Technology of China, Hefei 230026, China;
    3. Mud Logging Company of Zhongyuan Petroleum Engineering Co., Ltd., Puyang, Henan 457001, China
  • Received:2018-06-23 Online:2018-08-25 Published:2018-07-17
  • Contact: 2018-07-17
  • Supported by:

    The National Natural Science Foundation of China (Nos. 61505223, 41775128), the External Cooperation Program of Chinese Academy of Science (No. GJHZ1726), the Knowledge Innovation Program of the Chinese Academy of Sciences (No. Y03RC21124)

摘要:

对制备的七种不同湿度的岩屑样品进行实验,研究了水分含量对激光诱导岩屑等离子体特性的影响以及不同水分含量下样品中各元素浓度值的修正方法.实验分析了Ca Ⅱ 422.67 nm谱线强度随岩屑样品含水量的变化,通过Ca Ⅱ和Al I各自四条谱线的玻尔兹曼图计算了不同水分含量下的等离子体平均温度,并使用Lorentz拟合Ca Ⅱ 422.67 nm谱线获得了不同水分含量岩屑等离子体的电子密度.实验结果表明,随着水分含量的增加,光谱强度、等离子体温度和电子密度均线性降低,各元素自由定标模型定量分析结果有较大差异,但不同水分含量的岩屑等离子体均满足局部热力学平衡的Mc Whirter标准,自由定标模型可以用于不同水分含量岩屑样品的分析及影响的简单修正.

关键词: 激光诱导击穿光谱, 岩屑, 电子密度, 热力学平衡, 水分含量, 等离子体温度

Abstract:

By preparing seven kinds of rock cutting samples with different moisture content, experiments were conducted to study the effect of moisture content on laser-induced rock cuttings plasma properties and the method for correcting the concentration of each element in different moisture content. The variation of the intensity of the Ca 422.67 nm line with the moisture content of the rock cutting samples was studied. The average plasma temperature under different moisture contents was calculated by the Boltzmann-plot of the four lines of Ca Ⅱ and Al I. The electron density of the plasma with different moisture contents was obtained by using Lorentz fitting of the Ca 422.67 nm line.The results show that with the increase of moisture content, the spectral intensity, plasma temperature, electron density all decrease linearly and there are also great differences in the quantitative analysis results of the calibration free models for each element, but the laser-induced cuttings plasma with different moisture content all meet the Mc Whirter criterion of local thermodynamic equilibrium and the calibration free model can be used for the analysis and simple correction of moisture content effects.

Key words: Rock cuttings, Moisture content, Local thermodynamic equilibrium, LIBS, Plasma temperature, Electron density

中图分类号: