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激光干涉法诊断空气开关等离子体的技术研究

Methods for Diagnosing Air Switch Plasma via Laser Interferometry

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摘要

介绍了激光干涉技术用于诊断等离子体的基本原理、实验装置及图像处理方法等, 通过Mach-Zehnder激光干涉仪诊断了空气开关等离子体。结果表明, 该实验装置能够获得高质量的干涉图。通过对干涉图的数值处理, 重建了等离子体电子密度的三维分布。空气开关放电后75 ns时刻, 等离子体的平均电子密度为2×1018 cm-3, 电子温度为0.11 eV, 等离子体半径为1.1 mm, 扩散速度为1.4×104 m/s。

Abstract

Herein, a technique for plasma diagnosis via laser interference is described in terms of basic principles, experimental setup, and image-processing methods. Air-switch plasma is diagnosed using a Mach-Zehnder laser interferometer. The results show that the experimental device can record high-quality interferograms. Through numerical processing of these interferograms, the three-dimensional electron density distribution in plasma is reconstructed. After the air switch is ignited for 75 ns, the average electron density in plasma reaches 2×1018 cm-3, the electron temperature is 0.11 eV, the plasma radius is 1.1 mm, and the diffusion velocity is 1.4×104 m/s.

Newport宣传-MKS新实验室计划
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中图分类号:O53

DOI:10.3788/aos201939.0512003

所属栏目:仪器,测量与计量

收稿日期:2018-11-23

修改稿日期:2018-12-18

网络出版日期:2019-01-23

作者单位    点击查看

黄杰:北京师范大学核科学与技术学院北京市辐射中心, 北京 100875中国工程物理研究院电子工程研究所, 四川 绵阳 621900
杨林:中国工程物理研究院电子工程研究所, 四川 绵阳 621900
陈磊:中国工程物理研究院电子工程研究所, 四川 绵阳 621900
吴先映:北京师范大学核科学与技术学院北京市辐射中心, 北京 100875

联系人作者:杨林(fuyunyufeng@163.com)

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引用该论文

Huang Jie,Yang Lin,Chen Lei,Wu Xianying. Methods for Diagnosing Air Switch Plasma via Laser Interferometry[J]. Acta Optica Sinica, 2019, 39(5): 0512003

黄杰,杨林,陈磊,吴先映. 激光干涉法诊断空气开关等离子体的技术研究[J]. 光学学报, 2019, 39(5): 0512003

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