›› 2016, Vol. 36 ›› Issue (1): 94-102.doi: 10.3780/j.issn.1000-758X.2016.0016

• 技术交流 • 上一篇    下一篇

μ-PPT等离子体电子密度氢光谱诊断技术

 王尚民1, 张家良2,*, 张天平1, 冯杰1, 郑茂繁1, 黄永杰1   

  1. 1兰州空间技术物理研究所,兰州7300002大连理工大学,大连116024
  • 收稿日期:2015-11-12 修回日期:2015-12-10 出版日期:2016-02-25 发布日期:2016-02-24
  • 作者简介:王尚民(1986-),男,工程师,wangshangmin2008@163.com *张家良(1967-)男,教授,zhangjl@dlut.edu.cn,主要研究方向为电推进等离子体诊断
  • 基金资助:

    兰州空间技术物理研究所自主研发项目(YSC0714)

A diagnostic scheme for electron density in μ-PPT plasma using H Stark broadening

WANG  Shang-Min1, ZHANG  Jia-Liang2,*, ZHANG  Tian-Ping1,  FENG  Jie1, ,ZHENG  Mao-Fan1,  HUANG  Yong-Jie1   

  1. 1Lanzhou institute of Physics, Lanzhou 730000,China
    2Dalian University of Technology, Dalian 116024,China
  • Received:2015-11-12 Revised:2015-12-10 Online:2016-02-25 Published:2016-02-24

摘要: 为了能够表征推进剂烧蚀产物的有效加速度及推进剂利用率,需要更准确地测量等离子电推力器(PPT)内等离子体的基础状态参数(电子密度、电子温度),提出了基于光谱线Stark加宽分析,提高PPT放电通道内等离子体电子密度诊断精度的一种方法。针对来自于推进剂的C原子谱线,测量线型函数和半高全宽(FWHM),可以计算电子密度,但要求等离子体电子密度需足够高。当电子密度低于1016 cm-3,此方案的测量可靠性便显著降低。为此,提出了通过向放电空间引入微量含氢气体作为示踪剂,测量H原子谱线线型和半高全宽进而诊断电子密度的技术方案。相比于C原子谱线诊断方案,氢方案可以大幅度提高电子密度测量下限至1013 cm-3,因此能够显著改进电子密度测量准确性和可靠性。

关键词: 电子密度, Stark展宽, H原子谱线分析, 等离子体电推力器, 高精度测量

Abstract: A method of electron density measurement    inside discharge channel of pulsed-plasma thruster (PPT) with higher accuracy was proposed,    based on Stark broadening spectrum analysis. By measuring the line profile and the full-width at half-maximum (FWHM) of C atom spectrum emitted by PPT plasma,the electron density can be calculated. But this requires adequate high electron density. If the electron density is lower than 1016 cm-3, the accuracy of diagnosis is dramatically decreased. Therefore, a tiny H tracer based on H atom spectrum of the line profile and the full-width at half-maximum was proposed to measure the electron density. Comparing with the conventional method, it can improve remarkably the accuracy of electron density measurement.

Key words: electron density, Stark broadening, analysis of H atom spectrum, pulsed-plasma thruster, high-precision measurement