Monopole Antenna Probe for Density Measurements in Cold Plasmas

A simple diagnostic tool for density measurements in plasma with a certain spatial resolution is proposed in this paper. It uses the emission characteristics of monopole antenna to determine the dielectic property of plasma c = 1 - fp^2/f^2, with the fp electron plasma frequency related to plasma de...

Full description

Saved in:
Bibliographic Details
Published in:Plasma science & technology 2011-04, Vol.13 (2), p.197-200
Main Author: 王慧慧 李弘 王雨后 李斌 尤玮 陈志鹏 谢锦林 刘万东
Format: Article
Language:English
Subjects:
Langmuir
冷等离子体
单极天线
密度测量
探头
等离子体密度
等离子体电位
等离子体频率
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A simple diagnostic tool for density measurements in plasma with a certain spatial resolution is proposed in this paper. It uses the emission characteristics of monopole antenna to determine the dielectic property of plasma c = 1 - fp^2/f^2, with the fp electron plasma frequency related to plasma density. We immersed a inonopole antenna probe into plasma and introduced a microwave signal via a network analyzer. When the emitted power is maximized, the reflected power is minimized and there occurs a resonance. Since can be derived from the resonant frequency, this is actually a method to measure the absolute electron density. Validated by a comparison with the amended Langmuir double-probe method, the monopole antenna probe is valuable. In addition, it is free from the difficulties, such as fluctuation in plasma potential.
ISSN:1009-0630
DOI:10.1088/1009-0630/13/2/14