大气压电子束等离子体密度诊断实验  

Microwave diagnose on electron density of electron-beam-generated air plasma

作　　者：刘世贵 方吉汉 范威 谭畅 邓永锋 韩先伟 LIU Shigui;FANG Jihan;FAN Wei;TAN Chang;DENG Yongfeng;HAN Xianwei(Shaanxi Key Laboratory of Plasma Physics and Applied Technology,Xi’an Aerospace Propulsion Institute,Xi’an Shaanxi 710100,China)

机构地区：[1]西安航天动力研究所,陕西省等离子体物理与应用技术重点实验室,陕西西安710100

出　　处：《太赫兹科学与电子信息学报》2020年第4期639-642,共4页Journal of Terahertz Science and Electronic Information Technology

基　　金：国家自然科学基金资助项目(11475131)。

摘　　要：大气压电子束等离子体密度诊断用微波法和光谱法较为合适,根据微波在等离子体中的传播特性,利用微波透过等离子体时透射能量衰减和相位变化,计算等离子体密度,并与光谱诊断结果进行比较,2种方法诊断结果基本一致。在微波诊断等离子体实验研究中,发现空气湿度对大气压等离子体密度有显著影响,利用大气化学模型仿真研究湿度对等离子体密度影响规律,获得与实验测试一致的结果。Microwave and optical measurements are the best diagnostic methods for electron-beamgenerated air plasma. According to the microwave characteristic of plasma, the attenuation in energy and phase shift can be adopted to diagnose electron density. The experimental results of microwave and optical measurements are coincident. From the experiment results, humidity effect on air plasma is analyzed, and it is found that the electron density of humid air plasma is obviously reduced compared to that of the dry air plasma under the same experiment conditions. The numerical calculations using the chemical processes model are completed for air plasma, and the numerical result is in a good agreement with the experimental result.

关 键 词：大气压等离子体 微波诊断 衰减 密度 碰撞频率 湿度 

分 类 号：TN011[电子电信—物理电子学]