Spatiotemporal characteristics of nanosecond pulsed discharge in an extremely asymmetric electric field at atmospheric pressure  

作　　者：Li ZHANG Dezheng YANG Sen WANG Wenchun WANG 张丽;杨德正;王森;王文春(Key Lab of Materials Modification (Dalian University of Technology), Ministry of Education, Dalian 116024, People's Republic of China)

机构地区：[1]Key Lab of Materials Modification (Dalian University of Technology), Ministry of Education, Dalian 116024, People's Republic of China

出　　处：《Plasma Science and Technology》2017年第6期38-44,共7页等离子体科学和技术（英文版）

基　　金：supported by the Key Project of Chinese National Programs for Research and Development(No. 2016YFC0207200);National Natural Science Foundation of China(Nos.51677019,51407022,51377014)

摘　　要：In this paper,high resolution temporal-spatial diagnostics are employed to research the optical characteristics of nanosecond pulsed dielectric barrier discharge in needle-plate electrode configuration.Temporal-spatial distributions of discharge images,the emission intensities of optical emission spectra,and plasma vibrational and rotational temperatures are investigated.By analyzing the evolution of vibrational and rotational temperatures in space and time dimensions,the energy distribution and energy transfer process in plasma are also discussed.It is found that a diffuse structure with high density plasma concentrated in the region near the needle tip can be presented in nanosecond pulsed discharge,and an obvious energy transfer from electronic energy to vibration energy can be observed in each discharge pulse.In this paper,high resolution temporal-spatial diagnostics are employed to research the optical characteristics of nanosecond pulsed dielectric barrier discharge in needle-plate electrode configuration.Temporal-spatial distributions of discharge images,the emission intensities of optical emission spectra,and plasma vibrational and rotational temperatures are investigated.By analyzing the evolution of vibrational and rotational temperatures in space and time dimensions,the energy distribution and energy transfer process in plasma are also discussed.It is found that a diffuse structure with high density plasma concentrated in the region near the needle tip can be presented in nanosecond pulsed discharge,and an obvious energy transfer from electronic energy to vibration energy can be observed in each discharge pulse.

关 键 词：nanosecond pulsed discharge spatiotemporal emission spectrum reduced electric field breakdown mechanism 

分 类 号：O461.25[理学—电子物理学]