%0 Journal Article
%T Characterization of DC argon plasma jet at atmospheric pressure<br>大气压直流氩等离子体射流工作特性研究
%A Cheron Bruno
%A Yan Jian-Hua
%A Tu Xin
%A Ma Zeng-Yi
%A Pan Xin-Chao
%A Cen Ke-Fa
%A Cheron Bruno
%A <br>严建华
%A 屠昕
%A 马增益
%A 潘新潮
%A 岑可法
%J 物理学报
%D 2006
%I 
%X An original DC double anode plasma torch operating with argon at atmospheric pressure which provides a long time and highly stable plasma jet is analyzed through its electrical and optical signals. Effects of gas flow rate and current intensity on the arc dynamics behaviour are studied using standard diagnostic tools such as FFT and correlation function. An increasing current-voltage characteristic is reported for different argon flow rates. It is noted that the takeover mode is characteristic for argon plasma jet and arc fluctuations in our case are mainly induced by the undulation of torch power supply. Furthermore, the excitation temperatures and electron densities of the plasma jet inside and outside the arc chamber have been determined by means of optical emission spectroscopy (OES).The criteria for the existence of local thermodynamic equilibrium (LTE) in plasma is then discussed. The results show that argon plasma jet at atmospheric pressure under our experimental conditions is close to LTE.
%K plasma torch
%K jet fluctuation
%K excitation temperature
%K local thermodynamic equilibrium<br>等离子喷枪
%K 射流脉动
%K 激发温度
%K 局域热力学平衡
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=1B2ABC4D1B01AD5C&yid=37904DC365DD7266&vid=E514EE58E0E50ECF&iid=DF92D298D3FF1E6E&sid=38B239F39FA14AB3&eid=9292CA3ABBD95F8C&journal_id=1000-3290&journal_name=物理学报&referenced_num=6&reference_num=20