大气压等离子体炬电子密度的光谱诊断  

Spectral diagnostics of electron density of plasma torch at atmospheric pressure

作　　者：董丽芳[1] 刘为远[1] 杨玉杰[1] 王帅[1] 嵇亚飞[1] 

机构地区：[1]河北大学物理科学与技术学院,保定071002

出　　处：《物理学报》2011年第4期365-370,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10975043;10775037);河北省自然科学基金(批准号:A2010000185)资助的课题~~

摘　　要：利用空心针-板放电装置产生了大气压等离子体炬,采用光谱法测量了其内部及表面的电子密度.向空心针中通入氩气,在大气环境中产生了长度为1cm的等离子体炬.实验分别测量了Hα谱线和ArⅠ(696.54nm)谱线,通过反卷积方法分离出其相应的Stark展宽,并由此计算了电子密度.结果发现,采用Hα谱线和ArⅠ(696.54nm)谱线Stark展宽计算得到的等离子体的电子密度分别为1.0×1015cm-3和3.78×1015cm-3.考虑到Hα谱线源于等离子体炬表层与周围大气接触时产生的大气中水分子的离解激发,Hα线Stark展宽计算得到的电子密度应为等离子体表层处的电子密度,而根据ArⅠ(696.54nm)谱线的Stark展宽得到的电子密度是等离子体内部的电子密度.An atmospheric pressure plasma torch is generated with a hollowneedle-to-plate dielectric barrier discharge and the electron densities in the inside and at the surface of the plasma torch are measured by optical emission spectroscopy（OES）.A plasma torch with 1cm long is generated in atmospheric ambient when argon gas is introduced through the hollwneedle.The Stark broadenings of Hα and ArⅠ（696.54 nm） lines,which are decomposed from the experimental profiles by using deconvolution method,are used to estimate the corresponding electron densities.The electron densities are 1.0 × 1015 cm-3 and 3.78 × 1015 cm-3 corresponding to the Stark broadening of Hα and ArⅠ（696.54 nm） lines,respectively.The electron density calculated from the Stark broadening of Hα is the same as that at the surface of the plasma because Hα line originates from the dissociation and the excitation of H2O at the plasma torch surface where argon can meet with atmosphere.While the electron density calculated from the Stark broadening of ArⅠ（696.54 nm） line is the same as that in the insid of plasma.

关 键 词：等离子体炬 电子密度 气体温度 Stark展宽 

分 类 号：O536[理学—等离子体物理]