中文摘要：

在空气与氩气组成的混合气体的介质阻挡放电实验中,采用发射光谱法,首次研究了放电气隙分别为：1,4和2mm三层放电气隙中的放电丝的光谱特性。这与以往的单层放电气隙或者是双层放电气隙中的放电丝在光谱特性方面有很大的不同。实验通过采集氮分子第二正带系（C-3Πu→B-3Πg）谱线,计算出不同放电气隙中的放电丝的分子振动温度。利用氮分子离子391.4nm谱线强度与氮分子394.1nm谱线的强度之比得到不同放电气隙中放电丝的电子平均能量。增加氩气在混合气体中的比例,得到分子振动温度及电子平均能量随着氩气含量增加的变化趋势。实验结果表明：在同一氩气含量下,分子振动温度从小到大的顺序为：2mm放电气隙,1mm放电气隙,4mm放电气隙。电子平均能量从小到大的顺序为：4mm放电气隙,2mm放电气隙,1mm放电气隙。三层放电气隙中放电丝的分子振动温度及电子平均能量均随着氩气含量的增加而减小。

英文摘要：

By optical emission spectrum,we report on the first investigation on the spectral characteristics of filaments in three layers gas gap in dielectric barrier discharge,which filled with gas-mixture of argon and air.The filaments are generated in 1mm gas gap,4mm gas gap and 2mm gas gap,respectively.With previous single layers gas gap or double layers gas gap of the filaments are very different in terms of spectral characteristics.The emission spectra of the N2 second positive band（C-3Πu→B-3Πg）are measured,from which the molecule vibrational temperature of the filaments which generated in different gas gap are calculated.Based on the relative intensity of the line at 391.4nm and the N2 line at 394.1nm,the electron average energy of the filaments which generated in different gas gap are investigated.Increasing the content of argon,the change of the molecule vibrational temperature and the electron average energy of the filaments are investigated.It is found the ascending order of the molecule vibrational temperature in the same argon content is：2mm gas gap,1mm gas gap and 4mm gas gap.However the ascending order of the electron average energy in the same argon content is：4mm gas gap,2mm gas gap and 1mm gas gap.The molecule vibrational temperature and the electron average energy of the filaments decrease with the argon content increasing.