Dong Li-Fang, Zhu Ping, Yang Jing, Zhang Yu
Guang Pu Xue Yu Guang Pu Fen Xi. 2014 Apr;34(4):915-8.
The authors report on the first investigation of the variations in the plasma parameters in the formation process of the honeycomb pattern in a dielectric barrier discharge by optical emission spectrum in argon and air mixture. The discharge undergoes hexagonal lattice, concentric spot-ring pattern and honeycomb pattern with the applied voltage increasing. The molecular vibration temperature, electron excitation temperature and electronic density of the three kinds of patterns were investigated by the emission spectra of nitrogen band of second positive system (C3pi(u) --> B3 pi(g)), the relative intensity ratio method of spectral lines of Ar I 763.51 nm (2P(6) --> 1S(5)) and Ar I 772.42 nm (2P(2) -->1S(3)) and the broadening of spectral line 696.5 nm respectively. It was found that the molecular vibration temperature and electron excitation temperature of the honeycomb pattern are higher than those of the hexagonal lattice, but the electron density of the former is lower than that of the latter. The discharge powers of the patterns were also measured with the capacitance method. The discharge power of the honeycomb pattern is much higher than that of the hexagonal lattice. These results are of great importance to the formation mechanism of the patterns in dielectric barrier discharge.
作者报道了首次通过氩气与空气混合气体中的光学发射光谱，对介质阻挡放电中蜂窝状图案形成过程中的等离子体参数变化进行的研究。随着施加电压的增加，放电经历六角晶格、同心光斑 - 环形图案和蜂窝状图案。利用第二正系统氮带（C3π(u)→B3π(g)）的发射光谱、Ar I 763.51 nm（2P(6)→1S(5)）和Ar I 772.42 nm（2P(2)→1S(3)）谱线的相对强度比法以及谱线696.5 nm的展宽，分别研究了这三种图案的分子振动温度、电子激发温度和电子密度。结果发现，蜂窝状图案的分子振动温度和电子激发温度高于六角晶格，但前者的电子密度低于后者。还采用电容法测量了这些图案的放电功率。蜂窝状图案的放电功率远高于六角晶格。这些结果对于介质阻挡放电中图案的形成机制具有重要意义。
