介质阻挡放电中D2h超点阵斑图的研究  

Study on the D2h superlattice pattern in dielectric barrier discharge

作　　者：韩蓉 董丽芳[1] 黄加玉 孙浩洋 HAN Rong;DONG LiFang;HUANG JiaYu;SUN HaoYang(College of Physics Science and Technology,Hebei University,Baoding 071002,China)

机构地区：[1]河北大学物理科学与技术学院

出　　处：《中国科学：物理学、力学、天文学》2019年第6期47-53,共7页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(编号:11375051);河北省教育厅项目(编号:LJRC001)资助

摘　　要：在介质阻挡放电系统中,首次观察到一个由六边形点阵和四边形点阵嵌套而成的Dm超点阵斑图.采用高速照相机(ICCD)研究了D2h超点阵斑图的时空动力学结构,分析可知:D2h超点阵斑图是由六边形子点阵、晕和四边形子点阵相互嵌套而成,且在每个外加电压半周期内子点阵的放电顺序依次为:六边形子点阵、晕、四边形子点阵.通过分析演化过程中出现的一系列斑图,发现对称性的演化顺序为:D4h-D4h和D6h的混合态-D2h-D2h,演化过程中斑图的对称性逐渐降低.通过分析子结构的对称性发现六边形子点阵、晕和四边形子点阵均属于D2h点群.利用发射光谱法采集了氮分子(N2)第二正带系(C^3Пu→B^3Пg)的发射谱线和氩原子696.57 nm (2P2→1S5)处的发射谱线,并计算得到了D2h超点阵斑图中不同子结构的分子振动温度和电子密度.结果显示3套不同子结构的分子振动温度和电子密度相近,由此表明3套不同子结构的等离子体状态基本相同.最后,用壁电荷理论对斑图的形成进行分析.We observed on a D2hsuperlattice pattern in the dielectric barrier discharge for the first time. Its spatiotemporal structure investigated by an intensified charge-coupled device shows that it is an interleaving of three different sublattices, which are hexagonal sublattice, halos and square sublattice, respectively. With increasing driving parameter, the discharge sequence is hexagonal sublattice-halos-square sublattice in each half cycle of applied voltage. The evolution sequence of the symmetry is D4h-the mixed state of both D4h and D6h-D2h-D2hby analyzing a series of patterns occurred in the evolution process. The symmetry of the hexagonal sublattice, the square sublattice and the halos belong to D2hpoint group by analyzing the symmetry of the three sublattices. The emission line of the second positive band system(C3∏u→B3∏g) of the nitrogen molecule(N2) and the emission line at 696.57 nm(2P2→1S5) of the argon atom were collected by using emission spectroscopy. The molecular vibration temperature and electron density of three different substructures in the D2hsuperlattice pattern are obtained. The results show that the molecular vibration temperature and electron density of the three different substructures are similar, which indicates that the plasma states of the three different substructures are the same. The formation of the D2hsuperlattice pattern is analyzed by the wall charges.

关 键 词：介质阻挡放电 D2h超点阵斑图 对称性 等离子体参量 

分 类 号：O461.2[理学—电子物理学]