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本工作设计了一种特殊的完全条纹水电极介质阻挡放电装置,通过求解拉普拉斯方程发现其产生了条纹状非均匀电场.采用该装置,在空气和氩气的混合气体放电中,观测到了多种具有D2h对称性的条纹斑图,其中四种条纹超点阵斑图为首次获得.选取其中结构最复杂的大小点蜂窝条纹超点阵斑图进行研究,该斑图由小点、大点和蜂窝框架三套放电丝子结构嵌套构成.实验中,利用光谱仪测量了不同子结构的发射光谱,发现其处于不同的等离子体状态;采用高速照相机和光电倍增管对其时空动力学进行测量,发现放电顺序为小点→大点→蜂窝框架,其中蜂窝框架由随机放电丝叠加而成.理论上,通过求解泊松方程模拟了不同时刻的电场分布,很好地解释了上述斑图的形成机制.In this work, a special striped water electrodes dielectric barrier discharge device is designed. Through numerical solutions to the Laplace equation, the spatial distribution of the applied electric field is revealed to exhibit a strip-shaped nonuniform distribution, characterized by alternating regions of enhanced and weakened field intensity. These field gradients play a pivotal role in governing the plasma, as the intensified regions act as preferential sites for discharge onset, directly shaping the formation and evolution of plasma structures. Using this device, a series of novel striped patterns are observed in the discharge of a mixed gas of air and argon, marking a significant advancement in pattern formation studies. Notably, four striped superlattice patterns are obtained for the first time, each displaying intricate structural hierarchies. Among these, the large and small dots honeycomb striped superlattice pattern characterized by structural complexity is selected to investigate the formation mechanisms. The pattern is composed of three substructures: small dots, large dots, and a honeycomb framework. In the experiment, the emission spectra of different substructures are measured using a spectrograph, revealing that they are in different plasma states. The spatiotemporal dynamics of the pattern is measured using a high-speed camera and two photomultiplier tubes. It is found that the discharge sequence is small dots→large dots→ honeycomb framework, where the honeycomb framework is formed by the superposition of random discharge filaments. Theoretically, the electric field distributions at different times are simulated by solving the Poisson equation, which well explains the formation mechanism of the abovementioned pattern.
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Keywords:
- Dielectric barrier discharge /
- Pattern /
- Plasma
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