Study On The Dynamics Of Luminous Patterns In Dielectric Barrier Discharge In Multiple Gasses

In this work, stable patterned discharges in air are realized for the first time by using two water electrodes with a confined boundary condition. The spatiotemporal dynamics of patterned discharges is studied experimentally by an optical method. Concentric ring pattern is investigated numerically with a Reaction-Diffusion equation, and the numerical results are compared with that in experiment. The interaction between filaments in localized state is analysed in detail.In air discharges, several patterns, such as hexagon, square and the coexistence of them are obtained for the first time. The spatiotemporal correlation of patterned discharges is studied experimentally, and analyzed with Fourier spectrum and spatial correlation function of patterns. It has been shown that the spatiotemporal correlation between filaments increases with the applied voltage. The temporal and spatial characteristics of filaments are measured, and the obtained data are helpful to the application of patterned discharge. In addition, the dynamics of dielectric barrier discharge system is compared with that of Coulomb system.The composition of patterns in air discharge is verified experimentally for the first time. The spatiotemporal dynamics of discharge patterns is measured with high resolution (temporal resolution-10 ns, spatial resolution-20μm) by using optical and spectral methods. Results show that microdischarge is the minimum unit in patterned discharge. If the microdischarge appears at a fixed place, it would appear as a filamentary discharge. If it meanders continuously or discharge randomly in the active area, uniform appearance will be observed. In addition, the resonance mechanism of white-eye pattern is studied from the point of view of pattern dynamics.Stable spiral and target (concentric ring) patterns are observed for the first time, and studied experimentally from the viewpoint of macro-and micro-level respectively. It can be seen that the concentric ring pattern has the characteristics of bistalbe system. Furthermore, the concentric ring pattern is simulated with a Fitzhugh-Nagumo Reaction-Diffusion equation of bistable type. Its evolution results accord with that observed in experiment.Several types of localized states are studied experimentally in detail. The discharge models of the localized states are given based on the experimental results. It is shown that there exist repulsive Coulomb force and attractive Lorentz force among filaments. The travelling of filaments pair originates from alternative interaction of repulsive and attractive force between filaments. The dynamical characteristics of localized state are explained reasonably by analyzing the interaction between filaments.