介质阻挡放电中点线超四边形发光斑图研究

Abstract

The spatio-temporal structures and plasma parameters of the dot-line square superlattice luminous pattern are investigated by using photomultiplier and spectrograph. Optical signals from the discharge filaments show that the dot-line square superlattice pattern is an interleaving of four different transient sub-lattices,three of them occur at the rising edge and one of them at the falling edge in each half voltage-cycle. And the discharge sequence is followed as the small-dot square sub-lattice,the big-dot line sub-lattice,big-dot halo sublattice and the small-dot square sub-lattice located in the center of each big-dot. The emission spectra of the N2 second positive band( C3Πu→B3Πg)are collected and used to calculate the molecular vibration temperatures of the four transient sub-lattices in this pattern. Measurements show that different sub-lattices almost have the same molecular vibration temperature. The influence of the wall charge distribution on the formation process and the spatio-temporal dynamics of the dot-line square superlattice pattern are discussed. It is found that wall charges deposited on the dielectric surface have a great influence on discharge process.