Study on the dark-ring white-eye square super-lattice pattern in dielectric barrier discharge

The dark-ring white-eye square super-lattice pattern was studied in dielectric barrier discharge system for the first time. Each unit cell of the pattern consisted of a central bright spot surrounded by a dark ring. The structure of dark ring around the center bright spot was similar to the white-eye, which was called the dark-ring white-eyes. The spatial-temporal dynamics of the dark-ring white-eye square super-lattice pattern was investigated by high speed frame camera (HSFC). The results showed that the dark-ring white-eye square super-lattice pattern was an interleaving of four different sub-structures. The discharge sequence was center bright dot-bright dot halo-vertex square-vertex connection in each half voltage cycle. The formation mechanism of dark-ring white-eye square super-lattice pattern and dark ring was explained by surface charges theory.