Study On Superlattice Pattern Of Three Kinds Of Discharge Air Gap In Dielectric Barrier Discharge

In this paper,the water electrode device is used to study the gas discharge pattern in three kinds of discharge air gaps in dielectric barrier discharge.Firstly,the linear-zigzag transition is observed and studied in dielectric barrier discharge with rectangular frames for the first time.Secondly,a new D_2hh symmetric discharge air gap is designed and a pattern with D_2hh symmetry is obtained.Finally,the white-eye stripe superlattice pattern is obtained with the ordinary square discharge boundary for the first time.Using the photomultipliers and an intensified charge-coupled device study the spatiotemporal dynamics of the pattern,the high-speed video camera is used to observe the discharge pattern,and the plasma parameters of different sublattices are measured by the spectrometer.The formation mechanism of the above pattern and the experimental phenomena are all explained by the wall charges theory.This work further understands the wall charges and expands the type of pattern.The four parallel rectangles are used as discharge boundary in the dielectric barrier discharge for the first time.Under this new discharge boundary,an interesting phenomenon of linear-zigzag transition is observed.The photomultipliers and the intensified high-speed camera are used to study the spacetime structure of the unstable linear spot pattern and the zigzag superlattice pattern.The zigzag superlattice pattern is made up of dim spots at each corner,light spots between dim spots,and zigzag lines which are composed of moving spots and zigzag halos.All the spots in the linear spot pattern discharge simultaneously,and they have equal electric quantities,while the discharge sequence in the zigzag superlattice pattern is light spots,dim spots,halos,moving spots,and electric quantities of light spots are more than that of dim spots.The zigzag superlattice pattern results from unequal wall charge quantities of different sublattices and statistical self-organization of moving spots.A discharge air gap with D_2h symmetry was designed and a discharge pattern with D_2hh symmetry is obtained.The discharge gap belonged to D_2h point group is consisted of four striped structures which is made up circles and rectangles.The evolution of the pattern with this discharge gap is from D_4h to D_2hh through self-organization.The device also achieves a tunable plasma photonic crystal.The spatial-temporal structure in circular areas investigated by an intensified charge coupled device camera?ICCD?shows that it is an interleaving of three different sublattices,which are central spots,spots on the boundary,circular halos,respectively.The circular halos investigated by a high-speed video camera show that the halos are randomly filaments.The plasma parameters of different sublattices are studied by a spectrograph.The formation mechanisms of the pattern and the circular halos are analyzed by wall charges theory.A white-eye stripe superlattice pattern was obtained in dielectric barrier discharge with a common square discharge boundary for the first time.Although the discharge boundary of the device is not strip,a white-eye stripe superlattice pattern appears.The temporal correlation of the pattern was measured by photomultipliers,it can be found that the pattern consists of three sublattices,which are small spots,halos and central spots.The high-speed video camera is used to observe the discharge pattern,the plasma parameters of different sublattices of the white-eye stripe superlattice pattern are measured using a spectrometer.Finally,the wall charges theory is used to explain the formation mechanism of the white-eye stripe superlattice pattern.The experiment further studies the stripe formation and the the relationship between boundary size and strip directivity,because of the limited experimental means,the experiment needs further exploration.