A particle-pair of filaments is obtained by using liquid electrodes in a dielectric barrier discharge system. It travels in the
direction of the larger filaments and rebound at the boundary of discharge area. By using image processing and image
analyzing of the recorded pictures and video, the traveling velocity of particle-pair is calculated to be about 1.2 cm/s.
Moreover, the interparticle distance of particle-pair changes periodically with a period about 0.5 s.
The non-intrusive optical emission spectroscopy of the N2 second positive band system (C3Πu→B3Πg) are used to
measure the vibrational temperature in N2/Ar and air/Ar discharges at atmospheric pressure, respectively. In N2/Ar
discharges, the strip patterns can be obtained at the concentration of N2 from 9.5% to 38% at 10kV and 60kHz, and its
vibrational temperature increases approximately from 1600K to 1750K with increasing the N2 concentration. Increasing
the concentration of N2 from 38% to 96%, the hexagon patterns are formed and its vibrational temperature increases
from 1750K to 1950K. In air/Ar discharges, three patterns (strips, quasisuperlattice and hexagon) are obtained with air
concentration increasing from 9.5% to 96% at 10kV and 60kHz. The vibrational temperature ranges approximately from
1850K to 2750K, which is about 250~600K higher than that in N2/Ar discharges under the same concentration of N2 and
air in two-gas-species. In addition, the quasisuperlattice can be observed at the air concentration from 19% to38%, and
its vibrational temperature is from 2000K to 2300K approximately. It indicates that the gas species and the mixing ratios
affect the patterns and their vibrational temperatures. Furthermore, it is also found that the breakdown voltage and the
moment of discharge initiation are different as a function of the gas species and the mixing ratios.
A dielectric barrier discharge apparatus with two liquid electrodes and a photoelectric detection system are specially
designed to study the photo-electrical characteristic of different patterns. A series of filamentary patterns, in which the
filaments can be fixed for a long time, have been generated from filaments moving stochastically by increasing applied
voltage. It follows the sequence of square pattern, square superlattice pattern and hexagon pattern. The studies of optical
and electrical characteristics, including discharge current, light signals, the voltage drop across discharge gap, transported
charges, and Lissajous figures of these different patterns are realized by the photo-electrical detection method. From the
light signals and waveforms of current, it is found that the square pattern has two discharge pulses, the square
superlattice has three and the hexagon has several pulses in each half cycle of the applied voltage. The voltage drop
across discharge gap and transported charges increase with the increasing of applied voltage. The dissipated power
obtained by the charge-voltage Lissajous figures also increases with the increasing of applied voltage.
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