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.
In this paper, we process images of different patterns with a Fast Fourier Transformation (FFT) to investigate
the spatial development of patterns in dielectric barrier discharge system. A bifurcation scenario from hexagonal
pattern to square pattern is observed under circular boundary as the driving voltage increasing. The spatial
characteristics of hexagonal pattern and square pattern are studied by analyzing their related spatial Fourier spectra.
In addition, a transition from hexagons to squares and a further development of square pattern with dislocation
defect are also researched by analyzing their Fourier spectra.
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.
The non-intrusive optical emission spectroscopy is used to measure the vibrational temperature and the electron density
in white-eye pattern in dielectric barrier discharge (DBD) in air. The electron density is investigated by stark broadening
of spectral line profile, and the molecule vibrational temperature is calculated by analyzing the intensity ratio of lines in
the second positive system (SPS) of N2 (C3 ∏u
−B3∏g). The results show that the vibrational temperature and electron
density of the spot in white-eye pattern is slightly different from that of the background in white-eye pattern. It indicates
that both the spot discharge and the background discharge are microdischarges.
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