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Autocorrelation function is employed to process the light emission signals obtained by PMT, which present the microdischarges igniting in dielectric barrier discharge system. In experiments, signals of different sizes area are measured. With increasing measured size, the signals changes and the number of microdischarges increase. However, the primary signals are coarse and disorder in time series,...
Images of patterns are processed with some image processing technology, such as spatial intensity distribution, spatial correlation function and Fourier transformation, thus some important intrinsic elements of active plasma and pattern formation can be presented more clearly. Images of disordered grids, spiral pattern and big spot hexagonal pattern are obtained in dielectric barrier discharge system...
The image analysis technology including Fast Fourier transform and spatial correlation functions are employed to investigate the spatial distribution of some hexagonal patterns obtained in dielectric barrier discharge system. Through Fast Fourier Transform, it is found that the wave vector increases with driving voltage increasing. Through spatial correlation functions calculation to the patterns,...
Spatial correlation function and fast Fourier transform (FFT) are important methods in analysis of pattern. In this paper, images of square, hexagonal and random filaments state are obtained in dielectric barrier discharge system with decreasing applied voltage. The average distance between neighboring filaments is analyzed by spatial correlation. It increases with the decreasing of the applied voltage...
Fast Fourier Transform is a kind of methods of image processing, which is used in this paper to analyze evolution of patterns observed in dielectric barrier discharge in air/argon. It is found that a new type of pattern named asymmetric hexagon pattern is a kind of superlattice pattern by analyzing the spatial Fourier spectrum. The evolution of the pattern with voltage increasing is not exactly the...
Discharge current has been measured to diagnose the discharge modes of dielectric barrier discharge in a coaxial geometry through a mixture flows of argon and trace of air at one atmospheric pressure. Experimental results show that there are two discharge modes in the dielectric barrier discharge, corona discharge mode and glow discharge mode. The corona discharge only occurs in the tip of needle...
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