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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...
The Fast Fourier Transform is an important method in analysis patterns. In this paper, the FFT is used to the images of the patterns to analyze the competition of the modes and the evolution of the patterns. With the increase of applied voltage the competition between patterns are obtained in dielectric barrier discharge system with two liquid electrodes at the pressure p = 0.3 atm and p = 0.2 atm...
Several spatiotemporal patterns: random spots, hexagon pattern, coexistences of hexagon and square pattern, and square pattern are obtained in dielectric barrier discharge system while increasing the voltage with other parameters fixed. By using image processing including spatial correlation function and Fourier spectrum, the structures of patterns and the bifurcation scenario are studied. It is shown...
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