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It is very useful and necessary to apply monitoring technology in electrical power system especially the transmission lines. The monitoring method of transmission line based on video technique, which is introduced in this paper, can calculate the thickness of the ice covering on the transmission line, recognize the galloping line, and give an alarm if necessary. The method principle and the technical...
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...
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