Research on arc non-thermal equilibrium characteristics using chromaticity information from a visible digital image

In this study, a method was developed for diagnosing the non-thermal equilibrium physical properties of a free burning arc in air using the chromaticity information from a visible image. After extracting RGB values from the image and using digital image processing, the following two comparisons are made: (1) the red-component rate of arc for different electrode materials; (2) the chromaticity distribution at different stages of the AC arc; Analyses are also conducted based on the space radiation characteristics of the arc, differences due to the electrode material. Experiments showed that the proposed method can distinguish experimental materials and arc stages. Furthermore, since the image method is used, the method does not need to assume that the arc is in the thermal equilibrium stage.