Discharge Mode Analysis of Coplanar Dielectric Barrier Discharge Based on Image Processing

Coplanar dielectric barrier discharge (CDBD) is widely used on the surface of materials because of its high plasma density and no requirement for the thickness of modified materials. In order to make the filamentary CDBD achieve suitable modification conditions under atmospheric pressure air conditions, a convenient and effective method for judging the macroscopic characteristics of discharge is urgently needed. In this article, a method of CDBD discharge analysis based on image processing is proposed, which characterizes the discharge uniformity by the saturation voltage obtained by binarization of the discharge image, the average pixel value, and the pixel variance of the discharge gray image. It makes up for the lack of identification of discharge uniformity by traditional diagnostic methods and can analyze discharge saturation voltage, discharge intensity, and uniformity efficiently and quickly. According to the above three parameters, we can further divide the discharge mode into fast discharge mode, slow discharge mode, and saturated discharge mode. The research in this article simplifies the process of determining the working conditions of surface modification using CDBD and provides a new idea for the scientific and quantitative study of the discharge characteristics of CDBD.