Combined Image Processing and Equivalent Circuit Approach for the Diagnostic of Atmospheric Pressure DBD

Abstract

The framework of this paper is the study of gas treatments (NOx abatement) by dielectric barrier discharge (DBD) at atmospheric pressure. To investigate the impact of various solutions for electrical energy injection on the treatment process, two diagnostic methods are considered to evaluate the discharging ratio on the reactor surface: an image processing method and a DBD equivalent circuit analysis, both presented in this paper. For the image analysis, the discharge area is first translated into gray levels, then segmented using the Otsu’s method in order to perform the discharging ratio diagnostic. The equivalent circuit approach, derived from the classical Manley’s diagram analysis, includes the behavior of the part of the reactor in which no discharge is happening. The identification of its parameters is used to estimate the discharging ratio, which evaluates the percentage of the reactor surface covered by the discharge. Experimental results with specifically developed power supplies are presented: they show a good agreement between the two methods. To allow a quantitative comparison of the discharge uniformity according to the operating conditions, the statistical analysis of gray level distribution is performed: non-uniform discharges with intense energy channels are shown to be clearly distinguished from more diffuse ones.

Generation of meter-scale nanosecond pulsed DBD and the intelligent evaluation based on multi-dimensional feature parameter extraction

“…Images of nanosecond discharge in m-DBD under different positions are converted into grayscale images with the size of M × Q, constructing a 2D matrix with the position coordinates of each pixel point as (x, y) and the gray value as g(x, y). The standard deviation of the gray value (GVSD) of the nanosecond discharge can be calculated according to equation (1) [28][29][30][31]:…”

The Promising Potential of Cold Atmospheric Plasma Therapies

“…However diffused or homogenous plasma is far more possible to obtain using this method than filamentary plasma [53]. Many research groups over the years have successfully generated diffused, homogeneous plasmas when using atmospheric pressure [28][29][30]51,53]. Instead of a streamer breakdown, a Townsend breakdown is started to create a glow DBD.…”

Recent Advances in Atmospheric-Pressure Plasma Technology

“…Contributions to this Special Issue focus on different aspects of Atmospheric-Pressure Plasma Technology, giving valuable examples of applied research in the field. This Special Issue of Applied Sciences, "Recent Advances in Atmospheric-Pressure Plasma Technology", includes one review [3] and eight original papers [4][5][6][7][8][9][10][11], providing new insights into the application of atmospheric pressure plasma technology. Domonkos et al [3] discussed the application of cold atmospheric pressure plasma (CAPP) technology in different configurations.…”

“…Rueda et al [11] report a study which is focused on gas treatments (NOx abatement) by dielectric barrier discharge (DBD) at atmospheric pressure. Two diagnostic methods are considered to evaluate the discharging ratio on the reactor surface: an image processing method and a DBD equivalent circuit analysis, both presented in this paper.…”