Research on Discharge Characteristics of Floating-Electrode DBD

As a method of generating low-temperature plasma, dielectric barrier discharge (DBD) has been applied in many occasions. Traditional DBD has limited application space due to the size of electrode gaps. In this article, a floating-electrode DBD (FE-DBD) structure is designed. The differences in discharge characteristics, spectral characteristics, and water solution treatment effects between FE-DBD and traditional dual electrode DBD are compared. The results show that discharge occurs at both the rising and falling edges of square wave pulses in both structures. However, the discharge current and power under FE-DBD are significantly smaller than DBD. Meanwhile, the ungrounded metal electrode of FE-DB can be equivalent to a large resistor and capacitor in parallel. Based on the circuit analysis and MATLAB/Simulink simulation, the resistance and capacitance values are calculated. The emission spectral intensity of FE-DBD is weaker than that of DBD. Both the vibration temperature and rotation temperature under FE-DBD structure are slightly lower than DBD. In the treatment of sodium indigo disulfonate solution, the processing effect of FE-DBD is weaker than that of DBD under the same time. Its energy efficiency is higher than DBD.