Photoelectric diagnoses of volume DBD by using power density modulation

Abstract

Dielectric barrier discharge (DBD) reactors excited by high voltage source working with power density modulation (PDM) have widely used in their industrial applications. For the high efficiency discharge, it is necessary to investigate the variation law of the photoelectric characteristics. In this paper, a volume diffuse DBD is established by means of parallel-plate electrodes. The methods of both the electrical parameter and optical emission spectroscopy (OES) are used to diagnose the electrical and optical parameters of the self-designed DBD cell under various discharge conditions. Meanwhile, the energy efficiency ratios (EERs) of quantum yield of active species in DBD is examined by OES. We deduce a series of formulas to calculate the consumed energy of the reactor by Lissajous figures. Using these formulas, the energy of an applied cycle and the energy consumed in a certain period of time can be obtained. The EERs of quantum yield and the conversion efficiency are not a liner trend with the change of applied voltage and energy. Only increasing the applied energy or voltage will not improve quantum efficiency, when discharge reaches a condition, the production of the active species will reached best value. The diagnostic methods used in the experiment can effectively measure the photoelectric properties of DBD.