Measurement of Non-Thermal Plasma in Atmospheric Pressure air Negative Corona Discharge

Non-thermal plasma generated by a negative corona discharge with nozzle-plate electrode was measured by optical emission spectroscopy (OES). The effects of discharge high voltage, distance between nozzle electrode and plate grounded and diameter of nozzle electrode were investigated. Non-thermal plasma was observed with OES in atmospheric pressure air. The changing of relative quantity of non-thermal of plasma produced with different experimental conditions can be shown by relative intensity of OES. It was found that non-thermal plasma would be produced more when increasing the discharge high voltage or decreasing the distance of nozzle-plate. There exists an incident value when diameter of nozzle was lower than it, production of non-thermal plasma increased with the diameter of nozzle, otherwise, production of non-thermal plasma decreased with the diameter of nozzle. In addition, OES of non-thermal plasma was mainly in ultraviolet area.