Study on Radiation of Microgap DBD Plasma at Atmospheric Pressure

Abstract

This chapter presents a study on the radiation of microgap dielectric barrier discharges (DBD) plasma at atmospheric pressure in a device with a transparent electrode and observes it from side view. DBD radiation is used to describe the ionization state of medium gases. It can establish nonthermal equilibrium plasma at near or over atmospheric pressure range. The main advantage of this type of electrical discharge is that active species for chemic reaction can be produced at low temperature though the vacuum set-up is taken off. This has led to a number of important applications, including ozone synthesize, UV lamp-house, and CO 2 lasers. As a result, the applied voltage, applied frequency, and the configuration of DBD can affect on its radiation. Some methods—including the narrow discharge gap, thinner dielectric layer, high-frequency, and high-voltage power supply— are used in the microgap DBD at atmospheric pressure. These improvements are very helpful in increasing the electrical field strength and power density in the discharge gap of DBD. Therefore, a strong ionization discharge is realized at atmosphere pressure.