Temporal evolution of nanosecond-pulse dielectric barrier discharges in open air
Institute of Electrical Engineering, Chinese Academy of Sciences - Beijing 100190, China
2 Key Laboratory of Power Electronics and Electric Drive, Chinese Academy of Sciences - Beijing 100190, China
3 School of Automation and Electrical Engineering, Nanjing University of Technology - Nanjing 210009, China
Accepted: 8 February 2012
Pulsed dielectric barrier discharge is a promising method for producing low-temperature plasma. In our letter, we describe atmospheric-pressure plasma driven by repetitive nanosecond pulses. The temporal emission behaviour of the discharge is investigated by fast images with 2 ns exposure time. Each image is taken during one single pulse and is not overlapped with other images taken in subsequent pulses. The discharge at a 1 mm air gap is diffuse and homogeneous, but some constricted filaments are observed in the diffuse discharge at a 4 mm air gap. Discharge starts from the center and spreads outward from the discharge electrode with mean radial velocity of about 104–106 m/s.
PACS: 52.80.-s – Electric discharges / 51.50.+v – Electrical properties (ionization, breakdown, electron and ion mobility, etc.)
© EPLA, 2012