Title :
On the Secondary Discharge of an Atmospheric-Pressure Pulsed DBD in He with Impurities
Author :
Chiper, Alina Silvia ; Cazan, Radu ; Popa, Gheorghe
Author_Institution :
Plasma Phys. Dept., Univ. of Iasi, Iasi
Abstract :
The secondary discharge was induced at the end of a slow-falling voltage flank, when a semisine monopolar pulse voltage excites the dielectric-barrier discharge. Formation and properties of the secondary discharge with respect to different dielectric materials such as glass, ceramic, and polyethylene theraphtalate were studied. The tunable diode laser absorption spectrometry (at 777.194 nm) was used to analyze the time-space distribution of the density of the atomic oxygen in metastable state (35S2 rarr 35P3) in addition to both discharge voltage and discharge current versus time. The secondary discharge is always formed, and its amplitude, as well as the amplitude of the main discharge, depends on surface properties of the dielectric barrier.
Keywords :
discharges (electric); helium; metastable states; plasma density; plasma diagnostics; plasma impurities; He; atmospheric-pressure pulsed discharge; atomic oxygen density; ceramics; dielectric barrier discharge; glass; impurities; metastable state; polyethylene theraphtalate; secondary discharge; semisine monopolar pulse voltage; slow-falling voltage flank; time-space density distribution; tunable diode laser absorption spectrometry; wavelength 777.194 nm; Ceramics; Dielectric materials; Diode lasers; Glass; Helium; Impurities; Laser excitation; Polyethylene; Tunable circuits and devices; Voltage; Atmospheric helium; glow mode; pulsed dielectric-barrier discharge (DBD); secondary discharge;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2008.2001425
