Pulsed Atmospheric-Pressure DBD Plasma Produced in Small-Diameter Tubes

This paper presents the experimental results on the characterization of plasma produced in narrow tubes using a pulsed dielectric barrier discharge (DBD), working in helium or helium-oxygen gas mixture at atmospheric pressure, in a symmetrical configuration of external electrodes. This paper focuses...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2015-02, Vol.43 (2), p.572-579
Main Authors: Buda, Ioana Gianina, Irimiea, Cornelia, Agheorghiesei, Catalin, Chiper, Alina Silvia
Format: Article
Language:English
Subjects:
Absorption
Atmospheric pressure
Atmospheric-pressure plasma
dielectric barrier discharge (DBD)
Dielectrics
Discharge
Discharges (electric)
Electrodes
Electron tubes
Helium
Plasma physics
Plasmas
pulsed glow discharge
spectral plasma diagnosis
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Summary:This paper presents the experimental results on the characterization of plasma produced in narrow tubes using a pulsed dielectric barrier discharge (DBD), working in helium or helium-oxygen gas mixture at atmospheric pressure, in a symmetrical configuration of external electrodes. This paper focuses on the effect induced by the total gas flow rate and gas composition on the characteristics of pulsed DBD. Using tunable diode laser absorption spectroscopy, ultraviolet absorption, and optical emission spectroscopy, complementary information on the reactive species (O, O 3 , N 2 , and N 2 + ) present in the discharge has been obtained. It results that the excited species generated by direct electron excitation (as He and N 2 ) follow the evolution of their precursors with increasing gas flow rate, while those created by chain reactions (as N 2 + , O, and O 3 ) depend on the collective behavior of all their precursors, regardless of the fact that these are originating from the feeding gas or are coming from impurities. At specific energies, between 5 and 50 J/L, and a gas temperature of 315 ± 20 K, the atmospheric-pressure plasma is able to produce 10 14 -10 15 m -3 of O (3 5 S 2 ) or (1.5-2.8) × 10 15 cm -3 of O 3 , depending on the feeding gas composition and its flow rate. Low gas temperature and high density of reactive species could make the present DBD arrangement suitable for medical applications.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2015.2388494