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Indexed by:期刊论文

Date of Publication:2014-02-01

Journal:PLASMA SCIENCE & TECHNOLOGY

Included Journals:SCIE、EI、Scopus

Volume:16

Issue:2

Page Number:123-127

ISSN No.:1009-0630

Key Words:surface dielectric barrier discharge; electronic excitation temperature; electric field; average electron energy; dielectric properties

Abstract:The electronic excitation temperature of a surface dielectric barrier discharge (DBD) at atmospheric pressure has been experimentally investigated by optical emission spectroscopic measurements combined with numerical simulation. Experiments have been carried out to determine the spatial distribution of electric field by using FEM software and the electronic excitation temperature in discharge by calculating ratio of two relative intensities of atomic spectral lines. In this work, we choose seven Ar atomic emission lines at 415.86 nm [(3s(2)3p(5))5p -> (3s(2)3p(5))4s] and 706.7 nm, 714.7 nm, 738.4 nm, 751.5 nm, 794.8 nm and 800.6 nm [(3s(2)3p(5))4p -> (3s(2)3p(5))4s] to estimate the excitation temperature under a Boltzmann approximation. The average electron energy is evaluated in each discharge by using line ratio of 337.1 nm (N-2(C-3 Pi(u) -> B-3 Pi(g))) to 391.4 nm (N-2(+)(B-2 Sigma(+)(u) -> X-2 Sigma(+)(g))). Furthermore, variations of the electronic excitation temperature are presented versus dielectric thickness and dielectric materials. The discharge is stable and uniform along the axial direction, and the electronic excitation temperature at the edge of the copper electrode is the largest. The corresponding average electron energy is in the range of 1.6-5.1 eV and the electric field is in 1.7-3.2 MV/m, when the distance from copper electrode varies from 0 cm to 6 cm. Moreover, the electronic excitation temperature with a higher permittivity leads to a higher dissipated electrical power.