Transitions of an atmospheric-pressure diffuse dielectric barrier discharge in helium for frequencies increasing from kHz to MHz

作者: J-S Boisvert , J Margot , F Massines

DOI: 10.1088/1361-6595/AA56A5

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摘要: Recent studies have shown that tuning a dielectric barrier discharge (DBD) in the medium-frequency range (MF: from 0.3 to 3 MHz) allows low-power and high-power mode be sustained. In present article effect of driving frequency on DBD is studied low-frequency (LF: 30 300 kHz) high-frequency (HF: MHz). This achieved using fast imaging together with electrical spectroscopic diagnostics. At every frequency, diffuse It observed at 25 kHz an atmospheric-pressure glow (APGD) while 15 MHz behaves as capacitive RF-α mode. The usual LF APGD behavior up 100 kHz. Above 200 kHz, positive column remains during whole cycle so hybrid 5 MHz, finally turns into addition APGD, modes obtained when applied voltage significantly higher than ignition value, two other can reached low voltage. A Townsend-like 50 range, Ω Moreover, only 1.0 2.7 there large hysteresis occurring transits back forth also found increases rms current over orders magnitudes decreases by about 60%. gas temperature estimated N2 rotational spectra always close room but more energy efficient (in HF range) lower fraction heating.

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