Abstract
In this paper, an atmospheric pressure polyethylene terephthalate dielectric barrier discharge is produced in a helium–argon mixture. The influences of the electrode voltage on the discharge mode are experimentally investigated. The results show that, at a fixed argon content of 50%, the discharge transits from local uniform, through the isolated pattern, to whole uniform with the increase in the electrode voltage. Both the peak value of current pulse and argon spectra (696.54, 763.13, 772.09, 811.17, and 911.81 nm) intensities are captured to clarify the characteristics of the discharge mode transition. The different discharge characteristic regions are obtained by varying the argon content. In addition, the influence of the argon content on the above-mentioned argon spectra intensities is also researched. The spectra intensities enhance at 696.54, 763.13, and 772.09 nm but weaken at 811.17 and 911.81 nm with the increase in the argon content when the discharge operates in the whole uniform mode. The physical reasons for these results are discussed.
Highlights
In recent decades, atmospheric pressure dielectric barrier discharges (DBDs) have many important applications in surface modification, industrial ozone generation, excitation of CO lasers, etc.,1–3 due to their high-density, high-energy reactive species
The results show that, at a fixed argon content of 50%, the discharge transits from local uniform, through the isolated pattern, to whole uniform with the increase in the electrode voltage
The atmospheric pressure DBD, excited by kilohertz high-voltage power supply, usually operates in filamentary, self-organized pattern, or uniform glow discharge mode, which depends on the gas composition, electrode voltage, dielectric material, etc
Summary
Atmospheric pressure dielectric barrier discharges (DBDs) have many important applications in surface modification, industrial ozone generation, excitation of CO lasers, etc., due to their high-density, high-energy reactive species. The production of active species is closely related to the discharge mode. The atmospheric pressure DBD, excited by kilohertz (kHz) high-voltage power supply (denoted kHz DBD hereafter), usually operates in filamentary, self-organized pattern, or uniform glow discharge mode, which depends on the gas composition, electrode voltage, dielectric material, etc.. Typical materials used for the dielectric are normally glass, quartz, ceramic, etc., but the polyethylene terephthalate (PET) discharge characteristic is rarely discussed in great detail. Guikema et al. discovered three types of periodic patterns in a one-dimensional discharge configuration. A He/Ar DBD operated in the stratified glow mode is demonstrated by the Ar/He/Ar layered gas configuration.
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