Atmospheric Dielectric-Barrier Discharges Scalable From 1 mm to 1 m

Abstract

Three types of atmospheric dielectric-barrier discharges are presented to illustrate their potential for uniform surface treatment with a length scale spanning from 1 mm to 1 m. As these atmospheric discharges are scaled up in size, it is increasingly difficult to sustain their plasma stability. By using nanosecond images, it is shown that the use of high excitation frequencies is beneficial in achieving excellent uniformity and robust plasma stability, which are both desirable for uniform and reproducible surface treatment.Index Terms-Atmospheric pressure glow discharges, pulsed plasmas, radio-frequency discharges.

Three distinct modes in a cold atmospheric pressure plasma jet

“…at least up to the moment the photograph was taken. This is consistent with figure 7 and with our previously reported observation [42]. .…”

“…This phenomenon continues until arcing. Previous studies of a similar plasma jet excited from 10kHz to 1MHz showed a similar trend with increasing frequency [42]. As the frequency was increased, each discharge event became temporally closer resulting in a continuous presence of excited species in the electrode gap to support continuous electron production [42].…”

Uniform and non-uniform modes of nanosecond-pulsed dielectric barrier discharge in atmospheric air: fast imaging and spectroscopic measurements of electric fields

“…Unfortunately, at atmospheric pressure, a uniform DBD can be easily transformed into a filamentary dielectric DBD; therefore some serious issues arise, such as gas heating due to strong discharges in the random microdischarge channel and non-uniform energy distribution, which adversely affect applications. These issues traditionally are solved by use of an appropriate working gas composition, an alternating current driving frequency, lowering of gas pressure, etc [10–12]. The transitions between discharge modes in the same experimental conditions have been thoroughly investigated in nitrogen, rare gases and their mixtures with air and other gases [2, 8, 13, 15].…”

Characterization of Dielectric Barrier Discharge (DBD) on Mouse and Histological Evaluation of the Plasma‐Treated Tissue

“…In particular, the medical uses of non‐thermal atmospheric‐pressure plasma devices are profoundly investigated. These plasma devices are distinct in terms of their configuration, the applied electrical parameters and working gases used 1–6. Accordingly, they offer an ‘indirect’ or a ‘direct’7 plasma which is useful for medical treatment of living tissues.…”