Filamentary, patterned, and diffuse barrier discharges

Kogelschatz, U.

doi:10.1109/tps.2002.804201

Cited by 653 publications

(424 citation statements)

References 92 publications

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“…In this paper we use the RMS of the voltage and current waveforms over a time period of approximately 0.1 s using LabVIEW 8.2 software. This procedure yields an estimation of the average DC power, namely (P = IV) of the non-sinusoidal waveforms, see (1).…”

Section: Electrical Measurementsmentioning

confidence: 99%

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Electrical, Thermal and Optical Diagnostics of an Atmospheric Plasma Jet System

Nwankire

Law

Nindrayog³

et al. 2010

Plasma Chem Plasma Process

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Plasma diagnostics of atmospheric plasmas is a key tool in helping to understand processing performance issues. This paper presents an electrical, optical and thermographic imaging study of the PlasmaStream atmospheric plasma jet system. The system was found to exhibit three operating modes; one constricted/localized plasma and two extended volume plasmas. At low power and helium flows the plasma is localized at the electrodes and has the electrical properties of a corona/filamentary discharge with electrical chaotic temporal structure. With increasing discharge power and helium flow the plasma expands into the volume of the tube, becoming regular and homogeneous in appearance. Emission spectra show evidence of atomic oxygen, nitric oxide and the hydroxyl radical production. Plasma activated gas temperature deduced from the rotational temperature of nitrogen molecules was found to be of order of 400 K: whereas thermographic imaging of the quartz tube yielded surface temperatures between 319 and 347 K.

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Section: Electrical Measurementsmentioning

confidence: 99%

“…Since first reported in 1968 [1], low temperature atmospheric pressure plasmas (APP) have been deployed for many material processing applications [2,3]. One of the most widely used APP applicators is the tube design which includes: the plasma jet [4,5], plasma needle [6], plasma pencil [7], and microplasma jet [8].…”

Section: Introductionmentioning

confidence: 99%

Electrical, Thermal and Optical Diagnostics of an Atmospheric Plasma Jet System

Nwankire

Law

Nindrayog³

et al. 2010

Plasma Chem Plasma Process

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show abstract

“…One of the attractive features of a non-thermal atmosphericpressure plasma is the ability to produce a large amount of reactive species without the need for elevated gas temperatures [1,2]. Since the gas temperature in an atmospheric-pressure plasma remains relatively low, the plasma does not cause any thermal damage to the sensitive surface it comes in contact with.…”

Section: Introductionmentioning

confidence: 99%

Influence of air diffusion on the OH radicals and atomic O distribution in an atmospheric Ar (bio)plasma jet

Nikiforov

Britun

et al. 2014

Plasma Sources Sci. Technol.

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Treatment of samples with plasmas in biomedical applications often occurs in ambient air. Admixing air into the discharge region may severely affect the formation and destruction of the generated oxidative species. Little is known about the effects of air diffusion on the spatial distribution of OH radicals and O atoms in the afterglow of atmospheric-pressure plasma jets. In our work, these effects are investigated by performing and comparing measurements in ambient air with measurements in a controlled argon atmosphere without the admixture of air, for an argon plasma jet. The spatial distribution of OH is detected by means of laser-induced fluorescence diagnostics (LIF), whereas two-photon laser-induced fluorescence (TALIF) is used for the detection of atomic O. The spatially resolved OH LIF and O TALIF show that, due to the air admixture effects, the reactive species are only concentrated in the vicinity of the central streamline of the afterglow of the jet, with a characteristic discharge diameter of ∼1.5 mm. It is shown that air diffusion has a key role in the recombination loss mechanisms of OH radicals and atomic O especially in the far afterglow region, starting up to ∼4 mm from the nozzle outlet at a low water/oxygen concentration. Furthermore, air diffusion enhances OH and O production in the core of the plasma. The higher density of active species in the discharge in ambient air is likely due to a higher electron density and a more effective electron impact dissociation of H 2 O and O 2 caused by the increasing electrical field, when the discharge is operated in ambient air.

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“…On the other hand, the DBD discharges are predestined for applications of large volume plasma chemistry. Barrier discharges, also referred as silent discharges are characterized by the presence of at least one insulating layer between two planar or cylindrical electrodes connected to an ac power supply [1]. The main advantage of this type of electrical discharge is that non-equilibrium plasma conditions in atmospheric pressure gases can be established in an economic and reliable way.…”

Section: Introductionmentioning

confidence: 99%

“…The main advantage of this type of electrical discharge is that non-equilibrium plasma conditions in atmospheric pressure gases can be established in an economic and reliable way. This feature has led to a number of important DBD applications including industrial ozone generation [1], pollution control [2], plasmachemical vapour deposition and surface activation [3], excitation of excimer lamps, and more recently surface modification of diverse materials [4].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of dielectric barrier discharge reactor for material treatment

et al. 2009

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This work reports the development of atmospheric pressure plasma reactor with dielectric barrier discharge DBD for material treatment. The DBD discharge has been generated in planar geometry reactor powered by ac voltage provided by conventional high voltage transformer. The dielectric barrier consisted of two glass slabs, which cover both reactor electrodes. The air discharge gap between the dielectric layers was varied from 1.0 to 3.0mm. The power consumption of the DBD reactor was evaluated by the Lissajous figures method. The optimization of reactor geometry for material processing is discussed.

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Filamentary, patterned, and diffuse barrier discharges

Cited by 653 publications

References 92 publications

Electrical, Thermal and Optical Diagnostics of an Atmospheric Plasma Jet System

Electrical, Thermal and Optical Diagnostics of an Atmospheric Plasma Jet System

Influence of air diffusion on the OH radicals and atomic O distribution in an atmospheric Ar (bio)plasma jet

Characteristics of dielectric barrier discharge reactor for material treatment

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