The group "Allgemeine Elektrotechnik und Plasmatechnik" at the faculty for engineering and information science.

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Characterisation of volume and surface dielectric barrier discharges in N2–O2 mixtures using optical emission spectroscopy

A volume and a twin surface dielectric barrier discharge (VDBD and SDBD) are generated in different nitrogen–oxygen mixtures at atmospheric pressure by applying damped sinusoidal voltage waveforms with oscillation periods in the microsecond time scale. Both electrode configurations are located inside vacuum vessels and operated in a controlled atmosphere to exclude the influence of surrounding air. The discharges are characterised with different spatial and temporal resolution by applying absolutely calibrated optical emission spectroscopy in conjunction with numerical simulations and current–voltage measurements. Plasma parameters, namely the electron density and the reduced electric field, and the dissipated power are found to depend strongly on the oxygen content in the working gas mixture. Different spatial and temporal distributions of plasma parameters and dissipated power are explained by surface and residual volume charges for different O2 admixtures due to their effects on the electron recombination rate. Thus, the oxygen admixture is found to strongly influence the breakdown process and plasma conditions of a VDBD and a SDBD.

FieldValue
Publisher
Authors
Release Date
2021-01-29
Resources
Identifier
81654b14-f843-4e6c-81c3-cfe3f94e8074
Permanent Identifier (URI)
Is supplementing
Plasma Source Name
Plasma Source Application
Plasma Source Specification
Plasma Source Properties
For both the VDBD and the SDBD electrode configuration, a suitable vacuum vessel made of aluminium is used and connected to a miniature flow passage, which consists of KF25 vacuum parts. Both vessels provide optical access via several synthetic quartz windows, transparent in the spectral range from 200 to 1100 nm (Viosil SQ, GVB, Germany). Feed gas is supplied via two mass flow controllers (Bronkhorst El‐Flow Prestige, Bronkhorst, Germany). Nitrogen and oxygen (Air Liquide, Germany) with purity 5.0 are used as feed gas in this study. In detail, the different nitrogen–oxygen gas mixtures are chosen as follows: 1:0, 0.8:0.2, 0.5:0.5 and 0.2:0.8. The total gas flow amounts to 2 slm for the VDBD vessel and to 10 slm for the SDBD vessel. In both DBD setups, one electrode is grounded. High voltage (HV) pulse sequences, which correspond to a damped sine wave with a μs rise time, are applied to one of the electrodes. The trigger frequency is 1000 Hz for both DBDs in this study. VDBD: A self‐built pulsed power supply is used for the VDBD setup. The electrode has a diameter of 10 mm and is placed in the middle of the vacuum vessel. The working distance between the driven and the counter electrode is set to 1 mm. The circular, counter electrode is made of aluminium and is covered by a glass slide. SDBD: A customised modified Redline G2000 plasma generator with an external transformer is employed for the SDBD setup. The SDBD is made of an aluminium oxide plate (190 mm × 88 mm × 0.635 mm) functioning as a dielectric barrier with grid‐structured copper traces placed on each side of the dielectric.
Plasma Source Procedure
Different nitrogen–oxygen gas mixtures were chosen: 1:0, 0.8:0.2, 0.5:0.5 and 0.2:0.8 at atmospheric pressure. Total gas flow amounts to 2 slm for the VDBD vessel and to 10 slm for the SDBD vessel.
Plasma Medium Name
Plasma Medium Properties
Different nitrogen–oxygen gas mixtures were chosen: 1:0, 0.8:0.2, 0.5:0.5 and 0.2:0.8 at atmospheric pressure. Total gas flow amounts to 2 slm for the VDBD vessel and to 10 slm for the SDBD vessel.
Plasma Medium Procedure
Before gas mixtures were changed, the vessel was completely evacuated, to minimise impurities.
Plasma Target Name
Plasma Target Properties
VDBD: The circular, counter electrode is made of aluminium and is covered by a glass slide.
Plasma Diagnostic Properties
Capacitive voltage divider (P6015A; Tektronix) Current monitor (Model 2877; Pearson Electronics) Digital oscilloscope (LeCroy9459 DUAL 350 MHz; LeCroy) Echelle spectrometer (ESA 4000; LLA Instruments, Germany) Intensified charge‐coupled camera (ICCD, 4 Picos; Stanford Computer Optics) Bandpass filter (380FIB50 and 390FIB50; Knight Optical, UK)
Plasma Diagnostic Name
Language
English (United Kingdom)
License
Public Access Level
Public
Funding Agency
Project
Contact Name
F. Kogelheide
Contact Email

Data and Resources

Project Contact Name: 
P. Awakowicz