Investigation of the coplanar barrier discharge in synthetic air at atmospheric pressure by cross-correlation spectroscopy

Abstract

The barrier discharge in the coplanar arrangement operating in a single-filament mode was studied spectroscopically. The evolution of the discharge luminosity was measured by the technique of cross-correlation spectroscopy. The 1D-spatially and temporally resolved luminosities of the first negative (at 391.5 nm) and the second positive (at 337.1 nm) system of molecular nitrogen were recorded using the above-mentioned technique. A cathode-directed ionizing wave (IW) was clearly seen on the plot for radiation intensity at 337.1 nm. In addition to this, also observed was a wave of the enhanced electric field propagating over the anode. In this paper, the propagation of these waves is described and their velocities are determined. The discharge evolution is divided into three phases-the Townsend phase, the phase of the IWs propagation and the extinction phase. Since the above-mentioned luminosity distributions could be interpreted approximately as the electric field (for 391.5 nm) and the electron density (for 337.1 nm) distribution, the qualitative description of the discharge is made accordingly. All these parameters are compared with similar measurements of the volume discharge. Apart from this, an attempt to determine the reduced electric field is made according to the kinetic model.

Diffuse Coplanar Surface Barrier Discharge and its applications for in-line processing of low-added-value materials

“…To obtain a more detailed insight into the discharge formation mechanism our current efforts are focusing also on studying the dynamics of the elementary DCSBD discharge using a high speed camera [23] and the technique of spatially resolved cross-correlation spectroscopy [24].…”

Phase resolved cross-correlation spectroscopy on surface barrier discharges in air at atmospheric pressure

“…4) is observed. The phenomenon can be compared with the socalled anode glow, which is well known for VBDs and CBDs [6,20,21]. Behind the cathode directed ionization front electrons are drifting towards the anode.…”

Laser schlieren deflectometry for temperature analysis of filamentary non-thermal atmospheric pressure plasma

“…The contracted filaments often exhibit sub-millimeter dimensions and the estimation of radial temperature profiles is a subject of advanced approaches like fluid modeling, 6,7 or highly resolved spectroscopy, or interferometry. 8,9 Other experimental methods consider an interaction between the plasma and a calorimetric probe, 10 but they lose information on the locally resolved temperature profile by generating average values. Visualization methods like near-infrared thermography, schlieren monitoring, or rainbow a) Author to whom correspondence should be addressed.…”