Analysis of Discharge Parameters in Xenon-Filled Coaxial Dbd Tube

Topics: Plasma, Capacitor, Plasma physics Pages: 16 (5038 words) Published: May 1, 2013


Analysis of Discharge Parameters in Xenon-Filled Coaxial DBD Tube Udit Narayan Pal, Member, IEEE, Pooja Gulati, Niraj Kumar, Mahesh Kumar, M. S. Tyagi, B. L. Meena, A. K. Sharma, and Ram Prakash

Abstract—In this paper, a xenon-filled coaxial dielectric barrier discharge (DBD) has been studied to understand the high-pressure nonequilibrium nonthermal plasma discharge. A quartz coaxial DBD tube (ID: 6 mm, OD: 12 mm) at 400-mbar xenon-filled pressure has been used in the experiment. A unipolar pulselike voltage up to a −6-kV peak working at 30 kHz has been applied to the discharge electrodes for the generation of microdischarges. A single discharge is observed per applied voltage pulse. Visual images of the discharge and electrical waveform confirm the diffused-type discharges. The knowledge obtained by dynamic processes of DBDs in the discharge gap explains quantitatively the mechanism that is obtained in the ignition, development, and extinction of DBDs. The behavior of different discharge parameters has also been analyzed. From the experimental results and equivalent electrical circuit, the dynamic nature of equivalent capacitance has been reported. The relative intensity analysis of the Xe peak in the optical emission spectra (172 nm) has also been carried out for different supplied powers, and it is found that the radiation power has increased with supplied power. Index Terms—Dielectric barrier discharge (DBD), equivalent capacitance, high-pressure plasma, ignition and extinction of discharge, nonequilibrium discharge, nonthermal discharge.

I. I NTRODUCTION HE HIGH-PRESSURE nonequilibrium nonthermal discharges based on dielectric barrier discharges (DBDs) are rapidly becoming an important technological component in medical and material processing applications. The DBDs, also referred to as silent discharges, are generated in discharge configuration with at least one dielectric barrier between two planar or cylindrical electrodes connected to an ac or pulse power supply. These dielectric layers act as a current limiter and prevent the formation of a spark or an arc discharge. It is established that the DBDs are the easy way to generate nonthermal and nonequilibrium plasma at atmospheric pressure [1]. The DBDs are also considered as promising alternatives to conventional mercury-based discharge plasmas producing highly efficient vacuum ultraviolet (VUV) and ultraviolet (UV) Manuscript received January 10, 2011; revised March 29, 2011; accepted April 1, 2011. Date of publication May 12, 2011; date of current version June 10, 2011. This work was supported by the CSIR Network Programme (NWP0024). U. N. Pal, P. Gulati, N. Kumar, M. Kumar, M. S. Tyagi, B. L. Meena, and A. K. Sharma are with the Microwave Tubes Division, Central Electronics Engineering Research Institute, Council of Scientific and Industrial Research, Pilani-333031, India (e-mail: R. Prakash is with the Birla Institute of Technology, Jaipur Campus, Jaipur302017, India (e-mail: Color versions of one or more of the figures in this paper are available online at Digital Object Identifier 10.1109/TPS.2011.2142197


radiations and have found a number of industrial applications ranging from plasma display panels to surface treatment [2]– [4]. The discharge appearance of DBDs can be either filamentary or homogeneous, depending on experimental conditions such as discharge gas, gas pressure, gas gap, dielectric surface properties, and applied voltage waveform [5]–[11]. Efficient excimer formation in DBDs is technically very important for use in high-power UV lamps. Excimer lamps are mercury-free systems and eco-friendly, and therefore, they are a boom for the lighting industry. Dielectric barrier-based discharges are traditionally driven by sinusoidal wave voltages with magnitudes in the kilovolt range and frequencies in...
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