A pulsed plasma jet with the various Ar/N2 mixtures

A Barkhordari,A Ganjovi,M N Rostami Ravari,I Mirzaei,A Falahat

doi:10.1007/s40094-017-0271-y

Abstract

In this paper, using the Optical Emission Spectroscopy technique, the physical properties of a fabricated pulsed DBD plasma jet are studied. Ar/N2 gaseous mixture is taken as operational gas, and Ar contribution in Ar/N2 mixture is varied from 75 to 95%. Through the optical emission spectra analysis of the pulsed DBD plasma jet, the rotational, vibrational and excitation temperatures and density of electrons in plasma medium of the pulsed plasma jet are obtained. It is seen that, at the wavelength of 750.38 nm, the radiation intensity from the Ar 4p → 4 s transition increases at the higher Ar contributions in Ar/N2 mixture. It is found that, for 95% of Ar presence in the mixture, the emission intensities from argon and molecular nitrogen are higher, and the emission line intensities will increase nonlinearly. In addition, it is observed that the quenching of Ar* by N2 results in the higher intensities of N2 excited molecules. Moreover, at the higher percentages of Ar in Ar/N2 mixture, while all the plasma temperatures are increased, the plasma electron density is reduced.

Highlights

In recent years, the cold atmospheric pressure plasma jets have attracted much attention in the various fields of science and technological applications [1,2,3,4,5,6,7,8,9]
Ar/N2 gaseous mixture is taken as operational gas, and Ar contribution in Ar/N2 mixture is varied from 75 to 95%
Plasma discharges at the atmospheric pressures are practically used owing to their simplicity and low manufacturing cost [10]

Summary

Introduction

The cold atmospheric pressure plasma jets have attracted much attention in the various fields of science and technological applications [1,2,3,4,5,6,7,8,9]. Khan et al [12] investigated the basic plasma discharge features of an RF plasma discharge medium with the Ar/N2 gaseous mixture at the low pressures They found that the electron temperature is maximized at about 1.8 eV. The input power was varied between 175 and 225 W, and the filling pressure was kept between 7 and 9 mbar They observed that, the molecular nitrogen emission lines intensity and plasma temperature will increase at the higher argon contribution in Ar/N2 mixture. The percentage of argon in Ar/N2 mixture is varied, and the plasma electron density, rotational, vibrational and excitation temperatures are calculated by analyzing the obtained optical emission spectra from the discharge medium of the pulsed DBD plasma jet

Experimental setup

Conclusions

Findings

48. National Institute of Standards and Technology 1979-2008 NIST