Diagnostics of atmospheric pressure capillary DBD oxygen plasma jet

TL;DR

This paper develops and characterizes an atmospheric pressure oxygen plasma jet using optical and electrical methods, analyzing how operational parameters affect plasma properties and testing its effectiveness against Fusarium oxysporum on potatoes.

Contribution

It introduces a capillary dielectric barrier oxygen plasma jet and provides detailed analysis of its properties and potential agricultural applications, which is novel in plasma diagnostics.

Findings

Gas and rotational temperatures decrease with higher oxygen flow rate.

Electron density increases with voltage and flow rate.

Discharge frequency varies inversely with flow rate and directly with voltage.

Abstract

Atmospheric pressure capillary dielectric barrier oxygen discharge plasma jet is developed to generate non-thermal plasma using unipolar positive pulse power supply. Both optical and electrical techniques are used to investigate the characteristics of the produced plasma as function of applied voltage and gas flow rate. Analytical results obtained from the optical emission spectroscopic data reveal the gas temperature, rotational temperature, excitation temperature and electron density. Gas temperature and rotational temperature are found to decrease with increasing oxygen flow rate but increase linearly with applied voltage. It is exposed that the electron density is boosting up with enhanced applied voltage and oxygen flow rate, while the electron excitation temperature is reducing with rising oxygen flow rate. Electrical characterization demonstrates that the discharge frequency is falling with flow rate but increasing with voltage. The produced plasma is applied preliminarily to study the inactivation yield of Fusarium oxysporum infected potato samples.