A simple device of generating glow discharge plasma in atmospheric pressure argon

Abstract

Atmospheric pressure glow discharge is realized in argon by using a plasma needle. With increasing the applied voltage, uniform plasma increases in scale from a small region near the needle tip to a plasma plume with a length of about 20 mm. The discharge mechanism is discussed based on the light emission waveforms from the plasma. Optical emission spectroscopy is used to determine excited electron temperature and vibrational temperature, and the results indicate that the excited electron temperature and the molecular vibrational temperature are about 6000 and 2300 K, respectively.

Spectroscopic Study of a Radio-Frequency Atmospheric Pressure Dielectric Barrier Discharge with Anodic Alumina as the Dielectric

“…For example, optical emissions at 811 nm, 826 nm, 841 nm, and 843 nm were found to be weak in an Ar RF APGD jet [2] . In an Ar kHz plasma needle [23] , the line observed at 750 nm was the strongest among all lines, including the lines at 697 nm and 772 nm, thus exhibiting an interesting contrast to the spectrum of Fig. 5.…”

Determination of the Electron Temperature of Atmospheric Pressure Argon Plasmas by Absolute Line Intensities and a Collisional Radiative Model

“…This paper deals with a plasma that is comparable to the one presented in another study and is devoted to the determination of one of the key parameter of the discharge: the electron temperature, T e . Commonly T e is determined is by using optical emission spectroscopy (OES) and especially the temperature derivation from the ratio of the intensities of two lines is popular . However, the information of this so‐called 2λ method is in many cases limited because of the two reasons: The excitation temperature, T exc , obtained with the 2λ method, is deduced from the ratios of two lines that originate from excited levels which are rather close to each other with energy difference in the order of 1 eV or even less.…”

“…Commonly T e is determined is by using optical emission spectroscopy (OES) and especially the temperature derivation from the ratio of the intensities of two lines is popular. [12][13][14] However, the information of this so-called 2l method is in many cases limited because of the two reasons: [15] The excitation temperature, T exc , obtained with the 2l method, is deduced from the ratios of two lines that originate from excited levels which are rather close to each other with energy difference in the order of 1 eV or even less. This means that the T exc determination cannot be very accurate.…”

Atmospheric pressure plasma jet in Ar and Ar/H2O mixtures: Optical emission spectroscopy and temperature measurements

“…Equation ͑11͒ allows estimating the T exc of the emission source from intensity ratio of the same atoms of neighboring 5 , and 2p 9 → 1s 5 / 2p 6 → 1s 5 , respectively, yielding to an excitation temperature of Ar 0.965 eV. The excitation temperature evaluated by line ratio technique taking into account the correction of the lines intensities due to self-absorption gives T exc , which is in good agreement with estimations of other authors for argon discharges in atmospheric pressure, e.g., Refs.…”

“…Atmospheric pressure plasma jets attract high attentions because of their potential interest for different technologies, such as polymer treatment, as well as of fundamental investigations of plasma. [1][2][3] Up until now few atmospheric pressure plasma systems have been developed such as rf or microwave torch [3][4][5][6] and arc discharges. 7 This paper presents a continuation of our work 8 that has been carried out on ac sustained plasma jet with focuses on studying the effect of addition of water to inlet gas.…”