Electron Temperature and Density Measurement of Plasma Jet in Atmospheric Pressure (original) (raw)
Related papers
Investigation on Parameters of Atmospheric Pressure Plasma Jet by Electrical and Optical Methods
2020
The atmospheric pressure plasma jet works under atmospheric pressure condition, has been developed for surface treatment and biomedical applications. The produced jet has been characterized by electrical and optical methods. To characterize cold atmospheric argon plasma discharge, its electron density, and electron energy (temperature) at various conditions have been estimated by using different techniques such as power balance, stark broadening, and intensity ratio methods respectively. Atmospheric pressure plasma jet (APPJ) has drawn much attention all over the world due to its applications in material processing, biomedical material processing, and thin film deposition. APPJ has been produced, using a high voltage and high frequency power supply (0-20 kV) and an operating frequency of 20 kHz. Results showed that the electron density was of the order of 10 14 cm -3 and 10 16 cm -3 as determined by power balance, intensity ratio, and stark broadening methods respectively while elec...
IEEE, 2015
A micro-discharge air plasma jet was developed operated at low frequency (50 Hz) ac high voltage (kV). The micro-discharge plasma jet was generated by feeding air through a dielectric installed between two disk-shaped electrodes with a hole of 1 mm diameter in the center. Both of the electrodes were made of copper. The micro-discharge in the dielectric is evolved as a plasma jet from the outer electrode through its hole. The ac power supply was a neon light transformer. Optical emission spectroscopy was employed to study the plasma discharge characteristics. The Specair software was used to analyze the collected spectrum. The reduced electric field and electron density of plasma as well as rotational and vibrational temperatures, referring to ion or gas and electron temperature respectively were measured by processing emission spectrum.
Physics of Plasmas, 2013
Low-temperature, high-pressure plasma jets have an extensive use in medical and biological applications. Much work has been devoted to study these applications while comparatively fewer studies appear to be directed to the discharge itself. In this work, in order to better understand the kind of electrical discharge and the plasma states existing in those devices, a study of the electrical characteristics of a typical plasma jet, operated at atmospheric pressure, using either air or argon, is reported. It is found that the experimentally determined electrical characteristics are consistent with the model of a thermal arc discharge, with a highly collisional cathode sheet. The only exception is the case of argon at the smallest electrode separation studied, around 1 mm in which case the discharge is better modeled as either a non-thermal arc or a high-pressure glow. Also, variations of the electrical behavior at different gas flow rates are interpreted, consistently with the arc model, in terms of the development of fluid turbulence in the external jet. V
Electrical, thermal and optical diagnostics of an atmospheric Plasma jet system
2010
Plasma diagnostics of atmospheric plasmas is a key tool in helping to understand processing performance issues. This paper presents an electrical, optical and thermographic imaging study of the PlasmaStream atmospheric plasma jet system. The system was found to exhibit three operating modes; one constricted/localized plasma and two extended volume plasmas. At low power and helium flows the plasma is localized at the electrodes and has the electrical properties of a corona/filamentary discharge with electrical chaotic temporal structure. With increasing discharge power and helium flow the plasma expands into the volume of the tube, becoming regular and homogeneous in appearance. Emission spectra show evidence of atomic oxygen, nitric oxide and the hydroxyl radical production. Plasma activated gas temperature deduced from the rotational temperature of nitrogen molecules was found to be of order of 400 K: whereas thermographic imaging of the quartz tube yielded surface temperatures between 319 and 347 K.
Plasma Sources Science and Technology, 2014
An extensive electrical study was performed on a coaxial geometry atmospheric pressure plasma jet source in helium, driven by 30 kHz sine voltage. Two modes of operation were observed, a highly reproducible low-power mode that features the emission of one plasma bullet per voltage period and an erratic high-power mode in which micro-discharges appear around the grounded electrode. The minimum of power transfer efficiency corresponds to the transition between the two modes. Effective capacitance was identified as a varying property influenced by the discharge and the dissipated power. The charge carried by plasma bullets was found to be a small fraction of charge produced in the source irrespective of input power and configuration of the grounded electrode. The biggest part of the produced charge stays localized in the plasma source and below the grounded electrode, in the range 1.2-3.3 nC for ground length of 3-8 mm.
The atmospheric-pressure plasma jet: a review and comparison to other plasma sources
IEEE Transactions on Plasma Science, 1998
Atmospheric-pressure plasmas are used in a variety of materials processes. Traditional sources include transferred arcs, plasma torches, corona discharges, and dielectric barrier discharges. In arcs and torches, the electron and neutral temperatures exceed 3000 C and the densities of charge species range from 10 16 -10 19 cm 03 . Due to the high gas temperature, these plasmas are used primarily in metallurgy. Corona and dielectric barrier discharges produce nonequilibrium plasmas with gas temperatures between 50-400 C and densities of charged species typical of weakly ionized gases. However, since these discharges are nonuniform, their use in materials processing is limited. Recently, an atmospheric-pressure plasma jet has been developed, which exhibits many characteristics of a conventional, low-pressure glow discharge. In the jet, the gas temperature ranges from 25-200 C, charged-particle densities are 10 11 -10 12 cm 03 , and reactive species are present in high concentrations, i.e., 10-100 ppm. Since this source may be scaled to treat large areas, it could be used in applications which have been restricted to vacuum. In this paper, the physics and chemistry of the plasma jet and other atmospheric-pressure sources are reviewed.
Plasma Sources Science and Technology
This paper quantitatively characterizes a kHz atmospheric pressure He plasma jet without target powered by a pulse of positive applied voltage. It focuses on a quantitative comparison between experimental measurements and numerical results of a two-dimensional fluid model using the same configuration, for different values of magnitude and width of pulsed applied voltage. Excellent agreement is obtained between experiments and simulations on the gas mixture distribution, the length and velocity of discharge propagation and the electric field in the discharge front. For the first time in the same jet, the experimentally measured increase of the electric field in the plume is confirmed by the simulations. The electron density and temperature, measured behind the high field front, are found to agree qualitatively. Moreover, the comparison with simulations shows that discharge propagation stops when the potential in the discharge head is lower than a critical value. Hence, pulse width and magnitude allow to control propagation length. For long pulses (≥ 1000 ns), the potential in the discharge front reaches this critical value during the pulse. For shorter pulses, propagation is determined
Evaluate the argon plasma jet parameters by optical emission spectroscopy
In this study, a method for experimentally evaluating the plasma parameters in the Argon plasma jet system with varying rates of Argon gas flow from 1 to 5 L/min operating at constant voltage and normal atmospheric pressure. This study is based on optical emission spectroscopy (OES). Spectroscopic diagnostic method using the Boltzmann plot to calculate these parameters measured. Generally, the results show the value of Te ranged from 1.53 to 1.78 (eV) depending on the gas flow rates, electron density ranges from 2.63 to 3.12 Â 10 17 (cm À3). The plasma parameters such as (λ D , N D , and ω p) related to electron temperature and electron density was also measured. The plasma was produced at a different flow rate the impacts on Debye length, plasma frequency, and the number of particles on the surface of Debye, all of which rise with an increase in gas flow rate, are significantly influenced by an increase in gas flow rate on the plasma properties of the density and temperature of an electron.
Atmospheric Plasma Jet: Effect of Inner Diameter Size to the Length of Plasma Discharge
Walailak Journal of Science and Technology (WJST)
The design of atmospheric plasma jet is basically using the combination of a noble gases, potential difference and a good dielectric material. In this work, we used quartz glass tube as a dielectric material with different inner diameter size to investigate the effect on the plasma discharge. We studied the changes of plasma discharge by observing the discharge lengths. We introduced a gas flow rate of 1000 ml/min and maximum inner diameter of dielectric material of 10 mm. Results showed that the discharge length are capable of reaching 30 mm and having various excited plasma species shown through optical emission spectrum.
IOP, 2020
: In this study, the emission spectra of plasma generated from the argon gas in a plasma jet system were measured under normal atmospheric pressure, at constant voltage and for different flow rates from 1–5L/min. The plasma parameters were calculated based on electron density, frequency of plasma, the temperature of an electron, Debye length and the number of particles in the Debye sphere. We employed optical emission spectrometer (OES) technology, which captured the spectrum resulting from the plasma at various flow rates of argon gas. While the flow rate of argon gas to the plasma generated from the discharge current (D.C.) increased, the ranges of the temperature and density of the electron (Te) were 0.075– 0.1eV and 6.15–9.75x1017cm-3 , respectively. In contrast, a rise in the intensity of spectral lines was observed.