Investigations of an atmospheric pressure plasma jet by optical emission spectroscopy

Förster, Stefan; Mohr, Christian; Viöl, Wolfgang

doi:10.1016/j.surfcoat.2005.02.217

Cited by 131 publications

(68 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Given the gas flow within the discharge tube is in the laminar flow regime (section''Characterization of discharge power as a function of helium flow''), Newton's law of heat transfer can be used to estimate the forced convection heat loss via helium flow see (4) and reference [21].…”

Section: Estimate Of Heat Loss Through Gas Flowmentioning

confidence: 99%

“…One of the most widely used APP applicators is the tube design which includes: the plasma jet [4,5], plasma needle [6], plasma pencil [7], and microplasma jet [8]. The plasma operational modes of these tube sources are influenced by their electrode configuration, gas flow rate, gas type, applied power and the distance between the plasma applicator nozzle and treated surface [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electrical, Thermal and Optical Diagnostics of an Atmospheric Plasma Jet System

Nwankire

Law

Nindrayog³

et al. 2010

Plasma Chem Plasma Process

View full text Add to dashboard Cite

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.

show abstract

Section: Estimate Of Heat Loss Through Gas Flowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrical, Thermal and Optical Diagnostics of an Atmospheric Plasma Jet System

Nwankire

Law

Nindrayog³

et al. 2010

Plasma Chem Plasma Process

View full text Add to dashboard Cite

show abstract

“…A 0.1% argon trace gas was added into the helium feed gas and a Boltzmann plot was created from the emission of relevant Ar I and Ar II lines. 22 Figure 4 shows the frequency dependence of T ex at a constant input power of 45 W / cm 3 . From 30 to 80 MHz, the excitation temperature was found to decrease slightly from 0.95 to 0.917 eV, a 3.5% reduction.…”

mentioning

confidence: 99%

Atmospheric glow discharges from the high-frequency to very high-frequency bands

Walsh

Iza

Kong

2008

Applied Physics Letters

View full text Add to dashboard Cite

This letter reports an experimental investigation of an atmospheric glow discharge in both the high-frequency (HF) band of 3–30 MHz and the very high frequency band of 30–300 MHz. At constant input power, increased frequency is found to change little the electron density and to reduce slightly the electron excitation temperature. Significantly, an eightfold frequency increase from 20 to 80 MHz leads to a 20-fold increase in the maximum plasma power without plasma constriction. The maximum power density of 355 W/cm3 achieved at 80 MHz is far greater than those reported in the HF band.

show abstract

“…A variety of plasma jets using a-c or pulsed power sources operating at quite different voltages, frequencies, and pulse widths, and with different working gases have been presented. For instance, Forster et al 5 presented a jet based on a dielectric barrier discharge (DBD) applying high voltage pulses (15 kV amplitude, 600 ns wide at a repetition rate of 25 kHz) and flowing Ar gas at a flow rate of about 4 l/min. The gas reached temperatures up to 100 C, but the tip of the plume could be touched with bare fingers.…”

Section: And References Therein)mentioning

confidence: 99%

Electrical studies and plasma characterization of an atmospheric pressure plasma jet operated at low frequency

et al. 2013

View full text Add to dashboard Cite

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 C 2013 AIP Publishing LLC.

show abstract

Investigations of an atmospheric pressure plasma jet by optical emission spectroscopy

Cited by 131 publications

References 3 publications

Electrical, Thermal and Optical Diagnostics of an Atmospheric Plasma Jet System

Electrical, Thermal and Optical Diagnostics of an Atmospheric Plasma Jet System

Atmospheric glow discharges from the high-frequency to very high-frequency bands

Electrical studies and plasma characterization of an atmospheric pressure plasma jet operated at low frequency

Contact Info

Product

Resources

About