Test facility for high pressure plasmas

Block, R.; Laroussi, Mounir; Schoenbach, K.H.

doi:10.1109/plasma.1999.829327

Cited by 3 publications

(3 citation statements)

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“…The electron density in the centre of the plasma column, which was measured as 10 13 cm −3 , is identical to that obtained by using measured current density and electrical field intensity values, and known values of the electron mobility [1]. The gas temperature values obtained through this method are comparable with those obtained by using emission spectroscopy of the second positive system of nitrogen [4]. The diagnostic technique described in this paper is suitable for the evaluation of a variety of partially ionized nonhomogenous high-pressure plasmas.…”

Section: Discussionsupporting

confidence: 75%

“…In order to provide for the required spatial resolution if was focused into the plasma, with a waist length of about 400 µm. The power density of the focused laser beam does not affect the plasma parameters, as was shown in a separate experiment where the phase shift for a given condition was found to be independent of the laser power density [4]. The plasma could be shifted transverse to the beam direction, (figure 2(a)) allowing us to scan the plasma column.…”

Section: Diagnostic Systemmentioning

confidence: 64%

“…Gas temperatures, measured by using the emission spectroscopy of rotational states are of the order of 2000 K [4]. The electron densities in the MHCD-sustained air glow were estimated to be 10 13 cm −3 at power densities of 5 kW cm −3 [2].…”

Section: Introductionmentioning

confidence: 99%

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Electron density measurements in an atmospheric pressure air plasma by means of infrared heterodyne interferometry

Leipold

Stark

El-Habachi

et al. 2000

J. Phys. D: Appl. Phys.

115

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An infrared heterodyne interferometer has been used to measure the spatial distribution of the electron density in direct current, atmospheric pressure discharges in air. Spatial resolution of the electron density in the high-pressure glow discharge with characteristic dimensions on the order of 100 µm required the use of a CO 2 laser at a wavelength of 10.6 µm. For this wavelength and electron densities greater than 10 11 cm −3 the index of refraction of the atmospheric air plasma is mainly determined by heavy particles rather than electrons. The electron contribution to the refractive index was separated from that of the heavy particles by taking the different relaxation times of the two particle species into account. With the discharge operated in a repetitive pulsed mode, the initial rapid change of the refractive index was assumed to be due to the increase in electron density, whereas the following slower rise is due to the decrease in gas density caused by gas heating. By reducing the time between pulses, direct current conditions were approached, and the electron density as well as the gas density, and gas temperature, respectively, were obtained through extrapolation. A computation inversion method was used to determine the radial distribution of the plasma parameters in the cylindrical discharge. For a direct-current filamentary discharge in air, at a current of 10 mA, the electron density was found to be 10 13 cm −3 in the centre, decreasing to half of this value at a radial distance of 0.21 mm. Gaussian temperature profiles with σ = 1.1 mm and maximum values of 1000-2000 K in the centre were also obtained with, however, larger error margins than for electron densities.

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Section: Discussionsupporting

confidence: 75%

Section: Diagnostic Systemmentioning

confidence: 64%