Diagnostic by emission spectroscopy of an argon–hydrogen RF inductive thermal plasma for purification of metallurgical grade silicon

Benmansour, M.; Nikravech, Mehrdad; Morvan, Daniel; Amouroux, J.; Chapelle, J.

doi:10.1088/0022-3727/37/21/005

Cited by 22 publications

(15 citation statements)

References 18 publications

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“…Nonthermal atmospheric plasma jets have recently attracted growing interest, motivated by their considerable application potentials for material modification [1][2][3] and biomedical applications. 4,5 These plasma sources can be generated with sinusoidal excitation at 60 Hz, 6 kHz, 5,[7][8][9][10] MHz, 1,4,[11][12][13][14] and with repetitive nanosecond pulses at kilohertz.…”

Section: Introductionmentioning

confidence: 99%

A hypersonic plasma bullet train traveling in an atmospheric dielectric-barrier discharge jet

et al. 2008

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An experimental observation of fast-moving plasma bullets produced in an atmospheric dielectric-barrier discharge jet is reported in this paper. Nanosecond imaging suggests that the atmospheric discharge jet consists of a plasma bullet train traveling at a hypersonic speed from 7.0km∕sto43.1km∕s. Yet on a millisecond scale, the bullet train appears as a plasma jet of several centimeters long. The plasma bullets are produced through several possible mechanisms, the most likely of which is related to the ionization wave. Time and space resolved optical emission spectroscopy show that reactive plasma species can be delivered to different spatial sites with varying quantities.

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Section: Introductionmentioning

confidence: 99%

A hypersonic plasma bullet train traveling in an atmospheric dielectric-barrier discharge jet

et al. 2008

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“…In the past few years, numerous works have been carried out on the study of the plasma jet properties by means of the emission spectroscopic technique [9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Electrical and spectroscopic diagnostic of an atmospheric double arc argon plasma jet

Chéron

Yan

et al. 2007

Plasma Sources Sci. Technol.

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An atmospheric argon plasma jet generated by an original dc double anode plasma torch has been investigated through its electrical and spectroscopic diagnostics. The arc instabilities and dynamic behavior of the argon plasma are analyzed using classical tools such as the statistical method, fast Fourier transform (FFT) and correlation function. The takeover mode is identified as the fluctuation characteristic of the double arc argon plasma jet in our experiment. The FFT and correlation analysis of electrical signals exhibit the only characteristic frequency of 150 Hz, which originates from the torch power and is independent of any change in the operating parameters. No high frequency fluctuations (1-15 kHz) are observed. This indicates that the nature of fluctuations in an argon plasma jet is induced mainly by the undulation of the tri-phase rectified power supply. It is found that each arc root attachment is diffused rather than located at a fixed position on the anode wall. Moreover, the emission spectroscopic technique is performed to determine the electron temperature and number density of the plasma jet inside and outside the arc chamber. Along the torch axis, the measured electron temperature and number density of the double arc argon plasma drop from 12 300 K and 7.6 × 10 22 m −3 at the divergent part of the first anode nozzle, to 10 500 K and 3.1 × 10 22 m −3 at the torch exit. In addition, the validity criteria of the local thermodynamic equilibrium (LTE) state in the plasma arc are examined. The results show that the measured electron densities are in good agreement with those calculated from the LTE model, which indicates that the double arc argon plasma at atmospheric pressure is close to the LTE state under our experimental conditions.

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“…(2). It is worth pointing out that the Saha-Boltzmann equation given by Benmansour et al [5] is somewhat different from Eq. (2).…”

Section: Electron Number Densitymentioning

confidence: 81%

Time-Resolved Emission Spectroscopic Study of Laser-Induced Steel Plasmas

Shah¹,

Pulhani²,

Suri³

et al. 2013

Plasma Sci. Technol.

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Laser-induced steel plasma is generated by focusing a Q-switched Nd:YAG visible laser (532 nm wavelength) with an irradiance of ∼ 1 × 10 9 W/cm 2 on a steel sample in air at atmospheric pressure. An Echelle spectrograph coupled with a gateable intensified charge-coupled detector is used to record the plasma emissions. Using time-resolved spectroscopic measurements of the plasma emissions, the temperature and electron number density of the steel plasma are determined for many times of the detector delay. The validity of the assumption by the spectroscopic methods that the laser-induced plasma (LIP) is optically thin and is also in local thermodynamic equilibrium (LTE) has been evaluated for many delay times. From the temporal evolution of the intensity ratio of two Fe I lines and matching it with its theoretical value, the delay times where the plasma is optically thin and is also in LTE are found to be 800 ns, 900 ns and 1000 ns.

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Diagnostic by emission spectroscopy of an argon–hydrogen RF inductive thermal plasma for purification of metallurgical grade silicon

Cited by 22 publications

References 18 publications

A hypersonic plasma bullet train traveling in an atmospheric dielectric-barrier discharge jet

A hypersonic plasma bullet train traveling in an atmospheric dielectric-barrier discharge jet

Electrical and spectroscopic diagnostic of an atmospheric double arc argon plasma jet

Time-Resolved Emission Spectroscopic Study of Laser-Induced Steel Plasmas

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