High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes) An International Journal

ISSN for PRINT: 1093-3611

For Online Access

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2003, Volume7

Issue 1

135 pages

DOI: 10.1615/HighTempMatProc.v7.i1

Issue price - $144.00

V. Sember
Institute of Plasma Physics, AS CR, Za Slovankou 3, P.O. Box 17, 182 21 Prague, Czech Republic

Methods of optical emission spectroscopy (OES) are used to determine basic parameters of the plasma jet such as temperature, electron number density, and mole fractions of plasma components. The analysis is based on the measurement of a large variety of argon, oxygen and hydrogen spectral lines in the whole visible spectral region for various operating conditions. The electron number density is determined from a profile of H_b line. The temperature is obtained from Boltzmann diagrams and from the ratio of atomic and ionic lines. A discrepancy is found in evaluation of the excitation temperature from certain argon ionic lines. The mole fraction of oxygen significantly decreases towards the jet centerline. This effect increases with increasing temperature gradient, and is explained mainly as a result of inhomogeneous mixing of argon and water in the stabilizing channel of the torch.

DOI: 10.1615/HighTempMatProc.v7.i1.30 Download article, 6 pages

Article price - $35.00

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