Optical Emission Spectroscopic Studies on Atmospheric Electrodeless Microwave Plasma in Carbon Dioxide-Hydrogen Mixture
- Authors
- 임성균
- Issue Date
- 12월-2017
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Citation
- IEEE TRANSACTIONS ON PLASMA SCIENCE, v.45, no.12, pp.3154 - 3159
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON PLASMA SCIENCE
- Volume
- 45
- Number
- 12
- Start Page
- 3154
- End Page
- 3159
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/139798
- DOI
- 10.1109/TPS.2017.2767571
- ISSN
- 0093-3813
- Abstract
- Optical emission spectroscopic measurements were performed on atmospheric pressure electrodeless microwave plasmas produced in a 95% carbon dioxide-5% hydrogen mixture. The rotational and vibrational temperatures of the plasma were determined by measuring the C-2 Swan band spectra at wavelengths in the ranges of 500-517 and 548-565 nm. The electron number density of the plasma was deduced by measuring the Stark broadening of the hydrogen Balmer-beta line shape at 486.13 nm. The microwave power was fixed at 2 kW, and the flow rate was varied from 5 to 20 standard liter per minute. The difference between the rotational and vibrational temperatures was found to be negligible. The temperatures reached 6200 (+/- 200) K and were independent of the flow rate. The electron number densities of the plasmas were estimated to be approximately 2.06 (+/- 0.12) x 10(14) cm(-3). Thermodynamic-equilibrium calculations indicated that the temperature corresponding to the measured electron density was 6221 (+/- 200) K, which is almost the same as the temperatures measured according to the C-2 Swan band spectra. Therefore, the electron temperature was nearly the same as the gas temperature, and the plasma was in local thermal equilibrium.
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