Document Type : Original Article
Authors
1 Plasma and Fusion Research School, NSTRI, Tehran Iran
2 Department of Physics, Faculty of Science, Imam Khomeini International University, Qazvin, Iran
3 plasma and fusion research school, NSTRI, Tehran Iran
Abstract
Optical emission spectroscopy is known as a prevalent technique for plasma diagnostic which was applied in many experiments. The present research is important and considerable from two points of view. First, with accurate details, the spectroscopy of plasma plume has been analyzed and it was significant since internationally the plume temperature has been fewer investigated in comparison with the excited electrons temperature, and also is remarkable as regards in the national reports may be even not found such study. In the second view, considering in the non-transfer plasma torch design, the plasma plume temperature estimation and its characterization were substantial and necessary. These results are obtained using Boltzmann method and exact analysis of Fortrat curve and selection of P branch of curve known as first negative system N2+(B-X), based on the dominant Nitrogen molecules in air. By exact selection of rotational quantum numbers, regarding maximum spectrum intensities, the macroscopic plasma plume temperature, and excited electrons temperature were estimated 2000 (0.17 eV) and 6400 (0.5 eV) Kelvin respectively. The temperature results of this thermal torch sample are compared with international authoritative reports and also with thermodynamic approach in the similar condition and is in the minimum spectrum of temperature which was expectable. It means that, the macroscopic plume temperature is still far away from related thermal plasma near the excited electron temperature (more than 4000 K). Therefore, in order to design an desirable plasma torch with suitable electrodes and other parameters, and achievement to the 4000 K macroscopic temperature, it is in the minimum spectrum of temperature or efficiency and these obtained results is important and necessary for the precise design of a waste-incinerator torch pursuing with this purpose in the future.
Keywords
- Macroscopic temperature of plasma plume
- Non-transfer DC plasma torch
- Electron excited temperature
- Optical spectroscopy
Main Subjects
)