Pramana | |
Parametric study of radiofrequency helium discharge under atmospheric pressure | |
SHANAWER NIAZ1  MANZOOR AHMAD BADAR1  SAFDAR HUSSAIN11  HAFIZ IMRAN AHMAD QAZI1  | |
[1] Department of Physics, University of Sargodha, 40100 Sargodha, Pakistan$$ | |
关键词: Atmospheric pressure glow discharge; radiofrequency; excitation temperature; gas temperature.; | |
DOI : | |
学科分类:物理(综合) | |
来源: Indian Academy of Sciences | |
【 摘 要 】
The parameters of radio frequency helium discharge under atmospheric pressure were studied by electrical and optical measurements using high voltage probe, current probe and optical emission spectroscopy. Two discharge modes $alpha$ and $gamma$ were observed within certain limits. During $alpha$ to $gamma$ mode transition, a decrease in voltage (280–168 V), current (2.05–1.61 A) and phase angle (76$^{m o}-56^{m o}$) occurred. The discharge parameters such as resistance, reactance, sheath thickness, electron density, excitation temperature and gas temperature were assessed by electrical measurements using equivalent circuit model and optical emission spectroscopy. In $alpha$ mode, the discharge current increased from 1.17 to 2.05 A, electron density increased from $0.19 imes 10^{12} {m to} 0.47 imes 10^{12} {m cm}^{−3}$ while sheath thickness decreased from 0.40 to 0.25 mm. The excitation temperatures in the $alpha$ and $gamma$ modes were 3266 and 4500 K respectively, evaluated by Boltzmann’s plot method. The estimated gas temperature increased from 335 K in the α mode to 485 K in the γ mode, suggesting that the radio frequency atmospheric pressure helium discharge can be used for surface treatment applications.
【 授权许可】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO201912040499474ZK.pdf | 430KB | download |