Optical emission characteristics of atmospheric-pressure nonequilibrium microwave discharge and high-frequency DC pulse discharge plasma jets
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Author list: Yuji T., Fujii S., Mungkung N., Akatsuka H.
Publisher: Institute of Electrical and Electronics Engineers
Publication year: 2009
Journal: IEEE Transactions on Plasma Science (0093-3813)
Volume number: 37
Issue number: 6 PART 1
Start page: 839
End page: 845
Number of pages: 7
ISSN: 0093-3813
eISSN: 1939-9375
Languages: English-Great Britain (EN-GB)
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Abstract
With an aim to understand the mechanism of surface processing by atmospheric-pressure nonequilibrium discharge plasma jets, we measured the vibrational and rotational temperatures in the plasmas by means of optical emission spectroscopy (OES) measurement method. This paper focuses on the OES measurement method using a torch-shaped atmospheric-pressure nonequilibrium discharge plasma jet power supply consisting of a microwave (2.45-GHz) generator and a high-frequency (5.0-10-kHz) dc pulse power supply, using a gas mixture of Ar (8.0 L/ min) and N2 (0.1-0.5 L/min) as the discharge plasma gas, and changing the flow rate of N2 gas at the input power of 100-150 W. Upon comparing vibrational and rotational temperatures (0.18-0.27 eV) determined from the OES measurement method using two types of atmospheric-pressure nonequilibrium discharge plasma jets, results indicate that the microwave discharge plasma jet has considerably low vibrational and rotational temperatures. ฉ 2009 IEEE.
Keywords
Ar + N2 mixture gas, High-frequency dc pulse, Vibrational and rotational temperatures
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