Electrical, Thermal and Optical Diagnostics of an Atmospheric Plasma Jet System
Plasma diagnostics of atmospheric plasmas is a key tool in helping to understand processing performance issues. This paper presents an electrical, optical and thermographic imaging study of the PlasmaStream atmospheric plasma jet system. The system was found to exhibit three operating modes; one constricted/localized plasma and two extended volume plasmas. At low power and helium flows the plasma is localized at the electrodes and has the electrical properties of a corona/filamentary discharge with electrical chaotic temporal structure. With increasing discharge power and helium flow the plasma expands into the volume of the tube, becoming regular and homogeneous in appearance. Emission spectra show evidence of atomic oxygen, nitric oxide and the hydroxyl radical production. Plasma activated gas temperature deduced from the rotational temperature of nitrogen molecules was found to be of order of 400 K: whereas thermographic imaging of the quartz tube yielded surface temperatures between 319 and 347 K.
KeywordsPlasma jet Diagnostics Plasma diagnostics Optical emission Infrared thermography Corona
This work is supported by Science Foundation Ireland Grant 08/SRC11411 and Enterprise Ireland grant CFDTD/7/IT/304. A Nindrayog was supported by a Northern Ireland Department of Education and Learning MSc studentship. V. Milosavljevic acknowledges support by Enterprise Ireland and the Ministry of Science and Technological Development of the Republic of Serbia.
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