噴流型大気圧プラズマ発生装置におけるプラズマバレット観測の試み

概要

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In this work, an atmospheric pressure plasma source was experimentally constructed by a coaxial arrangement with a discharge electrode and a dielectric tube of 6 mm in an inner diameter. The atmospheric pressure plasma was formed in a noble gas (He) stream exposed to dielectric barrier discharges on AC high-voltage applications. The axial plasma propagation was evaluated from the high-speed photograph and the inductive current. The plasma ignited by the barrier discharges was observed as a plasma bullet traveling from the discharge electrode to ambient air. The velocity of plasma bullet was hypersonic of 3×103 ∼ 8×103 m/s. The velocity varied according to time and traveling length. The optically identified characteristic of plasma propagation indicated the same tendency as time and space resolved profiles of the plasma bullet travelling which was observed utilizing a Rogowski coil as the current monitor. The plasma density was evaluated from the inductive current of plasma bullets along the gas stream axis, and the plasma density was in the order of 1016 m-3.
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