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Acoustic emission within an atmospheric helium discharge jet

机译：大气氦气排放射流内的声发射

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This paper describes the thermal gas effluent and ion acoustic pressure wave interaction between the fundamental drive frequency and its harmonics within an atmospheric helium discharge. Deconvolution of the acoustic signal and the electrical signals reveal that the plasma jet undergoes a change in operational mode from chaotic (where the plasma is spatially and temporally inhomogeneous at the electrode surface) to stable (periodic in nature) when the plasma expands away from the electrodes and into the reactor cylinder. This effect is strongly influence by the helium flow and input power. In addition the generated acoustic signals is found to have a frequency response to that of a closed-end cylinder column which supports antinodes of n = 1 and 3. Decoding of the acoustic signal allows the helium thermal gas temperature to be obtained: T_(gas gas) ～ 290 K. The signal allows the axial gap distance between the jet nozzle and work surface to be estimated which has technology importance in terms of plasma metrology and in the basic understanding of atmospheric pressure plasma jet physics.
机译：本文介绍了大气氦气排放内基本驱动频率及其谐波之间的热气流流出和离子声压波相互作用。声信号和电信号的去卷积揭示了等离子体射流从混沌（其中等离子体在电极表面在电极表面上空间上且时间上不均匀地在电极上不均匀地）进行操作模式的变化，以便在等离子体远离时稳定（周期性）电极和反应器圆​​柱体。这种效果受到氦气流量和输入功率的强烈影响。另外，发现所产生的声学信号具有对闭端圆柱柱的频率响应，其支持n = 1和3的抗腹炎。声音信号的解码允许获得氦热气温度：T_（气体气体）〜290 K.该信号允许估计喷射喷嘴和工作表面之间的轴向间隙距离，这在血浆计量和大气压等离子体喷射物理学的基本理解中具有技术重要性。

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