Abstract

In this work, we report the acoustic measurements performed on an atmospheric-pressure plasma jet (APPJ) ignited at various electrical conditions, and attempt to describe the origin of plasma-generated sound waves. The working principle of the APPJ source used for this investigation was based on a DC-pulsed dielectric barrier discharge in a helium flow. Our results indicated that the sound is generated in the plasma core in a glass tube between two cylindrical electrodes, rather than in the plasma jet that extends into the open atmosphere. We also explored the electrical conditions at which the sound level is below 85 dBA; that is, still within the safe level recommended by the National Institute for Occupational Safety and Health. Therefore, our findings can be used to advance our basic and applicable knowledge of APPJs.

Graphical abstract

中文翻译：

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大气压介质阻挡放电等离子体射流的声学特性

摘要

在这项工作中，我们报告了在各种电气条件下点燃的大气压等离子体射流（APPJ）上进行的声学测量，并试图描述等离子体产生的声波的起源。用于此研究的APPJ源的工作原理基于氦流中的直流脉冲介电势垒放电。我们的结果表明，声音是在两个圆柱形电极之间的玻璃管中的等离子体芯中产生的，而不是在延伸到开放大气中的等离子体射流中产生的。我们还研究了声级低于85 dBA的电气条件。即仍处于国家职业安全与健康研究所推荐的安全水平内。因此，我们的发现可用于增进我们对APPJ的基本知识和适用知识。

图形概要