When a piezoelectric transformer (PT) is actuated by a low input voltage (∼10 V), electromechanical coupling leads to a very high (∼10 3 V) surface potential at the distal end that can ionize the surrounding gas and lead to a plasma jet emanating from the surface. PTs are attractive for non-equilibrium plasma generation because of their simple operation, low required input voltage, and low power consumption. In this work, the time-resolved characteristics of the free surface plasma jet generated by a PT operating in open air have been investigated. The temporal evolution of the PT-driven plasma was visualized by using an intensified CCD camera and plasma formation was correlated with the current behavior of the plasma jet. Notably, the plasma formation is a discrete process, appearing at a relatively fixed phase of the sinusoidal input, and the strongest plasma jet appears at the end of the positive half-cycle. Simultaneous measurements of the current show that the dis...

中文翻译：

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在压电晶体表面形成的自由等离子体射流的时间分辨特性

当压电变压器（PT）由低输入电压（〜10 V）致动时，机电耦合会在远端导致非常高的表面电势（〜10 3 V），从而使周围的气体电离并产生等离子体从表面喷出的水。PT由于操作简单，所需输入电压低且功耗低，因此对于非平衡等离子体的产生具有吸引力。在这项工作中，已经研究了由在露天工作的PT产生的自由表面等离子体射流的时间分辨特性。PT驱动的等离子体的时间演变通过使用增强型CCD摄像机可视化，并且等离子体的形成与等离子体射流的当前行为相关。值得注意的是，等离子体的形成是一个离散过程，出现在正弦波输入的相对固定的相位上，而最强的等离子流出现在正半周期的末尾。电流的同时测量表明...