Sensitive measurements of very weak electrical currents in sinusoidally driven surface barrier discharge in atmospheric air are reported for discharge arrangements with and without liquid covering the top electrode. The transferred charge of the low-power discharge is carefully quantified and it is shown that after the complete voltage period the total charge balance is approaching zero. This rather obvious result is mechanically assumed in the literature, yet it is experimentally not understood in detail. We show that continuous and pulsed micro-ampere currents measured during the negative polarity are responsible for the gradual renewal of the charge transfer equilibrium abruptly distorted by strong electrical pulses caused by positive streamers during the opposite half-period. Using synchronised ICCD imaging we reveal that weak continuous current is caused by slowly expanding surface discharges stemming from previously established cathode spots. The expansion is caused by a s...

中文翻译：

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表面势垒放电中的电荷转移平衡：连续电流和负离子驱动的电离波

据报道，对于有或没有液体覆盖顶部电极的放电装置，在大气中以正弦驱动的表面势垒放电中非常弱的电流的灵敏测量结果。仔细量化了低功率放电的转移电荷，结果表明，在整个电压周期后，总电荷平衡接近于零。该相当明显的结果在文献中被机械地假定，但是在实验上没有被详细地理解。我们表明，在负极性期间测得的连续和脉冲微安电流是电荷转移平衡的逐步更新的原因，电荷转移平衡的逐渐更新是由正流注在相反的半周期引起的强电脉冲突然扭曲的。使用同步ICCD成像，我们发现弱连续电流是由先前建立的阴极斑点引起的表面放电缓慢扩展引起的。扩展是由...引起的