Discharge expansion in barrier discharge arrangements at low applied voltages
Discharge expansion in barrier discharge arrangements at low applied voltages
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DOI：
10.1088/0963-0252/20/5/055015
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发表时间：
2011-10
影响因子：
3.8
通讯作者：
P. Reichen;A. Sonnenfeld;P. R. von Rohr
中科院分区：
文献类型：
--
作者：
P. Reichen;A. Sonnenfeld;P. R. von Rohr
本研究评估了大气压下屏障放电（bd）在氧气、二氧化碳、合成空气和氦中的空间膨胀。尽管被限制在狭窄的气体通道中，但实验观察到，在低施加电压下，BD等离子体仅部分覆盖了可用的放电区域。这对于均匀表面处理是很重要的。等离子体发育过程中局部放电区的出现导致等效电路的容性行为随外加电压的变化而变化。因此，在不同的放电区域和不同的气体成分下，研究了视介电容量的瞬态行为。此外，提出了描述膨胀行为的半经验模型，并通过得到的实验数据进行了验证。结果清楚地表明，与氦气相比，含氧气体需要三倍高的电压过剩才能产生充分的等离子体膨胀。对于考虑的放电区域，可用电极的尺寸在等离子体膨胀过程中起次要作用。
This study evaluates the spatial expansion of barrier discharges (BDs) in oxygen, carbon dioxide, synthetic air, and helium at atmospheric pressure. Despite being confined in narrow gas channels, the BD plasma only partially covers the available discharge area at low applied voltages as was experimentally observed. This is important for homogeneous surface treatment. The appearance of local discharge zones in the plasma development results in a variation of the capacitive behaviour of the equivalent electric circuit as a function of the applied voltage. This transient behaviour of the apparent dielectric capacitance is therefore investigated for various discharge areas and different gas compositions. Furthermore, a semi-empirical model describing the expansion behaviour is proposed and validated by means of the obtained experimental data. The results clearly show that a three times higher voltage excess is required for oxygen-containing gases compared with helium in order to develop full plasma expansion. For the discharge areas considered, the size of the available electrode plays a minor role in the plasma expansion process.