Park Jin, Cha Min Suk
CERP, Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia.
Sci Rep. 2025 Mar 17;15(1):9127. doi: 10.1038/s41598-025-93958-7.
We investigated the dynamic interactions between electric fields and space charges within an axisymmetric dielectric barrier discharge (DBD) configuration. Employing a square-wave AC, the DBD setup ensured spatial and temporal consistency in microdischarge occurrences. The Electric Field Induced Second Harmonic Generation (EFISH) technique was utilized to capture electric fields and space charge distributions, with special emphasis on the theoretical deduction of space charges from Gauss's Law. After a microdischarge occurred, the measured electric fields diminished due to the destructive superposition of external electric fields and the fields induced by space charges. This reduction in electric field intensity prevented subsequent microdischarges from occurring. However, when the polarity changed, our results demonstrated an increase in the electric fields due to constructive reinforcement between the external electric fields and the space-charge-induced electric field. This enhancement in the electric field facilitated the occurrence of subsequent microdischarges. Notably, a dominant excess of negative charges was observed in the negative phase after the microdischarge, indicating a net negative-charge domain likely due to electron emission from a metallic electrode. This study confirmed the effectiveness of the proposed method for estimating space charges by showcasing the inherent operating mechanism of DBD.
我们研究了轴对称介质阻挡放电（DBD）结构中电场与空间电荷之间的动态相互作用。采用方波交流电，DBD装置确保了微放电发生在空间和时间上的一致性。利用电场诱导二次谐波产生（EFISH）技术来获取电场和空间电荷分布，特别强调了根据高斯定律对空间电荷进行理论推导。微放电发生后，由于外部电场与空间电荷所感应电场的相消叠加，测量到的电场减弱。电场强度的这种降低阻止了后续微放电的发生。然而，当极性改变时，我们的结果表明，由于外部电场与空间电荷感应电场之间的相长叠加，电场增强。电场的这种增强促进了后续微放电的发生。值得注意的是，在微放电后的负相中观察到大量占主导的负电荷，这表明可能由于金属电极发射电子而形成了一个净负电荷区域。本研究通过展示DBD的固有运行机制，证实了所提出的估算空间电荷方法的有效性。
