Experimental investigation of single microdischarges in a barrier corona arrangement with a cathodic metal pin
Experimental investigation of single microdischarges in a barrier corona arrangement with a cathodic metal pin
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DOI：
10.1088/1361-6595/ab52e9
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发表时间：
2020-03
影响因子：
3.8
通讯作者：
S. Jahanbakhsh;V. Brüser;R. Brandenburg
中科院分区：
文献类型：
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作者：
S. Jahanbakhsh;V. Brüser;R. Brandenburg
采用时间相关单光子计数（TC-SPC）技术、电测量（外加电压和电流脉冲）和ICCD图像研究了大气压下干空气中正弦驱动阻挡电晕放电中的微放电（MD）。在当前的贡献，结果的阴极针半周期。阳极针半周期的结果见先前的研究（Jahanbakhsh等人，2018年，Plasma Sources Sci. Technol.27115011）。在阴极针半周期出现阶段，MD的电流脉冲幅度具有不稳定的行为。因此，当前的脉冲幅度进行统计研究，它是相关的相位分辨的时空发展的MD，从TC-SPC记录。这项研究表明，MDs的击穿和发展取决于它们的起始阶段，这与先前（阳极引脚）半周期的放电活动有关。它示出，出现在较低的施加电压的MDs点燃与阳极（电介质）附近的正流光开始，类似于单介质阻挡放电MDs。另一方面，在较高的施加电压出现的MD的开始发生与双流光机制开始附近的阴极（针）的尖端。这些MD与瞬态火花具有相似性，特别是与单个DBD相比高得多的电流脉冲幅度。
Microdischarges (MDs) in a sinusoidally driven barrier corona discharge, operated in dry air at atmospheric pressure, are investigated using time-correlated single photon counting (TC-SPC) technique, electrical measurements (applied voltage and current pulses) and ICCD images. In the current contribution, results of the cathodic pin half-cycle are presented. Results of the anodic pin half-cycle were presented in a previous study (Jahanbakhsh et al 2018 Plasma Sources Sci. Technol. 27 115011). In the cathodic pin half-cycle appearance phase and current pulse amplitude of the MDs have an erratic behavior. Hence, a statistical study of the current pulse amplitudes is conducted, and it is correlated to the phase-resolved spatio-temporal development of the MDs, obtained from TC-SPC recordings. This study indicates that the breakdown and development of the MDs is dependent on their inception phase, which is related to the discharge activity in preceding (anodic pin) half-cycles. It is shown that the MDs appearing at lower applied voltages are ignited with a positive streamer starting near the anode (dielectric), similar to single dielectric barrier discharge MDs. On the other hand, the inception of the MDs appearing at higher applied voltages takes place with a double-streamer mechanism starting near the tip of the cathode (pin). These MDs have similarities to transient sparks, in particular much higher current pulse amplitudes compared to single DBDs.