Two-dimensional electron density measurement of pulsed positive secondary streamer discharge in atmospheric-pressure air
Two-dimensional electron density measurement of pulsed positive secondary streamer discharge in atmospheric-pressure air
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DOI：
10.1088/1361-6463/ab0725
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发表时间：
2019-03
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影响因子：
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通讯作者：
Y. Inada;A. Komuro;R. Ono;A. Kumada;K. Hidaka;M. Maeyama
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文献类型：
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作者：
Y. Inada;A. Komuro;R. Ono;A. Kumada;K. Hidaka;M. Maeyama
使用时间分辨率为 5 ns 的高灵敏度 Talbot 型激光波前传感器，对在大气压下安装在空气中的 13 mm 针板间隙中产生的脉冲正二次流束上的二维电子密度分布进行单次可视化。单次成像表明，主流光通道中的电子密度在通过次流光前沿后增加。传播的次级流注内部的电子密度显示出几乎均匀的轴向分布，并且在大约 40 ns 内保持大约恒定在 0.7– cm−3。这种暂时稳定的电子密度表明，在传播过程中，次级流注内部的电场减小约为 110-120 Td。在第二流光阶段结束时，电子密度以~10 ns的时间常数下降。
Highly sensitive Talbot-type laser wavefront sensors with a temporal resolution of 5 ns were used for the single-shot visualisation of two-dimensional electron density distributions over pulsed positive secondary streamers generated in a 13 mm pin-to-plate gap installed in air under atmospheric pressure. The single-shot imaging demonstrated that the electron density in the primary streamer channel increased after passage of the secondary streamer front. The electron density inside the propagating secondary streamer showed almost uniform axial distribution and it kept approximately constant at 0.7– cm−3 for about 40 ns. This temporally stable electron density suggested that the reduced electric field inside the secondary streamer was approximately 110–120 Td during the propagation. In the end of the secondary streamer phase, the electron density decreased at a time constant of ∼10 ns.