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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Sub-nanosecond resolution electric field measurements during ns pulse breakdown in ambient air
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Sub-nanosecond resolution electric field measurements during ns pulse breakdown in ambient air

机译：在环境空气中NS脉冲击穿期间的亚纳秒分辨率电场测量

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摘要

Electric field during ns pulse discharge breakdown in ambient air has been measured by ps four-wave mixing, with temporal resolution of 0.2 ns. The measurements have been performed in a diffuse plasma generated in a dielectric barrier discharge, in plane-to-plane geometry. Absolute calibration of the electric field in the plasma is provided by the Laplacian field measured before breakdown. Sub-nanosecond time resolution is obtained by using a 150 ps duration laser pulse, as well as by monitoring the timing of individual laser shots relative to the voltage pulse, and post-processing four-wave mixing signal waveforms saved for each laser shot, placing them in the appropriate 'time bins'. The experimental data are compared with the analytic solution for time-resolved electric field in the plasma during pulse breakdown, showing good agreement on ns time scale. Qualitative interpretation of the data illustrates the effects of charge separation, charge accumulation/neutralization on the dielectric surfaces, electron attachment, and secondary breakdown. Comparison of the present data with more advanced kinetic modeling is expected to provide additional quantitative insight into air plasma kinetics on similar to 0.1-100 ns scales.
机译：NS脉冲放电期间的电场通过PS四波混合测量环境空气中的击穿，时间分辨率为0.2ns。在平面到平面几何形状中，已经在介电阻挡放电中产生的漫反射等离子体中进行了测量。拉普拉斯场在击穿前测量的拉普拉斯场提供等离子体中电场的绝对校准。通过使用150ps持续时间激光脉冲来获得亚纳秒时间分辨率，以及通过监视相对于电压脉冲的各个激光镜头的定时，并为每个激光射击保存的后处理四波混合信号波形，放置他们在适当的“时间箱”中。将实验数据与脉冲击穿期间等离子体中的时间分辨电场的分析解决方案进行比较，显示了NS时间尺度的良好一致性。对数据的定性解释说明了电荷分离，电荷累积/中和对介电表面，电子附件和二次击穿的影响。预计具有更先进的动力学建模的本数据的比较预计将为类似于0.1-100ns秤的空气等离子体动力学提供额外的定量洞察。

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