Characteristics of DC Microdischarge Under Low Pressure

Qing Xiong, S. Ji, Lingyu Zhu, Weifeng Lu, Shiying Chen
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Abstract

DC microdischarge sometimes occurs in aeronautic or space equipment, which put serious threat to the safety of the devices because it has no zero current point. Aeronautic and space equipment is subjected to low pressure or even vacuum. Therefore, it is of great significance to investigate the characteristics of DC microdischarge under low pressure. A test platform of DC microdischarge was built. The DC microdischarge generation setup was put in a vacuum chamber, and the pressure varied from 0.6 kPa to 96 kPa. The current and electromagnetic radiation signals when DC microdischarge occurred were measured by Hall current sensor and Hilbert curve fractal antenna, respectively. The influences of materials, shape and moving velocity of electrode, and pressure were investigated. FFT was applied to analyze the characteristic frequency of the electromagnetic radiation signals. And the characteristic parameters were extracted. When microdischarge generates, the current has high frequency pulses superimposed on the DC current. The fast change of current results in the electromagnetic radiation. The experimental results indicate that the amplitude of the electromagnetic radiation generated by microdischarge varies with the influential parameters. With the decrease of pressure, the amplitude of electromagnetic radiation pulse of DC microdischarge generated by brass, copper and aluminum shows a descending trend, while the change of stainless steel is not obvious. However, the electromagnetic radiation pulse of DC microdischarge has a characteristic frequency range (36–41 MHz), and is independent from pressure, electrode materials, shape and moving velocity.
低压下直流微放电特性研究
航空航天设备中有时会出现直流微放电现象,由于直流微放电没有零电流点,对设备的安全构成严重威胁。航空和航天设备处于低压甚至真空状态。因此,研究低压下直流微放电特性具有重要意义。搭建了直流微放电试验平台。将直流微放电产生装置置于真空室中,压力在0.6 ~ 96 kPa之间变化。采用霍尔电流传感器和希尔伯特曲线分形天线分别测量直流微放电时的电流和电磁辐射信号。考察了电极材料、电极形状、电极运动速度、压力等因素的影响。利用FFT对电磁辐射信号的特征频率进行分析。并提取了特征参数。当微放电产生时,电流在直流电流上叠加高频脉冲。电流的快速变化导致了电磁辐射。实验结果表明,微放电产生的电磁辐射幅值随影响参数的变化而变化。随着压力的降低,黄铜、铜和铝产生的直流微放电电磁辐射脉冲幅值呈下降趋势,而不锈钢的变化不明显。而直流微放电电磁辐射脉冲的特征频率范围为36-41 MHz,且与压力、电极材料、形状和移动速度无关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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