空气针尖负电晕放电的特征辐射谱

Electromagnetic Radiation from Negative Corona Discharge in Air

为得到针尖负电晕放电的辐射特征,采用针-环结构对不同空气条件下负电晕放电的辐射谱进行了实验测试。结果表明,在给定电极件下,空气负电晕放电具有一定的特征辐射谱,频率<100MHz。这种特征辐射谱的位置不随放电电压(电流)和气体等条件变化;特征辐射强度与放电电压无关,但与空气的气压和气流有关。空气负电晕放电的特征辐射与Trichel脉冲的形成过程相关,电流脉冲的上升沿决定特征频谱的位置和幅度。

In order to obtain spectra of electromagnetic （EM） radiations from the negative corona discharge in air, the radiation field was measured in a needle to-ring configuration under different gas conditions. The experiments show that some characteristic EM radiations emit from the negative corona whose frequency is of tens megahertz. The characteristic radiations have fixed position and amplitude on the spectrum meter which does not depend on the applied voltage or the discharge current under given gas conditions. These radiations do not change their characteristic spectra when the gas condition changes, but have different amplitudes in various air pressures or air{lows. The characteristic EM radiations of the negative corona discharge in air are supposed to relate to the Trichel pulse. The rising edge of the pulsed current determines the frequency as well as the amplitude of the EM radiations.