Trichel Pulse in Negative DC Corona discharge and Its Electromagnetic Radiations

Abstract

-We investigate in this paper the radiated electromagnetic waves together with the discharge characteristics of Trichel pulse of negative DC corona discharge in air in pin-to-plate and wire-to-plate configurations. The feature of the current pulse and the frequency spectrum of the electromagnetic radiations were measured under various pressures and gas gaps. The results show that the repetition frequency and the amplitude of Trichel pulse current depend on the discharge conditions, but the rising time of the pulse relates only to the radius of needle or wire and keeps constant even if the other conditions (including the discharge current, the gas gap and the gas pressure) change. There exists the characterized spectrum of electromagnetic waves from negative corona discharge in Trichel pulse regime. These characterized radiations do not change their frequency at a given cathode geometry even if the averaged current, the gas gap or the air pressure changes, but the amplitude of radiations changes accordingly. The characterized electromagnetic radiations from Trichel pulse corona relate to the formation or the rising edge of current pulse. It confirms that the characterized radiations from Trichel pulse supply information of discharge system and provide a potential method for detecting charged targets.

Pulse Current of Multi-Needle Negative Corona Discharge and Its Electromagnetic Radiation Characteristics

“…Document [21] has studied the effect of Trichel pulse current parameters on the discharge radiation spectrum. This paper mainly analyzes the relationship between the amplitude of discharge EM radiation field and Trichel pulse parameters.…”

“…Based on the study of EM radiation characteristics of single-needle negative corona discharge by Zhang Y. [21], we studied the pulse current and its EM radiation characteristics of multi-needle negative corona. Different from Abdel-Salam's [8,22] research on the volt-ampere characteristics of multi-needle negative corona discharge, we analyzed the pulse current characteristics of the negative corona discharge and studied the corresponding relationship between EM radiation signal and pulse current.…”

“…Zhang Y. [21] studied the relationship between the spectrum of the single-needle negative corona radiation signal and the discharge parameters. He believed that the spectrum of the discharge EM radiation signal is only related to the rising time of the Trichel pulse current.…”

Pulse Current of Multi-Needle Negative Corona Discharge and Its Electromagnetic Radiation Characteristics

“…Document [18] has studied the effect of Trichel pulse current parameters on the discharge radiation spectrum.This paper mainly analyzes the relationship between the amplitude of discharge EM radiation field and Trichel pulse parameters. When the single Trichel pulse current waveform is the same, as the pulse repetition frequency increases, the average power of the radiation signal will increase, but the repetition frequency of the pulse will not affect the EM radiation signal generated by each pulse current, which is consistent with the experimental results ( Figure 5).…”

“…Although they obtained the spectrum of the negative corona radiation signal, they did not analyze the mechanism of the radiation signal. Zhang Yu [18] et al studied the relationship between the spectrum of the single-needle negative corona radiation signal and the discharge parameters and believed that the spectrum of the discharge EM radiation signal is only related to the rising time of the Trichel In this paper, the current characteristics of multi-needle negative corona discharge and its EM radiation characteristics were studied. A test system for negative corona discharge radiation characteristic was set up.…”