High-potential current acquisition system suitable for 10cm-2m gap discharge process

Abstract

The invention discloses a high-potential current acquisition system suitable for a 10cm-2m gap discharge process, and belongs to the field of current measurement. The input end of a current injection path is connected with a high-voltage electrode, and the output end is connected with a sampling resistor; the resistance value R of the sampling resistor satisfies 10 omega < = R < = 400 omega, and the other end of the sampling resistor is in equipotential connection with the shielding case and is used for receiving a discharge current signal of the high-voltage electrode; the signal attenuator is adjustable, the attenuation range is 3-30 dB, and the signal attenuator is connected with the sampling resistor in parallel and used for attenuating the obtained voltage signal to the adjusted attenuation multiplying power; the bandwidth of the voltage follower is not less than 150MHz, the input end of the voltage follower is connected with the output end of the signal attenuator, the output end of the voltage follower is connected with the input end of the high-speed light emitter, and the voltage follower is used for providing a voltage input signal required by the high-speed light emitter; the bandwidth of the high-speed light emitter is higher than that of the voltage follower, and the output end of the high-speed light emitter is connected with the transmission optical fiber and used for directly converting the analog electric signals after voltage following into optical signals. According to the invention, cross-scale high-precision current acquisition and measurement are realized.

Description

technical field [0001] The invention belongs to the field of current measurement, and more particularly, relates to a high-potential current acquisition system suitable for a 10cm-2m gap discharge process. Background technique [0002] Rod-to-plate gap discharge is a strong ionization phenomenon in which a current flows if a voltage is applied to the upper two electrodes. In order to deeply study the physical mechanism of gap discharge, it is necessary to measure the current parameters generated during the discharge process, especially the discharge current generated by the high voltage terminal. The current bandwidth of this type is usually as high as tens of MHz, and the wavefront time is as low as tens of nanoseconds. Therefore, the bandwidth and sensitivity performance of the current acquisition system are required to meet the measurement requirements. In addition, for the measurement of the high-voltage side current, it is also necessary to solve the problem of electri...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects and improvement requirements that the existing current acquisition is only suitable for 1m-2m long gap discharge, or only suitable for short gap discharge, and cannot be applied to cross-scale gap discharge at the same time, the present invention provides a method suitable for 10cm-2m gap discharge The high-potential current acquisition system during the discharge process aims to realize cross-scale and high-precision current acquisition and measurement in long and short gaps

Images