Measurement And Waveform Reconstruction Of Nanosecond Pulse Signal

Pulse power with fast rise time technology was applied in many fields such as nuclear physics, electron beam, accelerator, laser, HPM etc. The study of the insulation breakdown property under the nanosecond pulse is important to the design of the compact pulse power equipment, the key of this study is the measurement to the current and voltage of the narrow wide pulse with high magnitude against the intensive noise. The measurement system together with the electrical signal voltage and current sensors with electromagnetic compatibility was set up based on the analysis of the measurement system. The conception and algorithm for waveform reconstruction in time series was brought up.The voltage sensor with fast response time is the capacitive divider designed into the geometry of the system which has little interference to the measurement system. The Rogowski coil ranged in the same axis was used as current sensor, in which the self-integral resistance should has smaller inductance and smaller capacitance as possible. The suitable parameter can lead to satisfied waveform.The methods to reduce the noise was took out after analyzing the interfere source. Shunning steps of the section in the transmission line is needed to avoid the echo and attenuation of the wave. The time-frequency analysis of the voltage and current signal is an important content also, which is helpful to illuminate the system from another aspect.The signal distortion waveform measured is inevitable due to the impact of the integrator in the voltage measurement system and the self-integral resistance in the current measurement system. In order to reflecting the original waveform from the distortion waveform, it is necessary to reconstruct the waveform through the statistical model identification against the noise circumstance and the inner parameter resonance. The measurement system is viewed as black box, the parameter of which was identified. It is successful to forecast and reconstruct the nanosecond pulse signal waveform. The agreement of theoretical analysis and experiment results shows that this innovation is widely suitable in the fast pulse signal measurement field.