The Potential Measurement Technology In Ground Testing For Spacecraft Dielectric Charging Effect And Its Application

The space radiation environment is complex,and charging and discharging effect is one of the important environmental effects which threaten spacecrafts’ security.Discharge can not only causes damage to spacecraft dielectric itself, but also affects its insulation performance. The ESD(Electro-Static Discharge) pulse will interfere with the normal work of spacecraft system, and seriously the spacecraft can be broken down. Ground testing is an effective method for studying the charging and discharging effect, of which the charging potential is the main parameter. Therefore,accurately measurement of the charging potential is of great significance.A non-contact transfer measurement method is presented with analyses of the influencing factors to the measurement errors and the methods for improving the transfer measurement resolution, and thus a non-contact measurement system with transfer mechanism is designed. The validation test results show that the resolution of dielectric charging voltage is less than 10 V, and the error caused by the charge leakage is very small. The system can meet requirements of spacecraft dielectric charging potential measurement.This thesis chose the epoxy and polyimide which commonly used on spacecraft dielectric materials, and explored the influence factors of charge storage attenuation method using the non-contact transfer measurement system designed by the author.Test results show that the measurement results are almost the same using the same radiation sources and different initial potentials or using different irradiation sources and similar initial potentials. This shows that we can ignore the influence of different irradiation sources(radioactive source and electron gun) and different initial potentials when using the charge storage attenuation method.