高能电子辐照后高聚物内部空间电荷和介电性能研究

电介质材料被广泛地应用到各种辐射环境下,当它们受到高能电子辐射时,不仅会在其内部和表面积累电荷并引起放电现象,而且辐射会导致介质的物理和化学结构发生不可逆变化.本文采用自行研制的可用以在真空电子束辐射环境下进行空间电荷测量的脉冲电声法测量系统,离线测量并分析了在大气环境下,经不同能量高能电子束辐照后几种介质材料内部空间电荷分布规律,对其辐照后的介电常数和损耗特性进行了实验研究.

Study on space charge and dielectric character of dielectric after high energy electron radiation

Dielectric materials are widely on used in various radiating environment. When they are radiated,not only the charge will cumulate inside and on the surface of the material,leading a pulse discharge phenomenon,but also a permanent change on physical and chemical structure of the material is happened.Therefore,before any kind of dielectric is used into spacecraft,the charge character and degradation of the raw material in space radiation environment must be researched.In this paper,a special mesh electrode system that can be used to measure space charge of the material in vacuum and high-energy electron beam radiation situation by PEA(pulse electro-acoustic method) is designed.The space charge distribution within several dielectric materials is researched and some changes of dielectric character are studied after they have been radiated by high-energy electron beam.