航天用FR4 材料的本征电导率测试

介质材料电导率是影响卫星充电过程的重要材料参数,它决定着航天器上电荷的分布状态以及电流平 衡建立的快慢。常规的电导率测量方法完全不考虑空间真实带电环境,其测试结果用于卫星带电防护设计将会产生 较大的误差。本文建立了用传统三电极法和电荷衰减法测试介质材料本征电导率的测试系统,对卫星常用的FR4 材 料进行了测试,测试结果与国外的结果相近。

Evaluation of Dark Conductivity of FR4 Printed Circuit Board Used for Spacecrafts

Conductivity of insulating materials is a key parameter to determine how accumulated charge will distribute across the spacecraft and how rapidly charge imbalance will dissipate. However, methods are often not applicable to situations encountered in spacecraft charging, conductivity is more appropriately measured for spacecraft charging applications as the decay of charge deposited on the surface of an insulator. These parameters determined from classical methods were used in design techniques to mitigating spacecraft charging effects may produce remarkable error. In this paper instrumentation for both classical and charge storage decay methods has been developed. Experiments were conducted by both methods on R4 Printed Circuit Board. The experiments are similar to results from Jet Propulsion Laboratory and Utah State University.