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为了研究航天器介质材料表面不同电位初始值对表面电位衰减特性的影响。利用航天器带电地面模拟实验设备对聚酰亚胺和聚四氟乙烯介质材料充电到不同电位值,然后关闭电子枪,用电位计测量介质材料表面电位的衰减曲线,并从理论上对cross-over现象进行分析。介质材料初始电位值越大,则表面电位衰减速度越快,且在一定的时间段内电位衰减效率随初始电位值的增大而变大;在相同的真空度条件下,对于初始电位值之和相等的两组衰减曲线,初始电位值之间差值较小的一组衰减曲线更容易出现cross-over现象;出现cross-over现象的时间和电子的迁移率相关,对于相同的两个初始电位,迁移率越大的材料则出现cross-over现象的时间越短,电位衰减会更快。航天器介质材料表面充电电位越大则衰减速度越快,在一定时间的衰减效率越高。
In order to study the influence of the initial values of different potential on the surface of dielectric materials on the surface potential decay characteristics. Polyimide and polytetrafluoroethylene dielectric materials were charged to different potential values by using spacecraft charged ground simulation equipment, then the electron gun was closed, the decay curve of the surface potential of the dielectric material was measured by a potentiometer, and the cross- over phenomenon analysis. The higher the initial potential of the dielectric material, the faster the surface potential decays, and the efficiency of the potential decay increases with the increase of the initial potential in a certain period of time. Under the same degree of vacuum, And an equal two sets of decay curves, a set of decay curves with a smaller difference between the initial potential values is more likely to cross-over; the time at which the cross-over phenomenon occurs is related to the mobility of electrons and for the same two initial Potentials and materials with higher mobility exhibit shorter cross-over times and faster potential decay. The higher the surface charge potential of the spacecraft dielectric material, the faster the decay rate and the higher the decay efficiency at a certain time.