摘要
表面充电是最早被人们发现的空间环境效应,是由空间环境引起的航天器异常和故障的主要诱因之一.采用较精确的金属二次电子发射公式和局部电流平衡模型,在无光照的情况下,对不同表面材料及不同几何形体的航天器表面充电电位进行计算,并绘制了表面材料的充电电位与最大二次电子发射系数之间的关系曲线.根据数值计算结果及次级电子发射系数和曲线图得知,航天器阴面充电电位与表面材料的原子序数、最大二次电子发射系数和入射离子引起的次级发射系数均有关.该计算对航天器表面材料的选取和设计工艺有一定的参考价值.
Surface charging is a space environment effect. It is one of the major incentives for spacecraft anomalies and failures, which is caused by the space environment. By using more accurate universal formulas for the secondary electron yield from metals and the local current balance model, the charging potentials of shaded-surfaces of a spacecraft are calculated for different surface materials and shapes in MATLAB. According to the results, we draw several curves of the charging potentials and the maximum secondary electron yield. Based on the numerical results, the secondary electron yield and the curves, it can be concluded that spacecraft surface charging have a great relationship with the maximum secondary electron yield, atomic number and the secondary electron yield caused by incident ions. These give certain reference value for the selection and design technique of surface materials.
出处
《空间科学学报》
CAS
CSCD
北大核心
2012年第6期862-868,共7页
Chinese Journal of Space Science
基金
南京信息工程大学科研基金项目资助(S8108197001)
关键词
次级发射系数
航天器表面充电局部电流平衡模型
Secondary electron yield, Spacecraft surface charging, Local current balance model
