张衡一号空间电场探测仪设计  

Design Optimization of Zhangheng-1 Space Electric Field Detector

作　　者：马勉军[1] 雷军刚[1] 李诚[1] 李世勋[1] 宗朝[1] 刘泽[1] 崔阳[1] Ma Mianjun;Lei Jungang;Li Cheng;Zong Chao;Li Shixun;Liu Ze;Cui Yang(Lanzhou Institute of Physics,Lanzhou 730000,Chin)

机构地区：[1]兰州空间技术物理研究所,兰州730000

出　　处：《真空科学与技术学报》2018年第7期582-589,共8页Chinese Journal of Vacuum Science and Technology

摘　　要：张衡一号空间电场探测仪为我国首发电磁监测试验卫星(CSES)主载荷。基于探测原理以及与轨道等离子体环境电势耦合模型,论述了张衡一号双探针式空间电场探测仪设计基本原则和依据;针对不同的轨道等离子体环境条件和鞘层厚度,阐述了相应的球形探针收集电流、相对耦合电势及鞘层阻抗的数学表达,分析了该探测仪电场探测精度的影响因素以及主动偏置电流效应,研究表明,对于CSES飞行轨道环境条件,采用施加负向偏置电流,可使得探针鞘层阻抗小于1×105Ω,从而提高空间电场探测精度;研究了张衡一号空间电场探测仪探针间耦合电势差测量等效电路模型和球形探针最小几何半径设计约束条件,结果表明,对于CSES飞行轨道通常等离子体环境条件,当球形探针几何半径r3×10-2m时,可实现两球形探针电势差测量偏差系数α!10-6的设计要求。在以上基础上,叙述了张衡一号空间电场探测仪球形探针结构与电子学设计,并简述了探测系统主要组成、工作模式和频段等。Zhangheng-1 space electric field detector with double spherical probes,as the main payload of China＇s 1 stSeismo-Electromagnetic Satellite（ CSES）,was designed and tested via ground simulation. The influence of the negative bias-current on the field detection accuracy,in different orbit plasma environments and with different sheath thicknesses,was mathematically formulated with the potential coupling model,theoretically analyzed and experimentally evaluated. The results show that the bias-current significantly increases the detection precision because of a decrease of the impedance of the probe＇s plasma sheath to below1 × 10^5Ω. The dependence of the measured coupling potential difference between the double probes on the spherical radius was also investigated. We found that a radius greater than 3 × 10^-2 m resulted in the deviation coefficient α ≤10-6 in the measurement. In addition,the structure,circuitry,working mode and frequency range of the novel detector was tentatively discussed.

关 键 词：张衡一号 空间电场 探针 耦合电势 鞘层阻抗 设计 

分 类 号：V419.7[航空宇航科学与技术—航空宇航推进理论与工程]