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Fundamental Research on Surface Discharge Phenomena of Insulation Materials in space Environment

空间环境下绝缘材料表面放电现象的基础研究

基本信息

批准号：
01550214
负责人：
ISHII Masaru
金额：
$ 1.28万
依托单位：
Institute of Industrial Science, The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550214/
关键词：
Spacecraft Charging Electron Beam High-Vacuum Mass-Spectrum Analysis Spectroscopic Analysis 質量分折分光分折

项目摘要

Spacecraft charging is considered a major cause of malfunctions of spacecrafts on high altitude, such as geosynchronous satellites. An experimental study on the discharge phenomena on polymer films irradiated by an electron beam in a high-vacuum chamber, which simulates the spacecraft charging and discharging, has been performed.1. Major differences between the space environment and the high-vacuum chamber in a laboratory, which affect the spacecraft charging and discharging phenomena, are supposedly the temperature and the pressure of the residual gas. The temperature influences the conductivity of insulation materials. It dominates the charging phenomena, however, it is believed to be less influential on the discharge phenomena.2. The gas pressure realized in a laboratory is still considerably higher than the space environment at the altitude of the geosynchronous orbit. As a result of this research, the residual gas has been known to play an important role in the initiation of surfa … More ce discharges. As the conditioning effect is observed in both the condition of the initiation of surface discharge and the spectrum of discharge light, the arc discharge will be harder to occur in the space environment where residual gas molecules are much less. Smoothing the interface between the insulation materials and metallic surface will also help the discharge potential to rise.3. In spite of the above findings, discharges on spacecrafts on the geosynchronous orbit have been actually observed. This fact suggests that release of gas molecules absorbed in the insulation materials on the surface of spacecrafts may be an important factor in the discharge phenomena. Therefore, the simulation of the phenomena in a vacuum chamber is known to be useful in investigating the spacecraft charging and discharging.4. The molecules of residual gas also affect deterioration of some kind of insulation material associated with surface discharges, which is known by the mass-spectrum analysis of released gas. This fact has to be taken into account in the evaluation of spacecraft materials in a space chamber. Less

航天器充电被认为是导致地球同步卫星等高海拔航天器故障的主要原因。在模拟航天器充放电的高真空室中，对聚合物薄膜在电子束辐照下的放电现象进行了实验研究.空间环境与实验室高真空室之间影响航天器充放电现象的主要差异，据推测是残余气体的温度和压力。温度影响绝缘材料的导电性。它对充电现象起主导作用，但对放电现象的影响较小.在实验室中实现的气体压力仍然大大高于地球同步轨道高度处的空间环境。研究结果表明，残余气体在表面引发过程中起着重要作用， ...更多信息 CE放电。由于沿面放电起始条件和放电光谱均存在调理效应，在残余气体分子较少的空间环境中，电弧放电将更难发生，同时，平滑绝缘材料与金属表面的界面也有助于放电电位的提高.尽管有上述发现，地球同步轨道上的航天器上的放电还是被实际观察到了。这一事实表明，在航天器表面的绝缘材料中吸附的气体分子的释放可能是放电现象的一个重要因素。因此，模拟真空室中的充放电现象对于研究航天器充放电过程具有重要意义.残留气体的分子也影响与表面放电相关的某种绝缘材料的劣化，这通过释放气体的质谱分析而已知。在评价空间舱中的航天器材料时必须考虑到这一事实。少