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空间电场探测球形传感器是利用卫星平台在空间耦合等离子体电势的敏感部件。球形传感器通常采用加工性能良好、质轻的铝合金材料,表面涂覆导电涂层。而涂层的光电特性会影响电场的测量精度。本文对涂层光电特性对光电子流的影响、对接触电势的影响两个方面进行了理论分析;并就传感器材料铝合金2A12基底、涂层环氧掺碳材料DAG213为研究对象,测量并研究了可表征其光电特性的功函数及其变化;研究结果表明,DAG213涂层表面功函数较铝合金基底有不少于1eV的提升,且标准差有不少于0 eV的降低,说明DAG213涂层的功函数更为均匀,更有利于提高传感器在空间的电场测量精度。
Spatial Electric Field Detection Sphere sensors are sensitive components that use the satellite platform to couple the plasma potential in space. Ball sensors are usually processed with good performance, light aluminum alloy material, the surface coating conductive coating. The photoelectric properties of the coating will affect the measurement accuracy of the electric field. In this paper, the influence of the photoelectric properties of the coating on the photoelectron flow and the influence of the contact potential are analyzed theoretically. And the aluminum alloy 2A12 sensor substrate and the coating epoxy DAG213 as the coating material are measured and studied The results show that the surface work function of DAG213 coating is not less than 1eV than the aluminum alloy substrate, and the standard deviation is not less than 0 eV, indicating that the DAG213 coating The work function is more uniform, more conducive to improve the sensor in the electric field measurement accuracy.