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Vanadium Dioxide-Based Variable Reflectivity Radiation Coatings for Optical Propulsion Applications

机译：用于光推进应用的基于二氧化钒的可变反射率辐射涂层

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A dynamic radiation coating design is investigated which can actively control the reflectivity of spacecraft exterior surfaces to modulate incident solar radiation pressure for use in propulsion and attitude control applications. Vanadium dioxide (VO_2), an insulator-to-metal transition material which undergoes a dramatic shift in optical properties during phase transition, is employed as both the spacer and antireflection coating of a Fabry-Perot cavity to provide temperature or electrically modulated radiation pressure. The top and bottom mirrors of the Fabry-Perot resonator are gold and tungsten respectively. When the VO_2 is dielectric at temperatures below 341 K, the visible reflectance is reduced to less than 20% due to a Fabry-Perot absorption enhancement. At temperatures above 345 K, the combined thickness of the VO_2 and tungsten layers leads to 85% reflectance for the visible and near-infrared spectrum. This behaviour is found to be consistent for incidence angles up to 60 degrees. The corresponding solar radiation pressure modulation is 1.8 μN/m~2.
机译：研究了一种动态辐射涂层设计，该设计可以主动控制航天器外表面的反射率，以调制入射太阳辐射压力，以用于推进和姿态控制应用。二氧化钒（VO_2）是一种从绝缘体过渡到金属的过渡材料，在相变过程中其光学性能会发生剧烈变化，同时用作Fabry-Perot腔体的隔离层和抗反射涂层，以提供温度或电调制的辐射压力。法布里-珀罗谐振器的顶部和底部反射镜分别是金和钨。当VO_2在低于341 K的温度下为电介质时，由于法布里-珀罗（Fabry-Perot）吸收增强，可见反射率降低至小于20％。在高于345 K的温度下，VO_2和钨层的总厚度导致可见光谱和近红外光谱的反射率为85％。发现该行为对于高达60度的入射角是一致的。相应的太阳辐射压力调制为1.8μN/ m〜2。

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