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光学天线作为空间激光通信系统中的核心组件,应具有较好的温度场稳定性和均匀性。较大的天线口径和地球静止轨道空间外热流的复杂聚变,增大了天线温度场热控技术的难度。根据光学天线的构型特点和外热流的变化规律,基于光机热一体化协同设计,将空间高效热防护技术与光学镜面辅助热控技术相结合,实现了对大口径光通信天线温度场的稳定性与均匀性的长期精稳控制,并通过热实验进行验证。实验结果表明,强日照期对天线采取避光策略时,满足光通信天线温度场指标要求的时长大于14.3h/d,温度稳定控制在21.4~26.2℃范围内,主镜自身热差不大于1.3℃,主镜与次镜之间的热差不大于3.8℃,这些结果均高于稳定性与均匀性的指标要求。
As the core component of space laser communication system, optical antenna should have better stability and uniformity of temperature field. Larger antenna caliber and complex fusion of the heat flux outside the geostationary orbit space increase the difficulty of the thermal control technology of the antenna temperature field. According to the configuration characteristics of the optical antenna and the variation law of the external heat flow, based on the collaborative design of integrated thermal and optical engine, the space efficient thermal protection technology and the optical mirror-assisted thermal control technology are combined to realize the temperature field of the large aperture optical communication antenna Stability and uniformity of the long-term precision control, and verified by thermal experiments. The experimental results show that the time length of the optical communication antenna temperature field is longer than 14.3h / d and the temperature is stable within the range of 21.4 ~ 26.2 ℃, and the thermal difference of the main mirror is not more than 1.3 ℃, the thermal difference between the primary mirror and secondary mirror is not more than 3.8 ℃, these results are higher than the stability and uniformity of the index requirements.