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光学天线是空间激光通信的核心组件,对温度场的稳定性和均匀性要求甚高,天线口径大及地球静止轨道(GEO)空间外热流复杂聚变,增大了天线温度场热控技术的挑战性。针对光学天线构型特点和外热流变化规律,基于光、机、热一体化协同设计基础,采取空间高效热防护技术与光学镜面辅助温控结合的技术途径,实现了大口径光通信天线温度场的稳定性与均匀性长期精稳控制,并通过热试验验证。试验结果表明,强日照期采取避光策略情况下,满足光通信天线温度场指标要求的时长大于14.3h/天,温度场分布稳定控制在21.4℃~26.2℃,主镜热差≤1.3℃,主镜与次镜之间热差≤3.8℃,优于稳定性与均匀性指标要求。
Optical antennas are the core components of space laser communication. They require high stability and uniformity of the temperature field, large aperture of the antenna and complicated fusion of heat flux outside the GEO space, which increases the challenge of the thermal control technology of the antenna temperature field Sex. Aiming at the characteristics of optical antenna configuration and the change rule of external heat flow, based on the synergetic design basis of light, machine and heat, the technology of space-efficient thermal protection technology combined with optical mirror-assisted temperature control is adopted to realize the large aperture optical communication antenna temperature field Stability and uniformity of the long-term precision control, and verified by thermal test. The experimental results show that the time length longer than 14.3h / day, the temperature field distribution stable controlled at 21.4 ℃ ~ 26.2 ℃, the main mirror thermal difference ≤1.3 ℃, The main mirror and the second mirror thermal difference ≤ 3.8 ℃, better than the stability and uniformity requirements.