高分六号卫星甚宽视场相机的热控设计及验证  

Thermal control design and verification of extra-wide field-of-view camera for GF-6 satellite

作　　者：于善猛[1] 江帆[1] 杜春平 王航 关洪宇[1] 关奉伟[1] 刘巨[1] 王灵杰[1] Yu Shanmeng;Jiang Fan;Du Chunping;Wang Hang;Guan Hongyu;Guan Fengwei;Liu Ju;Wang Lingjie(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《红外与激光工程》2023年第11期310-312,313-319,共10页Infrared and Laser Engineering

基　　金：国家高技术研究发展计划项目(2016YFB0500100)。

摘　　要：甚宽视场相机作为高分六号卫星的核心载荷,具备65.6°视场、862 km超大幅宽和8谱段成像能力。针对其自由曲面离轴四反光学系统的结构特点和任务需求,采用复合型多层隔热组件进行热隔离、高导热率石墨膜进行热疏导及分级热控等措施进行了热控设计,实现了光机结构的精密控温和高热耗/热流密度电子学设备的高效散热,并利用有限元分析软件UG12.0/Space thermal仿真分析了相机高、低温工况下的温度;通过对比热分析、热试验及卫星在轨遥测温度数据,验证了该热控方案的实际效果。在轨遥测数据显示:光机结构在轨温度水平为19.7~20.3℃,温度梯度最大不超过0.4℃,CMOS焦面组件每轨摄像12 min的情况下,温度波动在19~24℃,均满足热控指标要求,遥测数据与热分析及热试验结果偏差小于±0.5℃。表明该相机热设计正确可行,热分析及热试验过程合理可靠。Objective The extra-wide field-of-view camera adopts an off-axis four-mirror optical system,and the second and forth mirror adopt an integrated free-form surface structure.A free-form surface is an asymmetric structure that is highly sensitive to thermal changes.Even with a uniform change in bulk temperature,the opticalmechanical structure still undergoes asymmetric geometric changes.In addition,the extra-wide field-of-view camera needs to meet the design requirements of a width of 860 km and a field of view of 65.6°,and the entrance mask adopts a wide special-shaped opening design.The sun shines directly on the inside of the hood for a duration of5.5 minutes as it enters and exits the Earth's shadow.Both optical and mechanical errors are caused by heat cause line of sight drift(LOS)and wavefront distortion(WFE)in the camera.These issues seriously affect the optical transfer function of the system.Considering its structural characteristics and the thermal control challenges brought about by the large change of heat flow outside the light entrance,targeted thermal control measures must be taken for different parts of the camera to meet the thermal control index requirements of off-axis free-form surface cameras with special-shaped optical apertures in orbit.Methods Six aspects of the camera are analyzed,including its on-orbit state,structural layout,task requirements,orbital environment,technical indicators,and heat sources.The thermal control design is implemented by using composite multi-layer heat insulation components for thermal isolation(Fig.7),graded thermal control for mirrors(Fig.8),and high thermal conductivity graphite film for thermal conduction(Fig.9).This design allows for precise control of the optical-mechanical structure and efficient heat dissipation of high heat consumption/heat flux electronic equipment.The temperature of the camera is simulated and analyzed under high and low temperature conditions using the finite element analysis software UG12.0/Space thermal.The effectiveness of the therma

关 键 词：热控设计 甚宽视场相机 热平衡试验 在轨验证 

分 类 号：V448.25[航空宇航科学与技术—飞行器设计]