石墨膜导热带在空间遥感器低温光学上的应用

Application of Heat Conduction Band of Graphite Film in Low Temperature Optics of Space Remote Sensor

为了确保某空间遥感器低温光学系统的正常工作,降低前端透镜温度以减小各透镜间的温差,需要通过高导热产品将其热量传递到低温冷源上。目前,传统的导热产品,包括槽道热管或铜质导热索等,受限于刚性或导热性的影响,无法满足前端透镜降温需求。为此,提出了采用柔性石墨膜导热带对前端透镜进行散热降温的方法,并通过理论计算及热真空实验对产品传热性能进行了验证。结果表明,通过采用石墨膜导热带,在保证高导热产品具有较好柔性的基础上,可以有效提高传热效率降低透镜温差,其传热热阻仅为同尺寸铜制导热索的48%,质量为同尺寸铜制导热索的23%。同时,为了分析卫星发射过程中的振动对石墨膜导热带传热性能的影响,在透镜组件力学振动实验时,对石墨膜导热带传热性能进行了测试分析,结果表明,卫星发射过程中的振动对石墨膜导热带传热性能无影响。

In order to guarantee the cryogenic optical system of space remote sensor working normally,the temperature of the front lens should be low,and the temperature difference between each lens should be reduced.Hence,high thermal conductivity products are needed to transport the heat to the heat sink.At present,traditional products,including heat pipe or copper braid,limited by the effect of stiffness or thermal conductivity,do not meet the requirements of temperature control.Hence,flexible heat conduction band of graphite film is used to dissipate the heat of front lens.Its performances are verified by the theoretical calculation and thermal vacuum tests.Results of testing for graphite film brand indicate that the heat transfer efficiency increases and the temperature difference of lens reduces and at the same time the product has better flexibility.Its thermal resistance is only 48%and its weight is only 23%which is compared with copper braid in the same size.Meanwhile,in order to analyze the effect of vibration during the satellite launching on the heat conduction band of graphite film,its heat transfer property is tested during the mechanical vibration test of lens components.Results indicate that the vibration has no effect on the heat transfer property of the band of graphite film.