紫外成像光谱仪焦面CCD散热设计及验证

为保证空间紫外成像光谱仪焦面电荷耦合器件（CCD）在低温环境下的工作性能，需对焦面CCD进行散热设计。首先，根据焦面CCD的热耗、工作模式及温度要求，提出以高性能柔性石墨导热索为主要措施的散热设计方案，建立热仿真模型并进行热分析。然后，在真空环境下进行焦面CCD热平衡试验，结果显示:柔性导热索的CCD连接端与热管连接端温差仅为2.3 ℃，以此推算出导热索自身热阻为0.65 ℃/W，满足热阻小于1 ℃/W的指标要求，具有良好的导热性能；焦面CCD在长期工作模式下的温度为-21.4 ℃，满足低于-20 ℃的工作温度要求。仿真分析和试验结果基本一致，表明采用柔性石墨导热索结合热管的焦面CCD散热设计方案合理可行。

Heat dissipation design and verification of focal plane CCD for ultraviolet imaging spectrometer

In order to ensure the working performance of focal plane charge coupled device (CCD) space ultraviolet imaging spectrometer (UVIS) at low temperature, it is necessary to carry out the heat dissipation design of focal plane CCD. Firstly, according to the heat consumption, working mode and temperature requirements of focal plane CCD, a heat dissipation design scheme with high-performance flexible graphite thermal strap as the main measure was proposed, a thermal simulation model was established, and the thermal analysis was performed. Then, the thermal balance test of focal plane CCD was carried out under vacuum. The test results show that the temperature difference between the CCD connecting end of the flexible thermal strap and the connecting end of the heat pipe is only 2.3 ℃, inferring that the thermal resistance of the thermal strap is 0.65 ℃/W, which meets the design requirement of thermal resistance smaller than 1 ℃/W and means good thermal conductivity. The temperature of focal plane CCD in long-term working mode is -21.4 ℃, which meets the requirement of working temperature lower than -20 ℃. Both simulation analysis and experiment show that the heat dissipation design scheme of focal plane CCD using flexible graphite thermal strap combined with heat pipe is reasonable and feasible.