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arXiv 1307.6367physics.ins-detphysics.space-ph
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用于低温空间应用的在100K附近工作的紧凑型热开关

A Compact Thermal Heat Switch for Cryogenic Space Applications Operating near 100 K

Marc Dietrich, Andreas Euler, Günter Thummes

摘要:

研制了一种适用于100 K低温空间应用的热控热开关。该开关被设计成将冷却公共焦平面阵列的两个脉冲管冷头分开。两个冷头用于冗余原因,而开关用于减少备用冷头的热损失,从而限制冷却器组件所需的输入功率、重量和尺寸。在对可能的开关技术进行初步评估后,选择了基于不同材料的热膨胀系数(CTE)的结构。提出了一种简单的设计,基于热塑性塑料,其具有已知的最高CTE之一,允许在打开状态下相对大的间隙宽度。此外,开关在正常操作期间和开关期间都不需要功率。这提高了可靠性并允许简单的机械设计。在成功构建单个交换机之后,设计并测试了第二个双交换机配置。还分析了所选热塑性塑料(超高分子量聚乙烯)在低温负荷下的长期性能。

英文摘要:

A thermal heat switch has been developed intended for cryogenic space applications operating around 100 K. The switch was designed to separate two pulse tube cold heads that cool a common focal plane array. Two cold heads are used for redundancy reasons, while the switch is used to reduce the thermal heat loss of the stand-by cold head, thus limiting the required input power, weight and dimensions of the cooler assembly. After initial evaluation of possible switching technologies, a construction based on the thermal expansion coefficient (CTE) of different materials was chosen. A simple design is proposed based on thermoplasts which have one of the highest CTE known permitting a relative large gap width in the open state. Furthermore, the switch requires no power neither during normal operation nor for switching. This enhances reliability and allows for a simple mechanical design. After a single switch was successfully built, a second doubleswitch configuration was designed and tested. The long term performance of the chosen thermoplast (ultra-high molecular weight polyethylene) under cryogenic load is also analysed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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