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低温冷冻靶等应用要求目标控温波动度小于1m K量级。为了实现这一亚毫开级的高精度控温,并揭示控制措施对抑制温度波动的定量作用机理,基于脉管低温制冷机搭建了深冷温控测试平台。采用热阻法,即通过在制冷机冷头和被测样品之间插入不锈钢薄片组合来引入传热热阻,对模拟样品的温度波动进行实验测量,获得了制冷机二级冷头在5~30K温区的温度波动情况和传热热阻之间的定量关系。增加传热热阻是抑制温度波动的有效手段。
Applications such as cryogenic freezing target temperature control target volatility of less than 1m K magnitude. In order to realize the high-precision temperature control of this sub-mill scale and to reveal the quantitative mechanism of the control measures against the temperature fluctuation, a cryogenic temperature control test platform was set up based on the vascular cryogenic refrigerator. The thermal resistance method is introduced, in which the thermal resistance is introduced by inserting the stainless steel sheet between the cold head of the refrigerator and the sample under test. The temperature fluctuation of the simulated sample is measured experimentally. 30K temperature fluctuations in the temperature and heat transfer between the quantitative relationship. Increase heat transfer resistance is an effective way to suppress temperature fluctuations.