制冷机冷却的样品温度稳定性实验研究
发布时间：2018-08-25 19:12
【摘要】：在5.6—20 K温区内,G-M制冷机直接冷却样品会给样品上带来至少400 m K的温度波动。为了使样品上的温度波动峰峰值小于1 m K,设计了一套高精度低温温度测量系统。系统通过超临界氦和2 mm厚聚四氟乙烯片热阻相结合的方式来抑制制冷机冷头的温度波动。实验结果表明,在7 K、18.7 K、20 K温度下,样品的温度波动峰峰值始终小于0.8 m K。此外,系统通过关闭制冷机的方式,短时间内解决了样品上的机械振动问题。
[Abstract]:In the temperature range of 5.6-20 K, the temperature fluctuation of at least 400m K will be brought about when the sample is cooled directly by the G-M refrigerator. In order to make the peak value of temperature fluctuation on the sample less than 1 m K, a set of high precision and low temperature measurement system is designed. The supercritical helium combined with thermal resistance of 2 mm thick PTFE plate was used to suppress the temperature fluctuation of the chiller head. The experimental results show that the temperature fluctuation peak of the sample is always less than 0.8 m K at the temperature of 18.7 K ~ (20 K). In addition, the system solves the problem of mechanical vibration on the sample in a short time by closing the refrigerator.
【作者单位】： 中国科学院理化技术研究所低温工程学重点实验室;中国科学院大学;
【分类号】：TB651
本文编号：2203835
[Abstract]:In the temperature range of 5.6-20 K, the temperature fluctuation of at least 400m K will be brought about when the sample is cooled directly by the G-M refrigerator. In order to make the peak value of temperature fluctuation on the sample less than 1 m K, a set of high precision and low temperature measurement system is designed. The supercritical helium combined with thermal resistance of 2 mm thick PTFE plate was used to suppress the temperature fluctuation of the chiller head. The experimental results show that the temperature fluctuation peak of the sample is always less than 0.8 m K at the temperature of 18.7 K ~ (20 K). In addition, the system solves the problem of mechanical vibration on the sample in a short time by closing the refrigerator.
【作者单位】： 中国科学院理化技术研究所低温工程学重点实验室;中国科学院大学;
【分类号】：TB651
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