基于闭环制冷机的平衡氢三相点复现装置

An Automated System for Realizing the Triple Point of Equilibrium Hydrogen Based on Closed-cycle Refrigerator

为了解决平衡氢三相点复现装置复现难度大、耗时长、效率低的问题,研制了基于闭环GM制冷机的新型平衡氢三相点复现装置。采用准绝热方法复现平衡氢三相点;基于Labview程序,实现了复现过程的自动测量与控制。该套装置不仅提高了工作效率,而且提升了复现性。实验结果表明:该套系统平衡氢三相点的复现性优于0.05 m K,标准不确定度优于0.1 m K。

The TPH （triple point of equilibrium hydrogen） is one of the reference fixed points at the low-temperature rang in the international temperature scale of 1990（ITS-90） and the national primary fixed point of the temperature. In the previous primary temperature standard facility, the realization process of the TPH is time-consuming and inefficient. In order to solve these problems, a new type of realization facility of the TPH based on closed-cycle refrigerator, realized the TPH under the quasi-adabatic condition, has been developed by National Institute of Metrology of China. The program based on the Labview is used for instrument controlling and automatic measuring. The facility improves both efficiency and measurement accuracy. The results show that the repeatability of the TPH is better than 0.05 mK and the standard uncertainty is better than 0.1 mK