Zinc Fixed Point Reproduction Apparatus Based on the Quasi Adiabatic
WANG Wei1,SUN Jian-ping2,ZENG Fan-cao3,FANG Xin-yun4
1. Guangzhou Institute of Measuring and Testing Technology, Guangzhou, Guangdong 510030, China;
2. National Institute of Metrology, Beijing 100029, China
3. Chengdu University of Technology, Chengdu,Sichuan 610059,China
4. Suzhou Institute of Measuring and Testing Technology, Suzhou, Jiangsu 215128, China
Abstract：The plateau of fixed-point realization is affected by many aspects in ITS-90, temperature uniformity is one of the most important factors. To improve the temperature field performance and reduce the influence caused by leakage, refer to the adiabatic principle which was widely used in the apparatus of low temperature fixed point, a zinc fixed point apparatus based on the quasi adiabatic is design.The temperature grads properties 100 mK of the traditional fixed point is reducted to 20 mK, the usage amount of metal is also reduced from 2.0 kg to 200 g. The experimental results show that the temperature plateau sustainable long time, and the reproducibility of the apparatus can be reduced to 0.1 mK.The apparatus can greatly improve the properties of temperature field, reduce the factors of interference evaluation for effect of trace impurities in high purity metal on the phase transition temperature. The miniaturization of the device can be used repeatedly to achieve economic and practical purposes, and also give the impact assessment of trace impurities in high purity metal phase change temperature which provides the basis for reduction interference of the temperature field.
王伟,孙建平,曾凡超,方信昀. 基于准绝热的锌固定点复现装置[J]. 计量学报, 2016, 37(6): 591-595.
WANG Wei,SUN Jian-ping,ZENG Fan-cao,FANG Xin-yun. Zinc Fixed Point Reproduction Apparatus Based on the Quasi Adiabatic. Acta Metrologica Sinica, 2016, 37(6): 591-595.
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2016, Vol. 37 
