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| The Influence of the Adiabatic Properties of Cryostats on the Realization of the Equilibrium Hydrogen Triple Point |
| YE Xi-hui1,2,YU Ying2,XING Li2,FENG Xiao-juan2,ZHANG Jin-tao2,QIU Ping2,SUN Jian1 |
1. College of Mechanical and Electrical Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China;
2. Devision of Thermal Metrology Science, National Institute of Metrology, Beijing 100029, China |
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Abstract The triple point of equilibrium hydrogen (13.8033K) is one of the cryogenic fixed points with the lowest temperature specified in ITS-90 and is commonly used for the calibration of capsule standard platinum resistance thermometers(CSPRTs). A cryogen-free cryostat has been used to improve the national primary temperature standard, which can provide an ideal adiabatic environment for the realization of equilibrium hydrogen of sealed triple point, and to perform experiments of realization using calorimetry. Pre-melting of the triple point vessel due to spin-conversion catalysts of equilibrium hydrogen and differences between experimental assembling can lead to variety in the heat capacity of the vessel or the thermal resistance of the system, which can affect the realization. A heat transfer model of the system was developed and experiments were carried out under two different adiabatic conditions. The heat capacity of the assembly and the thermal resistance of the adiabatic shield and assembly were measured and the influence of the adiabatic properties of the cryostat on the realization of triple point of equilibrium hydrogen was analyzed. The results show that by measuring the thermal resistance before the start of the realization and confirming that the system has good adiabatic properties, the standard deviation of four plateau of triple point of equilibrium hydrogen is less than 0.1mK.
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Received: 30 March 2023
Published: 10 October 2023
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| Fund:National Key R&D Program of China |
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2023, Vol. 44 
