Investigation of High-Stability Temperature Control in Primary Gas Thermometry

• Published in: Journal of thermal science Vol. 31; no. 3; pp. 765 - 776
• Main Authors: Hu, Jiangfeng, Zhang, Haiyang, Song, Yaonan, Pan, Changzhao, Gao, Bo, Liu, Wenjing, Han, Dongxu, Zhang, Zhen, Luo, Ercang, Pitre, Laurent
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.05.2022; Springer Nature B.V; Springer Verlag (Germany)
• Subjects: Classical and Continuum Physics; Control equipment; Control stability; Engineering Fluid Dynamics; Engineering Sciences; Engineering Thermodynamics; Heat and Mass Transfer; Physics; Physics and Astronomy; Resistance thermometers; Rhodium; Temperature; Temperature control; Thermometry; rhodium-iron resistance thermometer; temperature resolution; primary gas thermometry; temperature stability; temperature control; temperature control temperature stability temperature resolution rhodium-iron resistance thermometer primary gas thermometry
• ISSN: 1003-2169; 1993-033X
• DOI: 10.1007/s11630-022-1533-9

We presented a relationship between the temperature control and measurement stability limit and the temperature resolution, particularly for using rhodium-iron resistance thermometers and AC resistance bridges. Based on this, temperature control was investigated and demonstrated in primary gas thermometry under various working conditions. With optimized parameters, micro-Kelvin level temperature control stability was realized in the temperature region from 5 K to 24.5 K. The temperature control stabilities are better than 8 µK over 180 h with an integration time of 33.6 s in the concerned temperature range, closing to the limit that the sensors and the instruments can control and measure. These stabilities were significantly improved about (44 ± 8)% at 24.5 K and (70 ± 7)% at 5 K comparing with our previous work (Chen et al., Cryogenics, 2019, 97: 1–6).