Speaker
Prof.
Zhengyu Li
(Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, CAS)
Description
Self-heating of resistance thermometers is a well-known phenomenon, which occurs when the measuring current additionally heats up the sensing element.The temperature difference caused by the self-heating can be corrected by basic two-current method. However, in measurements of the highest accuracy, uncertainty of the self-heating correction, achieved by basic two-current method, may not be sufficient. More advanced methods for self-heating correction are proposed, based on the use of more than two different currents. Uncertainty of the self-heating for four methods (basic two-current method, three-current method, four-current method and five-current method) at different cryogenic temperatures is studied in this paper. The results show that the three-current method can decrease the uncertainty from 0.7 to 0.5 mK in 8 K, and from 0.84 to 0.64 mK in 10 K, compared with the two-current method. However,there is no remarkable difference between the three-current method and four-current method. In order to balance the computing time and precision,we should choose three-current method to correct the uncertainty of the self-heating.
Primary author
Dr
Kongrong Li
(Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, CAS)
Co-authors
Dr
Bin Dong
(Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, CAS)
Prof.
Gang Zhou
(Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, CAS)
Prof.
Lianyou Xiong
(Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, CAS)
Prof.
Liqiang Liu
(Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, CAS)
Prof.
Qing Li
(Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, CAS)
Prof.
Zhengyu Li
(Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, CAS)
