Thermodynamic Temperature Measurement Using Single Cylindrical Microwave Resonator
CUI Jin1,2,FENG Xiao-juan2,LIN Hong2,ZHANG Jin-tao2,HUAN Ke-wei1
1. College of Science, Changchun University of Science and Technology, Changchun, Jilin 130022, China
2. Division of Thermophysics and Process Measurements, National Institute of Metrology, Beijing 100029, China
Abstract：Using the microwave resonant method, the thermodynamic temperature is measured in the temperature range from 253 K to 303 K based on the gas refractive index primary thermometry by using the properties for argon from“ab initio”quantum mechanics calculation theory and experimental results and the microwave resonant method. Four transverse magnetic microwave resonance frequencies were measured to obtain the refractive index in argon at 700 kPa, the consistence of the refractive index from different microwave modes was better than 1×10-8. The thermodynamic temperature then was determined by combining the refractive index measurement results and the viral equation of state for argon. The uncertainty of the difference of the thermodynamic temperature T and the ITS-90 international temperature T90 was evaluated to be 11.6 mK, and the results agreed with the Consultative Committee for Thermometry (CCT) recommendation values well. The uncertainty from this method will be decreased with the development of the theoretical calculation for argon and the improvement of the pressure measurement in the next future.
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2018, Vol. 39 
