1. School of Metrology and Measurement Engineering, China Jiliang University, Hangzhou, Zhejiagn 310018, China
2. Center for Advanced Measurement Science, National Institute of Metrology, Beijing 100029, China
3. Electronic Information College. Qingdao University, Qingdao, Shandong 266071, China
Abstract：The conventional Johnson noise thermometer with switchs is time-consuming and requires carefully matching of the transmission lines. A quantum-voltage-calibrated superposition thermometer to eliminate the switchs was proposed. In this configuration, matching the transmission lines is not necessary and the sense resistor can be increased to improve the signal to noise ratio. The system included a quantum voltage noise source, low-noise and low-distortion amplifiers, low-pass filters, and high performance analog to digital converters. A fourth-order fitting to eliminate the transmission line effects was used to obtain the thermodynamic temperature. Confirmatory experiments in thermostatic laboratories showed that the relative deviation between the measured temperature value and the nominal temperature value is 0.027% and the uncertainty is 0.16%, which demonstrated the feasibility of the proposed method.
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2020, Vol. 41 
