Abstract：Thermodynamic temperature researches show that there are certain differences between the fixed point defined in International Temperature Scale of 1990 and the real thermodynamic temperature. A heat source detection device for indium freezing point measurement is developed, and the electromagnetic interference is suppressed obviously in high temperature and complex environments based on the quantum voltage calibrated Johnson noise thermometry. Measurements over a bandwidth of 20～500kHz and a total integration time of 100h gives a measured value of Tin=429.7476K, with a relative standard uncertainty of 11.58×10-6, the relative offset from the ITS-90 is 0.9mK. The results provide a reference for the revision of the International Temperature Scale.
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2019, Vol. 40 
