1. School of Quality and Technical Supervision, Hebei University, Baoding, Hebei 071002, China
2. National Institute of Metrology, Beijing 100029, China
Abstract A calibration method for high-temperature thermocouples, as tungsten-rhenium couples, was designed based on the high temperature blackbody furnace at the National Institute of Metrology(NIM). The axial uniformity of the optimally designed cavity in the temperature thermostat was measured less than 0.5℃ within 20mm depth. The radiance temperature difference between the selected cavity and the central one was less than 0.5℃. The calibration method based on the high temperature blackbody furnace was verified by Pt-10% Rh/Pt thermocouple. The calibration error from 800℃ to 1300℃ was less than 0.5℃, and the uncertainty was estimated 0.8~1.5℃, k=2. In the range of 800~1900℃, the electromotive force of tungsten-rhenium thermocouple from different manufactures was calibrated, and the uniformity of the wires before and after calibration was also tested. The calibration result showed that the relative error of the tungsten-rhenium thermocouple was kept within 1%, and the uncertainty was estimated 3.7~13.0℃, k=2 which was about 0.7%t in the relative uncertainty.
NIU Xing-jun,ZHANG Ting-ting,FANG Li-de, et al. Calibration of Tungsten-Rhenium Thermocouple Based on High Temperature Blackbody Furnace[J]. Acta Metrologica Sinica, 2022, 43(5): 590-596.
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2022, Vol. 43 
