Validation of the fixed-point realization of the thermocouple scale using a radiation thermometer in the temperature range between the freezing points of Ag and Pd

被引:12
|
作者
Kim, Yong-Gyoo [1 ]
Kim, Bong Hak [1 ]
Yang, Inseok [1 ]
机构
[1] Korea Res Inst Stand & Sci, Div Phys Metrol, Taejon 305340, South Korea
关键词
CELLS; PALLADIUM; CARBON;
D O I
10.1088/0026-1394/47/3/014
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
We have developed a blackbody comparison system to validate the fixed-point realization of the thermocouple temperature scale using the radiation thermometry scale. Platinum/palladium, type S and type B thermocouples were calibrated at the fixed points of Ag, Cu, Fe-C, Co-C and Pd (only for type B). The radiation thermometer used was an LP4 linear pyrometer operating at a central wavelength of 650 nm. To assign the Fe-C eutectic melting temperature in our laboratory, a radiometric Fe-C cell was fabricated, and its melting temperature was determined as (1154.0 +/- 0.1) degrees C with k = 2. Two scales were compared from 962 degrees C to 1555 degrees C in the blackbody comparison system. The two scales were consistent within 0.5 degrees C up to 1400 degrees C, but the discrepancy for the type B thermocouple increased to 2.3 degrees C at 1554.8 degrees C. The thermocouple and radiometric scales realized at our laboratory were in agreement up to the freezing temperature of Pd within the measurement uncertainty.
引用
收藏
页码:239 / 247
页数:9
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