絶対圧計を用いたヘリウム4蒸気圧温度目盛の実現
2001 年 36 巻 7 号 p. 419-426
詳細
2001 年 36 巻 7 号 p. 419-426
Helium-4 vapor pressure temperature scale between 2.25K and 4.25K is realized according to the International Temperature Scale of 1990 by using an absolute pressure transducer. The pressure measurement system is much simpler than the conventional precision pressure measurement system using a pressure balance and a differential pressure transducer simultaneously. Standard-type rhodium-iron resistance thermometers are calibrated against the realized scale. The combined standard uncertainty of the calibration is estimated to be less than 0.1mK, including the uncertainty of scale realization, resistance measurement, and the residuals of the third-order polynomial fitting equation.
