Preliminary Research on Practical Acoustic GasThermometry Using Helium
YANG Sheng-liang1,FENG Xiao-juan1,LIN Hong1,ZHANG Jin-tao1,REN Cheng2
1. Division of Thermophysics and Process Measurements, National Institute of Metrology, Beijing 100029, China
2. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
Abstract:As a new generation nuclear reactor, reliable temperature measurement in a high temperature gas cooled reactor (HTGR) presents unique challenges. The conventional temperature measurement are based on the properties of thermometers materials calibrated by the laboratory, and thermometers could drift or even lose efficiency due to the variation of the properties and the lack of timely calibration, especially when the thermometers are exposed to high temperature and radioactive environment for a long time. Acoustic gas thermometry determines the thermodynamic temperature of a monatomic gas from measurements of the speed of sound in the gas. Because the helium in the gas-cooled reactor is stable, the temperature measurement using the speed of sound in helium could achieve higher reliability. A preliminary research on the practical acoustic gas thermometry using helium was implemented. A measurement system of the practical acoustic thermometry using cylindrical resonator was designed. The resonant frequency in helium was measured from 488K to 806K using acoustic waveguides. Then perturbations from the thermal and viscous boundary layers were corrected, and the thermodynamic temperature was determined based on the acoustic virial equation of state of helium. The relative standard deviations of the resonant frequency measurements are smaller than 0.07%, the signal to noise ratio of the measurements is acceptable. The relative difference between the thermodynamic temperature and the temperature measured by a thermocouple is less than 1%. The preliminary research supports the continuous investigation on the acoustic gas thermometry applying in harsh environments.
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