The Investigation of a Miniaturized Acoustic Gas Thermometer
LI Mingda1,2,XING Li2,SI Minghao2,3,FENG Xiaojuan2,ZHANG Jintao2,WANG Xiaojie1
1. College of Quality and Technical Supervision, Hebei University, Baoding, Hebei 071002, China
2. Division of Thermophysics, National Institute of Metrology, Beijing 100029, China
3. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
Abstract：To promote the practical development of acoustic gas primary thermometry, a miniaturized acoustic gas thermometer with an inner diameter of 10mm, an outer diameter of 12mm and an inner length of 40mm was developed based on the principle of measuring thermodynamic temperature by cylindrical acoustic gas resonant method. An optimized acoustic generator was used to improve the sound pressure intensity. The experiment was carried out from room temperature to 782K at atmospheric pressure. The results showed that the random deviation of the acoustic resonance frequency in atmospheric pressure air at 782K is less than 0.2% using acoustic waveguides. After correcting the boundary layer and duct perturbations, the thermodynamic temperature of 407K to 782K with room temperature as the reference was obtained with an uncertainty of 0.76K to 2.93K (k=1). The investigation provided the possibility for application of the primary acoustic gas thermometer in harsh or special environment.
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2024, Vol. 45 
