Progress Report on NMIJ Acoustic Gas Thermometry at the Triple Point of Water
Progress Report on NMIJ Acoustic Gas Thermometry at the Triple Point of Water
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DOI：
10.1007/s10765-017-2317-4
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发表时间：
2017
影响因子：
2.2
通讯作者：
T. Misawa;J. Widiatmo;Y. Kano;T. Sasagawa;K. Yamazawa
中科院分区：
文献类型：
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作者：
T. Misawa;J. Widiatmo;Y. Kano;T. Sasagawa;K. Yamazawa
本文报道了日本国家计量研究所在声学气体测温（AGT）系统开发方面的进展。该AGT系统是一个初始的低成本版本，使用由无氧铜制成的1- 1准球形谐振器（QSR）。在水的三相点温度下，通过测量氩气中的声速对系统进行了测试。测量是在10种不同的压力下进行的，范围从60千帕到420千帕。通过外推得到了声速平方的理想气体极限，并初步计算出了比CODATA2014值低12 ppm的玻尔兹曼常数。在微波和声学模式之间观察到很大的不一致性，这是声速测量不确定性的主要来源。该系统将通过用另一种更精确制造的QSR取代目前的QSR来改进。
Herein, progress in the development of an acoustic gas thermometry (AGT) system at the National Metrology Institute of Japan is reported. This AGT system is an initial low-cost version that uses a 1-l quasi-spherical resonator (QSR) made of oxygen-free copper. The system was tested by measuring the speed of sound in argon at the temperature of triple point of water. Measurements were conducted at ten different pressures, ranging from 60 kPa to 420 kPa. The ideal gas limit of the squared speed of sound was obtained through extrapolation, and a preliminary calculation of the Boltzmann constant, which was 12 ppm below the CODATA2014 value, was made. Large inconsistencies among microwave and acoustic modes were observed, which are dominant sources of uncertainty in speed of sound measurements. The system will be improved by replacing the present QSR with another one that is more precisely fabricated.