基于噪声温度计的铟凝固点热力学温度研究  

Thermodynamic Temperature Measurement of the Indium Freezing Point with Johnson Noise Thermometry

作　　者：周贞宇 屈继峰[2] 周琨荔 姚燕[1] 蔡晋辉[1] 曾九孙[1] 许勋 ZHOU Zhen-yu;QU Ji-feng;ZHOU Kun-li;YAO Yan;CAI Jin-hui;ZENG Jiu-sun;XU Xun(China Jiliang University,Hangzhou,Zhejiang 310018,China;National Institute of Metrology,Beijing 100029,China)

机构地区：[1]中国计量大学,浙江杭州310018 [2]中国计量科学研究院,北京100029

出　　处：《计量学报》2019年第5期804-809,共6页Acta Metrologica Sinica

基　　金：国家自然科学基金(61771441)

摘　　要：热力学温度研究表明,国际温标ITS-90定义的一系列固定点与真实热力学温度有一定差异。以量子电压标定的噪声温度计为基础,设计了用于铟凝固点测量的温度探测装置,解决了高温复杂环境下电磁干扰的抑制问题。实验采用研制的噪声温度计系统测量了铟凝固点的热力学温度,测量积分时间100h,在20~500kHz的测量带宽内得到的铟凝固点热力学温度为429.7476K,相对不确定度为11.58×10^-6,与ITS-90给出的铟凝固点值相差0.9mK。实验结果可以为国际温标的修订提供参考。Thermodynamic temperature researches show that there are certain differences between the fixed point defined in International Temperature Scale of 1990 and the real thermodynamic temperature. A heat source detection device for indium freezing point measurement is developed,and the electromagnetic interference is suppressed obviously in high temperature and complex environments based on the quantum voltage calibrated Johnson noise thermometry. Measurements over a bandwidth of 20 ~ 500 k Hz and a total integration time of 100 h gives a measured value of Tin= 429. 747 6 K,with a relative standard uncertainty of 11. 58×10^-6,the relative offset from the ITS-90 is 0. 9 m K. The results provide a reference for the revision of the International Temperature Scale.

关 键 词：计量学 噪声测温法 热力学温度 铟凝固点 国际温标 量子电压标准 

分 类 号：TB942[一般工业技术—计量学]