作者：李訏谟, 赵明坚, 陈德明

作者单位：Hart Scientific, Inc., USA

关键词：固定点; 温度; 测量; 校准; 不确定度

摘要：

本文报道了新一代的温度固定点技术。这种新技术不同于传统的固定点,其设备简单,操作方便,工作效率高,主要适用于二级和工业用温度计的检定。一种新的水三相点复现方法,无需液氮、干冰等制冷剂,能自动形成水的三相平衡态,并维持数十小时。不锈钢壳镓熔点容器及其全自动复现装置,可自动实现长达一周的熔化温度,不确定度可达0.0001℃。二级校准用纯金属固定点,包括铟、锡、锌和铝,不确定度在0.001℃~0.005℃范围内。

New generation of fixed points

LI Xu-mo, ZHAO Ming-jian, CHEN De-ming

Hart Scientific, Inc., USA

Abstract: In this paper, the new techniques to implement new generation of fixed points are reported. Compared with the traditional techniques, the new techniques have some obvious advantages in their architectures, easy operating as well as high efficiency, and are especially suitable to verification for both the second class and industrial thermomenters. A new recurrence method of triple-point of water, without using cold-producing medium like liquid nitrogen and dry ice etc., can form three-phase equilibrium of water automatically and makes it maintain a few ten hours. The recurrence set of the melting point of Ga, shelled by stainless steel, can provide a melting plateau that lasts a week and uncertainty of 0.0001℃. The frezzing points of pure metals for the second class calibration, including In, Sn, Zn and Al, have uncertainties between 0.001℃ and 0.005℃.

Keywords: Fixed point; Temperature; Mcasmement; Calibition; Umcertainty

2005, 31(1): 6-9  收稿日期: 2004-9-5;收到修改稿日期: 2004-10-16

基金项目: 

作者简介: 

参考文献

[1] Li X, et al. The Comparison of the Freezing Point of Zinc, National Conference of Standards Laboratories (NCSL) Symposium, 1995:747.
[2] Li X, et al. Realization of ITS-90 from 273.15K thorugh 1234.93K; One company's Approach, Measurement Science Conference, 1996.
[3] Li X, et al. Melting Point of Tin, National Conference of Standrds Laboratories (NCSL) Symposium, 1996, 1(1):419.
[4] Li X, Hirst M, Comparison between the Freezing Point and Melting Point of Tin, 6th International Symposium on Temperature and Thermal Measurements in Industry and Science (TEMPMEKO'96), Torino, Italy, 1996, 9:10-12.
[5] Li X, Hirst M, New Generation of fixed Points, National Conferenceof Standards Laboratories (NCSL) Symposium, 1997, 2:567.
[6] Li X, Chen D, and Zhao M, Triple Point of Water Cells, 2001 NCSL International Workshop and Symposium, 5B2(2001).