Development of an adiabatic calorimeter in the range 54K-273K in frame of a scientific collaboration LNE-NIS
Development of an adiabatic calorimeter in the range 54K-273K in frame of a scientific collaboration LNE-NIS
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在 LNE-NIS 科学合作框架内开发 54K-273K 范围内的绝热热量计
DOI：
10.1063/1.4819531
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Y. Hermier
中科院分区：
文献类型：
--
作者：
M. Ahmed;Y. Hermier
国家标准研究所(NIS)与法国国家计量研究所(LNE-CNAM)合作，最近开发了一种新的绝热量热计，以使用胶囊标准铂电阻温度计(CSPRT)在54K至273K的温度范围内实现1990年的国际温标(ITS-90)。这项工作是通过双方的国际科学合作项目“Imhotep”实现的。新的热量计包括一个圆柱形双壁真空密封不锈钢杜瓦，它可以承受液氮的真空，以达到接近氧气三相点的温度。隔热罩容纳了一个多隔室电池，其中包含氧气和Ar三点电池。通过在LabVIEW环境下运行的PID软件，实现了最佳绝热条件下的温度控制。已经建造了两个量热计。第一个装置安装在LNE-CNAM上，并测试了最佳绝热条件。然后，该系统被转移到NIS。第二个量热计被测试并留在LNE-CNAM。NIS的实验表明，温度有可能达到接近氧气三相点的温度。对于氧气和Ar的三个点，CSPRT校准的不确定度分别为0.27和0.25mK。
The National Institute for Standards (NIS), in cooperation with the French National Metrology Institute (LNE-CNAM), has recently developed a new adiabatic calorimeter, to realize the International Temperature Scale of 1990 (ITS-90) in the temperature range between 54 K and 273 K using Capsule Standard Platinum Resistance Thermometers (CSPRTs). The work has been realized through an international scientific-cooperation project "IMHOTEP" between the two sides. The new calorimeter comprises a cylindrical double-wall vacuum-tight stainless steel Dewar that withstands evacuation on the liquid nitrogen to reach a temperature close to the oxygen triple point. The thermal shield accommodates a multi-compartment cell containing the oxygen and argon triple-points cells. The temperature control for best adiabatic conditions is achieved through PID software, running under LABVIEW environment. Two calorimeters have been constructed. The first one was installed at LNE-CNAM and tested for optimum adiabatic conditions. The system was then transferred to NIS. The second calorimeter was tested and stayed at LNE-CNAM. Experiments, at NIS, showed the possibility of reaching a temperature close to the oxygen triple point. Uncertainties for CSPRTs calibrations were 0.27 and 0.25 mK for triple points of oxygen and argon respectively.