A SQUID-based primary noise thermometer for low-temperature metrology
A SQUID-based primary noise thermometer for low-temperature metrology
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DOI：
10.1098/rsta.2015.0050
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发表时间：
2016-03-28
期刊：
影响因子：
5
通讯作者：
Engert, J.
中科院分区：
文献类型：
--
作者：
Kirste, A.;Engert, J.
根据国际单位制的实际温度测量需要可追溯至当前有效的国际温标。随着人们期待的基于玻尔兹曼常数的温度单位开尔文的重新定义，未来其实践将允许使用经批准的初级测温方法来实现和传播开尔文。为了支持这一过程，我们开发了一种基于直流超导量子干涉装置的噪声温度计，专门用于测量从 5K 到 1mK 以下的宽温度范围内的热力学温度。在本文中，我们详细描述了初级磁场波动温度计和用于温度测定的基础模型。实验测量结果与 0.7K 至 16mK 之间的临时低温标度 2000 进行比较，包括测量的热力学温度的不确定度预算。在此设置中，相对组合标准不确定度等于 0.6%。
Practical temperature measurements in accordance with the international system of units require traceability to the international temperature scales currently in force. Along with the awaited redefinition of the unit of temperature, the kelvin, on the basis of the Boltzmann constant, in future its mise en pratique will allow the use of approved methods of primary thermometry for the realization and dissemination of the kelvin. To support this process, we have developed a DC superconducting quantum interference device-based noise thermometer especially designed for measurements of thermodynamic temperature in a broad temperature range from 5K down to below 1mK. In this paper, we describe in detail the primary magnetic field fluctuation thermometer and the underlying model applied for the temperature determination. Experimental measurement results are presented for a comparison with the Provisional Low Temperature Scale 2000 between 0.7K and 16mK including an uncertainty budget for the measured thermodynamic temperatures. In this setup, the relative combined standard uncertainty is equal to 0.6%.