Traceable Coulomb blockade thermometry
Traceable Coulomb blockade thermometry
复制标题
可追溯的库仑封锁测温
DOI：
10.1088/1681-7575/aa4f84
复制
发表时间：
2016
期刊：
影响因子：
2.4
通讯作者：
J. Pekola
中科院分区：
文献类型：
--
作者：
Ossi Hahtela;E. Mykkanen;A. Kemppinen;Matthias Meschke;Mika Prunnila;David Gunnarsson;L. Roschier;Jari Penttila;J. Pekola
我们提出了一个测量和分析方案，以确定可追溯的热力学温度在低温下使用库仑封锁测温。采用双采样数字电压表代替传统的锁相技术，提高了电测量的不确定度。剩余的不确定度主要由测量数据的数值分析决定。给出了两种分析方法：全电导曲线的数值拟合和电导倾角高度的测量。完全不确定度分析表明，两种分析方法在确定20 ~ 200 mK温度范围内的热力学温度时，相对组合标准不确定度（k = 1）均在0.5%以下。在这个温度范围内，两种分析方法得出的温度估计值与参照2000年临时低温标度校准的超导参考点装置提供的参考温度偏差在0.39%至0.67%之间。
We present a measurement and analysis scheme for determining traceable thermodynamic temperature at cryogenic temperatures using Coulomb blockade thermometry. The uncertainty of the electrical measurement is improved by utilizing two sampling digital voltmeters instead of the traditional lock-in technique. The remaining uncertainty is dominated by that of the numerical analysis of the measurement data. Two analysis methods are demonstrated: numerical fitting of the full conductance curve and measuring the height of the conductance dip. The complete uncertainty analysis shows that using either analysis method the relative combined standard uncertainty (k = 1) in determining the thermodynamic temperature in the temperature range from 20 mK to 200 mK is below 0.5%. In this temperature range, both analysis methods produced temperature estimates that deviated from 0.39% to 0.67% from the reference temperatures provided by a superconducting reference point device calibrated against the Provisional Low Temperature Scale of 2000.