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首页> 外文期刊>International Journal of Thermophysics >Dielectric-Constant Gas-Thermometry Measuring System for the Determination of the Boltzmann Constant at PTB
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Dielectric-Constant Gas-Thermometry Measuring System for the Determination of the Boltzmann Constant at PTB

机译：用于测定PTB玻尔兹曼常数的介电常数气体温度计测量系统

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摘要

Dielectric-constant gas thermometry is being further developed at PTB to measure thermodynamic temperature and the Boltzmann constant k at the triple point of water. Due to the small electric susceptibility of gases, the targeted relative uncertainty of k of the order of 2 ppm can be achieved only if gas pressures up to 7 MPa and special 10 pF capacitors for the susceptibility measurements, including very large multi-ring toroidal cross capacitors, are used. This required development of a huge measuring system having a large heat capacity. Since the temperature measurement must be traceable to the triple point of water at a level of the order of 0.1 mK, a corresponding stability and homogeneity of the thermal conditions has to be realized. The design of the system and data characterizing its thermal parameters is described. The experimental results are compared with estimations based both on simple models and finite-element calculations.
机译：PTB正在进一步开发介电常数气体测温法，以测量水的三相点处的热力学温度和玻尔兹曼常数k。由于气体的电敏感性小，只有在气体压力高达7 MPa且使用专门用于敏感性测量的10 pF电容器（包括非常大的多环环形交叉）时，才能实现2 ppm量级的目标k相对目标不确定性。使用电容器。这需要开发具有大的热容量的巨大的测量系统。由于温度测量必须可追溯到水的三相点，水平约为0.1 mK，因此必须实现热条件的相应稳定性和均匀性。描述了系统的设计和表征其热参数的数据。将实验结果与基于简单模型和有限元计算的估计值进行比较。

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