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Josephson Voltage Metrology for Watt Balance Experiments at NIST

机译：NIST的功率平衡实验的Josephson电压计量

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摘要

The Planck constant, h, is one of the seven fundamental constants proposed to redefine the SI. It has been measured by the watt balance experiments since the 1980s. In its early days, the watt balance experiment played a vital role in determining the Josephson constant K_(J-90) which was adopted internationally on January 1, 1990. The development of Josephson technology, especially the implementation of the Programmable Josephson Voltage Standard (PJVS) in voltage metrology has improved the uncertainty of voltage measurement in the watt balance experiment by more than two orders of magnitude. The Josephson voltage measurement in the watt balance experiment plays an important role in the proposed SI redefinition based on a set of fundamental constants. This paper will describe a brief history from the original NIST-1 watt balance in 1980s up to the most recent development of the NIST-4 watt balance. We will also discuss the role of voltage metrology in the watt balance experiments and the impact of the SI redefinition to the voltage metrology in the future.
机译：普朗克常数h是为重新定义SI提出的七个基本常数之一。自1980年代以来，就已经通过功率平衡实验对其进行了测量。早期，功率平衡实验在确定1990年1月1日国际上采用的约瑟夫森常数K_（J-90）方面起着至关重要的作用。约瑟夫森技术的发展，尤其是可编程约瑟夫森电压标准（电压计量学中的PJVS）已将瓦特平衡实验中电压测量的不确定性提高了两个数量级以上。瓦特平衡实验中的约瑟夫森电压测量在建议的基于一组基本常数的SI重新定义中起着重要作用。本文将介绍从1980年代最初的NIST-1瓦特天平到NIST-4瓦特天平的最新发展的简短历史。我们还将讨论电压计量在瓦特平衡实验中的作用以及将来SI重新定义对电压计量的影响。

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