The Design and Development of a Tabletop Kibble Balance at NIST
The Design and Development of a Tabletop Kibble Balance at NIST
复制标题
NIST 桌面粗磨天平的设计和开发
DOI：
10.1109/cpem.2018.8501109
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
S. Schlamminger
中科院分区：
文献类型：
--
作者：
L. Chao;F. Seifert;D. Haddad;S. Schlamminger
重新定义国际单位制（SI）的全球范式转变正在顺利进行，从基于七个基本单位的系统转变为七个基本常数。更具体地说，质量单位，千克，将通过普朗克常数$h$的固定值来实现，基布尔平衡（KB）作为实现这一点的方法。在过去几十年中，世界各地的国家计量机构都在投资开发知识库，大多数旨在实现I-kg级别的质量单位，其不确定性约为108分之几。然而，在确定普朗克常数后，质量可以在任何水平上直接实现，认为千克只是历史上唯一的基准。美国国家标准与技术研究所（NIST）目前正在开发一种桌面大小的粗粒天平（KIBB-gI），该天平设计用于在克级范围内工作，其不确定性约为106分之几。
A global paradigm shift to redefine the International System of Units (SI) from a system based on seven fundamental units to seven fundamental constants is well under way. More specifically, the unit of mass, the kilogram, will be realized via a fixed value of the Planck constant $h$ and a Kibble balance (KB) serves as a method of achieving this. Over the past few decades, national metrology institutes around the world have invested in developing KBs, the majority aimed at realizing the unit of mass at the I-kg level with uncertainties on the order of a few parts in 108. However, upon fixing the Planck constant, mass can be directly realized at any level, deeming the kilogram only a historically unique benchmark. At the National Institute of Standards and Technology (NIST), a tabletop-sized Kibble balance (KIBB-gI) designed to operate at the gram-level range with uncertainties on the order of a few parts in 106 is currently under development.