Realization of the Kilogram Based on the Planck Constant at NMIJ
Realization of the Kilogram Based on the Planck Constant at NMIJ
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NMIJ 基于普朗克常数的千克实现
DOI：
10.1109/tim.2016.2624878
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
A. Kurokawa and K. Fujii
中科院分区：
文献类型：
--
作者：
N. Kuramoto;L. Zhang;S. Mizushima;K. Fujita;Y. Azuma;A. Kurokawa and K. Fujii
有人提议改变公斤的定义。新的定义将基于普朗克常数。变更后，日本国家计量研究所（NMIJ）将使用28Si富集球体的X射线晶体密度法来实现千克。一项旨在确认新定义实现千克能力的国际等效性的试点研究正在进行中，其中通过光学干涉测量法测量富含 28Si 的球体，并通过光谱椭圆光度术和 X 射线光电子能谱对实现所需的球体表面进行表征，由 NMIJ 独立进行。根据新定义，球体质量的相对标准不确定度为 2.4 × 10-8。本文提供了测量、数据分析和不确定性评估的详细信息。
A change in the definition of the kilogram has been proposed. The new definition will be based on the Planck constant. After the change, the National Metrology Institute of Japan (NMIJ) will realize the kilogram using the X-ray crystal density method with a28Si-enriched sphere. A pilot study to confirm the international equivalence of the ability to realize the kilogram from the new definition is ongoing, where the volume measurement of a28Si-enriched sphere by optical interferometry and the sphere surface characterization by spectroscopic ellipsometry and X-ray photoelectron spectroscopy required for the realization were performed by NMIJ independently. The mass of the sphere was determined with a relative standard uncertainty of 2.4 × 10-8based on the new definition. This paper provides details of the measurements, the data analysis, and the uncertainty evaluation.