Work2016

Realization of the kilogram based on the Planck constant at NMIJ

Naoki Kuramoto · Lulu Zhang · Shigeki Mizushima · Kazuaki Fujita · Yasushi Azuma · Akira Kurokawa +1 more

5 citations0/0 files storedConference on Precision Electromagnetic Measurements

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Scientific Measurement and Uncertainty Evaluation Advanced Measurement and Metrology Techniques Calibration and Measurement Techniques

Abstract

The change of 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 by 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 are performed by NMIJ independently.

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2012CODATA recommended values of the fundamental physical constants: 2010 2015Improved measurement results for the Avogadro constant using a28Si-enriched crystal 2014Towards a new SI: a review of progress made since 2011 2015Improvements to the Volume Measurement of 28Si Spheres to Determine the Avogadro Constant

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