Article2011

Diameter Comparison of a Silicon Sphere for the International Avogadro Coordination Project

Naoki Kuramoto · Kenichi Fujii · Arnold Nicolaus · Guido Bartl · Malcolm B. Gray · P. J. Manson +1 more

21 citations0/0 files storedIEEE Transactions on Instrumentation and Measurement

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Scientific Measurement and Uncertainty Evaluation Optical measurement and interference techniques Advanced Measurement and Metrology Techniques

Abstract

In the International Avogadro Coordination (IAC) Project using the X-ray crystal density method, volume measurements of silicon spheres by optical interferometry play a crucial role for the density measurement of the28Si-enriched crystal. To confirm the reliability of the volume measurement, specified diameters of a silicon sphere were measured independently by optical interferometers at NMIJ (Japan), PTB (Germany) and NMIA (Australia). The sphere was washed before the measurement with the same procedure. The directions of the diameters were identified with reference marks prepared on the surface of the sphere. All of the results agree with each other within their uncertainties. This strongly confirms the reliability of the diameter and volume measurements in the IAC project.

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References

1990The International Temperature Scale of 1990 (ITS-90)2006Considerations on future redefinitions of the kilogram, the mole and of other units 2006Large-scale production of highly enriched28Si for the precise determination of the Avogadro constant 1991The possible role of the fundamental constants in replacing the kilogram 2005Present State of the Avogadro Constant Determination From Silicon Crystals With Natural Isotopic Compositions 1974A density scale based on solid objects 2004Present Status of the a Vogadro Constant Determination from Silicon Crystals with Natural Isotopic Composition 1987Polishing a 1-kg silicon sphere for a density standard

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2016Surface Layer Analysis of a 28Si-Enriched Sphere Both in Vacuum and in Air by Ellipsometry 2019Silicon spheres for the future realization of the kilogram and the mole 2021Reproducibility of the Realization of the Kilogram Based on the Planck Constant by the XRCD Method at NMIJ 2018Volume Measurement of a 28Si-Enriched Sphere for a Determination of the Avogadro Constant at NMIJ

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