Development of a two-dimensional dark fringe method to measure sphere diameters and an accurate determination of the Avogadro constant by using a 28Si crystal
| Project/Area Number |
24360037
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Applied physics, general
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| Research Institution | National Institute of Advanced Industrial Science and Technology |
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Principal Investigator |
KURAMOTO NAOKI 独立行政法人産業技術総合研究所, 計測標準研究部門, 主任研究員 (60356938)
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| Co-Investigator(Kenkyū-buntansha) |
WASEDA Atsushi 産業技術総合研究所, 計測標準研究部門, 主任研究員 (20272172)
AZUMA Yasushi 産業技術総合研究所, 計測標準研究部門, 主任研究員 (30356365)
FUJIMOTO Hiroyuki 産業技術総合研究所, 計測標準研究部門, 主任研究員 (30357917)
FUJII Kenichi 産業技術総合研究所, 計測標準研究部門, 首席研究員 (50357901)
水島 茂喜 独立行政法人産業技術総合研究所, 計測標準研究部門, 主任研究員 (60358091)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥20,020,000 (Direct Cost: ¥15,400,000、Indirect Cost: ¥4,620,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
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| Keywords | 基礎物理定数 / 標準 / アボガドロ定数 / 光周波数制御 / 超精密計測 |
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| Outline of Final Research Achievements |
The kilogram is currently defined by the international prototype of the kilogram. To redefine the kilogram based on fundamental constants, a two-dimensional dark fringe method to measure diameters of 1 kg Si spheres has been developed and a 28Si-enriched crystal has been used to determine the Avogadro constant by the X-ray crystal density method. The volume and mass of two 1 kg 28Si spheres have been measured by using a laser interferometer and a vacuum balance, respectively. The surface of the spheres has been analyzed by a spectroscopic ellipsometer calibrated by X-ray reflectometry. The Avogadro constant has been determined with a relative uncertainty of 2.0E-8. This is the most accurate value directly determined experimentally to date, resulting in a strong trigger to conduct the redefinition of the kilogram based on the fundamental constants in 2018.
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Report
(4 results)
Research Products
(39 results)
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[Journal Article] European Metrology Reserach Prgramme: Advances on the Realization of the Kilogram Redefinition2014
Author(s)
T. Arnold, H. Baumann, H. Bettin, F. Bielsa, A. Eichenberger, Naoki Kuramoto, G. Mana, E. Massa, S. Merlet, F. Pereira dos Santos, A. Picard, P. Pinot, F. Piqumal
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Journal Title
Digest of Conference on Precision Electromagnetic Measurements 2014
Volume: -
Pages: 426-427
DOI
Related Report
Peer Reviewed
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[Journal Article] Realization of the anticipated definition of the kilogram2012
Author(s)
H. Baumann, H. Bettin, F. Bielsa, A. Eichenberger, G. Geneves, N. Kuramoto, G. Mana, E. Massa, F. Pereira dos Santos, A. Picard, P. Pinot, A. Shindler
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Journal Title
Digest of Conference on Precision Electromagnetic Measurements 2012
Pages: 340-341
Related Report
Peer Reviewed
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[Presentation] Realization of the anticipated definition of the kilogram2012
Author(s)
H. Baumann, H. Bettin, F. Bielsa, A. Eichenberger, G. Geneves, N. Kuramoto, G. Mana, E. Massa, F. Pereira dos Santos, A. Picard, P. Pinot, A. Shindler
Organizer
Conference on Precision Electromagnetic Measurements 2012
Place of Presentation
アメリカ合衆国、ワシントンDC, Gaylord National Resort
Year and Date
2012-07-03
Related Report
