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Master Thesis

Mise en place d’un banc de référence de volume et masse volumique à l’aide d’une référence solide : la sphère de silicium

Abstract : For a long time, National Metrology Institutes, NMIs, have been working towards a new definition of the kilogram. Perfect silicon spheres have been manufactured for metrological research, particularly to determine the Avogadro constant. The volume of these spheres have been calibrated with a relative uncertainty of 7x10-9 [1, 2] and the density with relative uncertainty of 1x10-7 [3]. Such spheres are now used as solid volume and density references in several NMIs instead of bi-distilled water which was a density reference non-traceable to the SI, calculated in agreement with SMOW formula recommended by the International Committee for Weights and Measures, CIPM [4]. The best capabilities for calibration according to this previous method were about 4x10-6. The goal of this study is to introduce a new method, using a silicon sphere as a solid volume and density reference both to reduce uncertainty and be traceable to the SI.
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Master Thesis
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Marc Lefebvre. Mise en place d’un banc de référence de volume et masse volumique à l’aide d’une référence solide : la sphère de silicium. Autre. 2018. ⟨dumas-01980976⟩

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