The volume of 28Si spheres about 94 mm in diameter is an input datum for the determination of the Avogadro constant. We report a finite element analysis of the self-weight effect on the volume determination via optical interferometric measurements of the sphere diameters. The self-weight expansion or shrinkage of the equatorial diameters, which ranges from −31 pm to +180 pm, depends on the southern latitude of the supports.
Self-weight effect in the measurement of the volume of silicon spheres / Mari, D; Massa, E; Kuramoto, N; Mana, G. - In: METROLOGIA. - ISSN 0026-1394. - 55:2(2018), pp. 294-301. [10.1088/1681-7575/aaaed5]
Self-weight effect in the measurement of the volume of silicon spheres
Mari, D;Massa, E;Mana, G
2018
Abstract
The volume of 28Si spheres about 94 mm in diameter is an input datum for the determination of the Avogadro constant. We report a finite element analysis of the self-weight effect on the volume determination via optical interferometric measurements of the sphere diameters. The self-weight expansion or shrinkage of the equatorial diameters, which ranges from −31 pm to +180 pm, depends on the southern latitude of the supports.| File | Dimensione | Formato | |
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