| Zugriffsnummer | 53540 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | Gravity and anisotropy effects in the volume determination of Si spheres for the kilogram realisation |
| Autor(in); Institution |
Nicolaus, Arnold; 5.4, Interferometrie an Maßverkörperungen, PTB-Braunschweig
Kuhn, Eva; 5.4, Interferometrie an Maßverkörperungen, PTB-Braunschweig
|
| Quelle/Jahr | Metrologia: 57 (2020), 4, 1 - 9 |
| Artikelnummer | 045004 |
| ISSN | 0026-1394 (print) ; 1681-7575 (online) |
| DOI | |
| Verlag | IOP |
| Freie Schlagworte | finite element analysis ; self-weight effect ; volume determination ; silicon spheres |
| Zusammenfassung | The counting of 28Si atoms plays a fundamental role in the realisation of the unit of mass in terms of stipulated values of fundamental physical constants. In this realisation, the measurement of the volume of a 28Si sphere is a fundamental step. This paper reports a finite element analysis of the self-weight effect on the volume determination, taking the crystal anisotropy into account. The sphere volume might be overestimated from 0.3 × 1-9 to 5.1 × 10-9 (relative terms), depending on the crystal orientation and measurement procedure. |
| Kostenfreier Zugang | Freier Zugang |
| Themenbereich der Metrologie | Länge, dimensionelle Metrologie |