| Zugriffsnummer | 31386 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Characterizing the new sphere interferometer for the diameter determination of the Avogadro spheres |
| Autor(in); Institution |
Mai, Torsten; 5.4, Interferometrie an Maßverkörperungen, PTB-Braunschweig
Bartl, Guido; 5.4, Interferometrie an Maßverkörperungen, PTB-Braunschweig
Nicolaus, Arnold; 5.4, Interferometrie an Maßverkörperungen, PTB-Braunschweig
Peter, Andreas; 5.4, Interferometrie an Maßverkörperungen, PTB-Braunschweig
|
| Quelle/Jahr | Measurement technology and intelligent instruments IX. Key Engineering Materials: 613 (2014), 11 - 16 |
| ISSN | 1013-9826 |
| ISBN | 978-3-03835-112-2 |
| DOI | |
| Verlag | Durnten-Zurich [u.a.]: Trans Tech Publications |
| Konferenzangaben | 11th International Symposium on Measurement Technology and Intelligent Instruments (ISMTII), Aachen and Braunschweig, 01-05, July, 2013, Germany |
| Freie Schlagworte | metrology ; interferometry ; Avogadro constant ; silicon sphere |
| Zusammenfassung | For the aimed redefinition of the SI-unit kilogram the international Avogadro group is to measure the amount of substance of a silicon sphere with a relative uncertainty of better than 2 x 10-8. Up to now 3.0 x 10-8 is reached, mainly caused by the 2.7 x 10-8 uncertainty of the volume determination. Which itself is essentially affected by the uncertainty of wave front distortion caused by optical fabrication errors and possible misalignment. To gain more information on how the wave front distortion influences the result a new interferometer with improved optics and rather large changes in the etalon is built up. A comparison of the measurements of one sphere taken with two different interferometers gives direct access to this information. Additionally a ray tracing software is being developed to simulate the alignment and measurement processes. Following the alignment steps the resulting positioning uncertainties of each element can be simulated and elements which contribute mainly to the uncertainty can be identified. This gives evidence where an improvement of the alignment techniques is most effective and necessary. With the additional use of Monte Carlo method based calculations the influence on the measurement results can be determined. |
