| Zugriffsnummer | 21232 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Development of pressure balances for measurement of absolute pressures up to 7 MPa with an uncertainty of 1·10-6 |
| Autor(in); Institution |
Sabuga, Wladimir; 3.2, Analytische Messtechnik und Druck, PTB-Braunschweig
|
| Quelle/Jahr | Talks of the 221st PTB Seminar "Workshop on Progress in Determining the Boltzmann Constant" held on 19th October 2006 in Berlin:(2007), 27 - 35 |
| Schriftenreihe | PTB-Bericht PTB-Th-3 |
| Herausgeber(in) |
Fellmuth, Bernd; 7.4, Temperatur, PTB-Berlin
Fischer, Joachim; 7.4, Temperatur, PTB-Berlin
|
| ISSN | 1614-0327 |
| ISBN | 978-3-86509-684-5 |
| Berichtsnummer | PTB-Th-3 |
| Verlag | Bremerhaven: Wirtschaftsverl. NW |
| Konferenzangaben | 221st PTB-Seminar "Workshop on Progress in Determining the Boltzmann Constant", Berlin, 19, October, 2006, Germany |
| Zusammenfassung | To determine the Boltzmann constant by means of the dielectric-constant gas thermometer technique, pressure standards measuring absolute pressures in helium in the range of 7 MPa with a relative standard uncertainty of 1·10-6 are required. The feasibility of such a low uncertainty with pressure balances whose piston-cylinder (p-c) assemblies are characterised by dimensional measurements is considered. It is shown that the target uncertainty can be achieved when p-c assemblies with a nominal effective area of 20 cm² are used as primary standards characterised by the state-of-the-art dimensional techniques available at PTB, advanced theories for the effective area calculation are applied, improved cross-float techniques are employed which involve differential pressure cells (DPCs) by means of which 2 cm² assemblies covering the 7 MPa range can be linked to the 20 cm² ones, and a consistency better than 1·10-6 within a group of p-c units can be demonstrated. Some results of dimensional and cross-float measurements as well as of a DPCs investigation are presented. |
