| Zugriffsnummer | 20006 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Towards 7 MPa pressure standards with 1·10-6 uncertainty |
| Autor(in); Institution |
Sabuga, Wladimir; 3.2, Analytische Messtechnik und Druck, PTB-Braunschweig
|
| Quelle/Jahr | International Conference on Advances in Metrology : AdMET 2006, December 11 - 13, 2006 ; [proceedings]:(2006) |
| Availability | [CD-ROM] |
| Herausgeber(in) |
Metrology Society of India (MSI)
|
| Verlag | [s.l.]: |
| Konferenzangaben | 6th International Conference on Advances in Metrology, New Delhi, 11-13, December, 2006, India |
| Zusammenfassung | For a determination of the Boltzmann constant by 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 achieveability 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 reached when p-c assemblies witha nominal effective area of 20 cm² are used as a primary standards characterized by the state-of-the-art dimensional techniques available at PTB, advanced theories for the effective area calculation are applied, and improved cross-float techniques involving differential pressure cells (DPCs) are employed, with which 2 cm² p-c assemblies covering the 7 MPa range can be linked to the 20 cm² ones, and the 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. |
