| Zugriffsnummer | 21682 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Construction and validation of a platinum-carbon eutectic fixed point |
| Autor(in); Institution |
Lowe, Dave; National Physical Laboratory (NPL), Teddington, UK
Anhalt, Klaus; 7.3, Hochtemperatur- und Vakuumphysik, PTB-Berlin
Hartmann, Jürgen; 7.3, Hochtemperatur- und Vakuumphysik, PTB-Berlin
|
| Quelle/Jahr | Metrologia: 45 (2008), 3, 325 - 329 |
| ISSN | 0026-1394 |
| DOI | |
| Verlag | Bristol [u.a.]: Inst. of Physics Publ. |
| Zusammenfassung | This paper details the construction of a eutectic platinum–carbon fixed point (melting point approximately 1738 °C) at the Physikalisch-Technische Bundesanstalt (PTB) and its validation by comparison with the one constructed by a PTB guest scientist at the National Metrology Institute of Japan, AIST (NMIJ). A high-temperature vacuum furnace was used to construct a metal–carbon eutectic fixed point of platinum–carbon alloys suitable for radiation thermometry or radiometry. The furnace and fixed-point filling procedure were first assessed for suitability by constructing a copper fixed point of the same dimensions. With the filling validated a platinum–carbon cell was constructed. This was then compared with the one previously constructed by the PTB in collaboration with NMIJ. The agreement between the two fixed points was (+45 ± 72) mK (k = 2), meeting the reproducibility requirements for platinum–carbon to be used as a reference standard. |
