| Zugriffsnummer | 25013 |
| Dokumenttyp | Bericht |
| Sprache | Englisch |
| Titel | Working Group 3 report to CCT: May 2010 |
| Autor(in); Institution |
White, D. Rod; Measurement Standards Laboratory of New Zealand (MSL), Lower Hutt, NEW ZEALAND
Ballico, Mark; National Measurement Institute of Australia (NMIA), Lindfield, AUSTRALIA
Campo, Dolores del; Centro Espanol de Metrologia (CEM), Madrid, SPAIN
Duris, Stanislav; Slovenský Metrologický ústav (SMU), Bratislava, SLOVAKIA
Ivanova, A.; All-Russian Institute for Metrology (VNIIM), St. Petersburg, RUSSIA
Dogan, A. Kartal; Ulusal Metroloji Enstitüsü (UME), Gebze-Kocaeli, TURKEY
Filipe, E.; Instituto Portogues da Qualidade (IPQ), Caparica, PORTUGAL
Mendez-Lango, Edgar; Centro Nacional de Metrologia (CENAM), Queretaro, MEXICO
Meyer, C.; National Institute of Standards and Technology (NIST), Gaithersburg, USA
Pavese, Franco; Istituto Nazionale di Ricerca Metrologica (INRiM), Torino, ITALY
Peruzzi, Andrea; Dutch Metrology Institute (VSL), Delft, THE NETHERLANDS
Renaot, Eliane; Laboratoire National d‘Essais, Institut National de Métrologie (LNE-INM), Paris, FRANCE
Rudtsch, Steffen; 7.4, Temperatur, PTB-Berlin
Wang, T.-J.; National Institute of Metrology (NIM), Beijing, CHINA
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| Quelle/Jahr | Consultative Committee for Thermometry (CCT): Report of the 25th meeting (04-05 May 2010) to the International Committee for Weights and Measures:(2010), 11 S. |
| Berichtsnummer | CCT/10-33 |
| Konferenzangaben | 25rd CCT Meeting, Paris, 04-05 May 2010, Frankreich |
| Zusammenfassung | The CCT has completed the guide summarizing the uncertainties in the realization of the SPRT subranges of ITS-90 between the triple point of neon (24.5561 K) and the freezing point of silver (961.78 ºC). This paper identifies aspects of standard platinum resistance thermometry where either data or models are lacking and further research is required. In the calibration of SPRTs, the two main concerns are the need for data on liquidus slopes for the different impurities in the fixed points and improved understanding of the impact of the thermal environment of the fixed point on the realized temperature. In the use of SPRTs, the two largest sources of uncertainty are Types 1 and 3 non-uniqueness, and oxidation. The causes of Type 3 non-uniqueness are not yet understood, especially at low temperatures, and there is a paucity of data for the high-temperature subranges. In respect of oxidation, there is a need for validation of the models developed in the 1980s, especially in light of the reduced partial pressure of oxygen used in modern SPRTs. A range of other effects including vacancy effects in SPRTs, isotopic effects in fixed points, and improved statistical methods are discussed. |
