| Zugriffsnummer | 25010 |
| Dokumenttyp | Bericht |
| Sprache | Englisch |
| Titel | Working group 4 report to CCT |
| Autor(in); Institution |
Fischer, Joachim; 7.4, Temperatur, PTB-Berlin
Podesta, Michael de; National Physical Laboratory (NPL), Teddington, UK
Hill, Ken; National Research Council of Canada (NRC), Ottawa, CANADA
Moldover, Mike; National Institute of Standards and Technology (NIST), Gaithersburg, USA
Pitre, Laurent; Laboratoire National d'Essais (LNE-INM/CNAM), La Plaine-Saint-Denis, FRANCE
Steur, Peter; Istituto Nazionale di Ricerca Metrologica (INRiM), Torino, ITALY
Tamura, Osamu; National Metrology Institute of Japan (NMIJ), Tsukuba, JAPAN
White, Rod; Measurement Standards Laboratory of New Zealand, Lower Hutt, NEW ZEALAND
Yang, Inseok; Korea Research Institute of Standards and Science (KRISS), Daejeon, REPUBLIC OF KOREA
Zhang, Jintao; National Institute of Metrology (NIM), Beijing, CHINA
Rusby, Richard; National Physical Laboratory (NPL), Teddington, UK
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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), 3 S. |
| URL | |
| Berichtsnummer | CCT/10-15/rev2 |
| Konferenzangaben | 25rd CCT Meeting, Paris, 04-05 May 2010, Frankreich |
| Zusammenfassung | The report CCT/08-13/rev included a section “Analytical smooth interpolation functions”. WG4 reviewed this section, and now recommends a new interpolation function for the temperature range from the triple point of water to the freezing point of copper. The report CCT/08-13/rev gave values for T – T90 only above 4.2 K. With the recommendation included in this report the full temperature range of ITS-90, starting from 0.65 K is covered. It follows the new 3He vapour-pressure scale PTB-2006 from 0.65 K to 2 K and is consistent with the PLTS-2000. In summary, from 2.0 K to 8.0 K, WG4 recommends that the ITS-90 be used according to its definition. Above 8 K, the low temperature smooth interpolation function, Eq. (1) in CCT/08-13/rev, is recommended and below 2 K the vapour pressure polynomial of PTB-2006. WG4 is providing all results for inclusion in the mise en pratique for the definition of the kelvin. The differences T90 and the corresponding uncertainties will be listed. In addition, the two smooth interpolation functions will be included for convenience of the user. Finally, an updated summary is included with new measurements planned for the near future. |
