Realizing the redefined Kelvin : extending the life of ITS-90

Pearce, J. V. (avtor), Rusby, Richard (avtor), Veltcheva, R. I. (avtor), Campo, Dolores del (avtor), Garcia-Izquierdo, C. (avtor), Merlone, Andrea (avtor), Coppa, Graziano (avtor), Kowal, A. (avtor), Eusebio, L. (avtor), Bojkovski, Jovan (avtor), Žužek, Vincencij (avtor)

Following the redefinition of the kelvin, the user is presented with a more nuanced traceability route for temperature through the mise en pratique for the definition of the kelvin (MeP-K-19). Here we describe research to address several present and potential shortcomings with the current main dissemination route, namely the International Temperature Scale of 1990 (ITS-90). The ITS-90 has served the global temperature measurement community well, providing reliable, low uncertainty traceability for over 30 years. However, there are some potentially life-limiting issues for it. Among these are the impact of the main types (1 and 3) of non-uniqueness which represent an important contribution to the uncertainties achievable with the ITS-90, and the possible need to identify an alternative to the mercury triple point, a key fixed point of the ITS-90 whose use could be banned by an international treaty. Significant progress has been made in addressing these problems through a) new determinations of Type 3 non-uniqueness which have been undertaken in the range –189 °C to 156 °C; b) a comprehensive evaluation of Type 1 non-uniqueness on a large number of Standard Platinum Resistance Thermometers (SPRTs) across multiple temperature regions; c) comparison of high temperature SPRTs in pressure-controlled heat pipes to characterize Type 3 non-uniqueness between 660.323 °C and 961.78 °C and d) new designs of ▫$CO_2$▫ and ▫$SF_6$▫ cells for use with long-stem SPRTs. The fixed-point cells have been improved compared to previous versions by using purer gases and more stable and uniform temperature-controlled baths, and by the development of a flexible set-up that can accommodate both capsule and long-stem SPRTs. The effect of replacing mercury on the ITS-90 interpolating equations and uncertainty propagation has also been investigated.

• Jezik: Angleški jezik
• Ključne besede: kelvin, International Temperature Scale of 1990, standard platinum resistance thermometer, scale non-uniqueness, new temperature fixed-points
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.08 - Objavljeni znanstveni prispevek na konferenci
• Organizacija: FE - Fakulteta za elektrotehniko
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2024
• Št. strani: 020002-1-020002-9
• Številčenje: Vol. 3230, iss. 1, art. 020002
• PID: 20.500.12556/RUL-167928
• UDK: 621.317:006.91
• ISSN pri članku: 1551-7616
• DOI: 10.1063/5.0234458
• COBISS.SI-ID: 229648131
• Datum objave v RUL: 20.03.2025

Gradivo je del revije

• Naslov: AIP conference proceedings
• Skrajšan naslov: AIP conf. proc.
• Založnik: American Institute of Physics
• ISSN: 1551-7616
• COBISS.SI-ID: 519457817

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: kelvin, Mednarodna temperaturna lestvica iz 1990, standardni platinasti uporovni termometer, neenakost lestvice, nove temperaturne fiksne točke

Projekti

• Financer: Drugi - Drug financer ali več financerjev
• Program financ.: European Metrology Programme for Innovation and Research
• Številka projekta: 18SIB02
• Naslov: Realising the redefined kelvin
• Akronim: Real-K