The Euramet Metrology Research Programme Project Implementing the New Kelvin (InK)

Abstract

The kelvin, along with the ampere, kilogram, and the mole are likely to\ud be redefined in terms of fundamental constants, in line with Conférence Générale\ud des Poids et Mesures resolution 1 (2011), sometime before 2020. In advance of,\ud and to support, the redefinition, a mise en pratique of the definition of the kelvin\ud (MeP-K) is currently being prepared. The Euramet Metrology Research Programme\ud Implementing the newkelvin (InK) project will coordinate research activity in this field\ud with the objective of improving primary thermometry over the range from 0.0009K\ud to >3000K. Specifically, the project will aim to pursue the following three broad\ud objectives: (1) Support the development of primary thermometry techniques for the\ud realization and dissemination of thermodynamic temperatures, particularly at high\ud (>1300K) and low (<1K) temperatures. This is a major objective of InK because\ud primary thermometry methods at the extremes of temperature should, in principle,\ud have lower uncertainties than defined scales. (2) Determine low uncertainty values\ud of T − T90 in the temperature region where the defined scale is expected to continue\ud providing the lowest uncertainties. This will support the development of theMeP-K and\ud help in the construction of a reliable data set for any possible future temperature scale.\ud (3) Use different thermodynamic thermometry methods to re-determine T − T2000 and therefore hopefully understand the cause of the discrepancy in the background\ud data that constitutes the Provisional Low Temperature Scale of 2000 (PLTS-2000).\ud An overview of the InK project, activities, and intended outcomes is given in this paper

Progress towards the determination of thermodynamic temperature with ultra-low uncertainty

“…These deficiencies ultimately limit the effectiveness of the dissemination of both the present and the future definition of the kelvin. In response to this recognized metrological need, a campaign of thermodynamic temperature measurements was organized within the framework of activities of the European Metrology Research Programme (EMRP) project denominated 'Implementing the new kelvin' (InK) [5]. Figure 1 graphically summarizes the temperature ranges covered by the InK project, by a number of different thermodynamic thermometry methods.…”

Experimental assessment of methods of dissemination of the thermodynamic temperature at the highest temperatures

“…The InK project [3,4] contains four technical work packages with the following objectives/work packages, including activities already planned in a concerted international research project [5]:…”

“…A joint research project (JRP), "Implementing the new kelvin, InK", funded by the European Metrology Research Programme (EMRP) was launched in September 2012 [3] to prepare the implementation of the new definition of the kelvin with two main assigned objectives in the high temperature range: assigning thermodynamic temperatures to a set of selected high- This paper will focus on the content of the work package devoted to the realisation and the dissemination of thermodynamic temperatures above 1000 °C. It describes the activities performed to achieve an assessment of the possibilities of dissemination using either high-temperature fixed points or radiometers/pyrometers.…”

Study of the system responsivity to measure the blackbody's temperature by optical pyrometry from 1200 K to 1570 K

“…This has been followed by the Consultative Committee for Thermometry (CCT) to develop and improve the thermal and radiometric performance of metal (carbide)-carbon (M(C)-C) fixed points [6,7]. The efficacy of this method is part of a study that was made as well in the context the European Metrology Research Programme (EMRP) joint project 'Implementing the new kelvin' (Ink) [8] was focused on preparing the temperature metrology community for a comprehensive and effective redefinition of the kelvin [9].…”