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Construction of high-temperature fixed-point cells for thermodynamic temperature assignment.

Yamada, Y*; Anhalt, K*; Battuello, M*; Bloembergen, P*; Khlevnoy, B*; Machin, G; Matveyev, M*; Sadli, M*; Wang, T* (2013) Construction of high-temperature fixed-point cells for thermodynamic temperature assignment. AIP Conf. Proc., 1552. pp. 335-339.

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A multi-partner project is currently being conducted within WG5 (Radiation thermometry) of the CIPM Consultative Committee for Thermometry (CCT), which aims at assigning thermodynamic temperatures to a selected set of high temperature fixed points (HTFPs) based on metal-carbon eutectics. A work package (WP) of this project (WP2) consists in producing sets of HTFP cells to serve the final phase of the project, the definitive thermodynamic temperature measurement (WP5).

The first phase of the WP2 work consists in the construction of HTFP cells by eight National Metrology Institutes (NMIs). The four fixed-point types are the metal-carbon eutectic points, Re-C (2474 ºC), Pt-C (1739 ºC), and Co-C (1324 ºC), and the Cu point (1084.62 ºC). Instructions for cell construction based on years of experience of WG5 member NMIs are laid out in the WP protocol. Cells constructed in this way should, in principle, have the required performance in terms of the realized temperature, reproducibility, and long term stability.

The second phase of the WP2 work is the performance evaluation of the constructed cells. Four NMIs conducted the evaluation for a certain fixed-point type, with the aim of screening out cells that do not meet the predetermined selection criteria on the one hand, and to assure that sufficient variety in the sources of the cells is maintained in the final selected sets on the other hand.

This paper describes the full extent of the work encompassed within WP2. Details of the cell construction conditions and procedures, cell selection criteria, as well as performance evaluation procedures and results, are presented. The WP aims at identifying at least four cells of each of the four fixed-point types to be supplied to WP5 of the CCT-WG5 research plan for final thermodynamic temperature assignment.

Item Type: Article
Keywords: High temperature fixed points, radiation thermometry, radiometry
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Identification number/DOI: 10.1063/1.4821385
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5967

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