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Dissémination de la température thermodynamique par des points fixes à haute température : vers une nouvelle mise en pratique du kelvin

Abstract : Research dedicated to high-temperature-fixed-points (HTFPs) have been intensified since 1996, further to a recommendation of the Consultative Committee for Thermometry to develop references above 2000 °C. National Laboratories of Metrology envolved in the development of HTFPs based on metal-carbon alloys. These fixed points showed phase transitions at reproducible temperatures independently to the proportion of carbon in the metal. The international projects that followed the first developments allowed increasing the robustness and the long-term stability of the fixed points and highlighted the importance of the thermal conditions of implementation. Today these fixed points show a reproducibility of about 0.1 °C and are on the way to strengthen the accuracy of radiation thermometry measurements at high temperatures, up to now, limited by the uncertainty of the International Temperature Scale (ITS-90). A project to measure the thermodynamic temperature of the most studied HTFPs by a radiometric method was recently led. Results of this absolute measurement is a step towards the future mise en pratique of the kelvin at high temperature, by a direct dissemination of the thermodynamic temperature without any link to the ITS-90. This document describes the main steps from the conception of these new references, up to the measurement of their thermodynamic temperature.
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https://tel.archives-ouvertes.fr/tel-01699906
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Submitted on : Friday, February 2, 2018 - 7:35:07 PM
Last modification on : Thursday, September 19, 2019 - 3:40:16 PM
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Frédéric Bourson. Dissémination de la température thermodynamique par des points fixes à haute température : vers une nouvelle mise en pratique du kelvin. Thermique [physics.class-ph]. Conservatoire national des arts et metiers - CNAM, 2017. Français. ⟨NNT : 2017CNAM1147⟩. ⟨tel-01699906⟩

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