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Realization of the Indium Fixed Point by an Adiabatic Technique

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Abstract

This work investigates the effect of heating techniques on the realization of the ITS-90 fixed points above room temperature. For that purpose, LNE has constructed a new apparatus to realize the indium fixed point under adiabatic conditions using the “calorimetric” method. The adiabatic condition, in general, is established by maintaining a temperature difference between the fixed-point cell and its surroundings that is as small as possible. In this work, the indium fixed-point cell is located within thermally controlled heat shields whose walls also contain indium. Thus, the shields themselves are also indium cells. The experiments realizing the melting and freezing temperatures of indium using the calorimetric method are described. The results revealed the existence of thermal effects in the realization of the indium fixed-point cell by the conventional “continuous heat flux” method. The advantages of the “cell-within-cell” technique are presented.

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Authors and Affiliations

  1. Laboratoire national de métrologie et d’essais (LNE), Paris, France

    R. Morice, G. Bonnier, J. C. Barbaras, N. Fleurence, V. Le Sant, P. Ridoux & J. R. Filtz

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  1. R. Morice
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  2. G. Bonnier
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  3. J. C. Barbaras
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  4. N. Fleurence
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  5. V. Le Sant
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  6. P. Ridoux
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  7. J. R. Filtz
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Correspondence to R. Morice.

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Morice, R., Bonnier, G., Barbaras, J.C. et al. Realization of the Indium Fixed Point by an Adiabatic Technique. Int J Thermophys 29, 1785–1795 (2008). https://doi.org/10.1007/s10765-008-0445-6

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  • DOI: https://doi.org/10.1007/s10765-008-0445-6

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