Abstract
There is an on-going requirement to perform scale comparisons above the silver point \((962\,^\circ \hbox {C})\) with reduced uncertainties. Previous comparisons have been performed with high stability lamps or radiation thermometers, neither of which were able to achieve the required uncertainty. Ideally a set of driftless unknown temperature fixed points would be used to compare scales, but up to now such artifacts did not exist. This study develops blind high-temperature comparison artifacts based on doped versions of the high-temperature fixed point (HTFP) Ni–C (nominal temperature \(1329\,^\circ \hbox {C}\)). At INMETRO three HTFP blackbodies were constructed, one of pure Ni–C and two doped with different levels of Cu. To ascertain the effect of doping on the transition temperature, the cells were compared to the reference pure Ni–C cell. The doped cells were then transported to NPL and their temperatures measured. NPL was not informed of the INMETRO result ensuring that the measurements remained blind. The cells were then returned to INMETRO and re-measured to establish their stability. The temperatures measured at INMETRO and NPL were then compared and showed very good equivalence of the scale at the fixed-point temperatures. The results of the comparison of the NPL and INMETRO temperature scale, at nominally \(1329\,^\circ \hbox {C}\), are reported, along with evidence of the stability of the artifacts determined from repeat measurements. These promising results indicate that it may be possible to make HTFPs with altered temperatures which are stable enough to serve as comparison artifacts.
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References
H. Preston-Thomas, Metrologia 27, 3/107 (1990)
R.D. Lee, H.J. Kostkowski, T.J. Quinn, P.R. Chandler, T.P. Jones, J. Tapping, H. Kunz, in Temperature: Its Measurement and Control in Science and Industry, vol. 4, ed. by H.H. Plumb (Instrument Society of America, Pittsburgh, PA, 1972)
H.C. McEvoy, K.M. Raven, A.I. Pokhodoun, M.S. Matveyev, in Proceedings of TEMPMEKO ’96, 6th International Symposium on Temperature and Thermal Measurements in Industry and Science, ed. by P. Marcarino (Levrotto and Bella, Torino, 1997), pp. 272–277
F. Sakuma, H. Sakate, B.C. Johnson, C. Gibson, G. Machin, T. Ricolfi, M. Battuello, J. Fischer, H.-J. Jung, Metrologia 33, 241 (1996)
G. Machin, T. Ricolfi, M. Battuello, G. Negro, H.-J. Jung, P. Bloembergen, J. Ivarsson, T. Weckstrom, Metrologia 33, 197 (1996)
G. Machin, in Proceedings of Ninth International Temperature Symposium (Los Angeles), Temperature:Its Measurement and Control in Science and Industry, vol. 8, ed. by C.W. Meyer, AIP Conference Proceedings 1552 (AIP, Melville, NY, 2013), pp. 305–316. doi:10.1063/1.4821383
G. Machin, W. Dong, M.J. Martín, D. Lowe, T.J. Wang, X. Lu, Int. J. Thermophys. 31, 1466 (2010)
Y. Yamada, Y. Duan, M. Ballico, S.N. Park, F. Sakuma, A. Ono, Metrologia 38, 203 (2001)
G. Machin, C. Gibson, D. Lowe, D. Allen, H.W. Yoon, in Proceedings of TEMPMEKO 2004, 9th International Symposium on Temperature and Thermal Measurements in Industry and Science, ed. by D. Zvizdić, L.G. Bermanec, T. Veliki, T. Stašić (FSB/LPM, Zagreb, Croatia, 2004), pp. 1057–1062
G. Machin, W. Dong, M.J. Martín, D. Lowe, Z. Yuan, T. Wang, X. Lu, Metrologia 48, 196 (2011)
R. Teixeira, G. Machin, A. Orlando, in Proceedings of Ninth International Temperature Symposium (Los Angeles), Temperature: Its Measurement and Control in Science and Industry, vol. 8, ed. by C.W. Meyer, AIP Conference Proceedings 1552 (AIP, Melville, NY, 2013), pp. 363–368. doi:10.1063/1.4821388
R. Teixeria, G. Machin, A. Orlando, Int. J. Thermophys. 35, 467 (2014). doi:10.1007/s10765-014-1571-y
J. Hartmann, K. Anhalt, J. Hollandt, E. Schreiber, Y. Yamada, Temperature 2003 (VDI-Bericht 1784, Berlin, 2003)
B. Chu, H. McEvoy, J. Andrews, Meas. Sci. Technol. 5, 12 (1994)
D. Lowe, K. Mingard, Z. Malik, P. Quested, Int. J. Thermophys. 28, 2019 (2007)
C.E. Brookley, W.E. Llewellyn, in Temperature: Its Measurement and Control in Science and Industry, vol. 6, ed. by J. Schooley (AIP, Melville, NY, 1992)
P. Bloembergen, Y. Yamada, N. Sasajima, Y. Wang, T. Wang, Metrologia 44, 279 (2007)
Acknowledgments
GM and DHL acknowledge funding from the Engineering and Flow Programme funded by the National Measurement Office. Xiaofeng Lu acknowledges funding from the NPL International Programme for funding his secondment to NPL.
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This work was performed by X. Lu whilst on secondment to NPL.
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Machin, G., Teixeira, R., Lu, X. et al. Bilateral Comparison Between NPL and INMETRO Using a High-Temperature Fixed Point of Unknown Temperature. Int J Thermophys 36, 327–335 (2015). https://doi.org/10.1007/s10765-014-1749-3
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DOI: https://doi.org/10.1007/s10765-014-1749-3