McEvoy, H C; Sadli, M*; Bourson, F*; Briaudeau, S*; Rougie, B* (2013) A comparison of the NPL and LNE-Cnam silver and copper fixed-point blackbody sources, and measurement of the silver/ copper temperature interval. Metrologia, 50 (6). pp. 559-571.

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Abstract

The silver and copper fixed-point blackbody sources of NPL were directly compared to those of LNE-Cnam using an IKE LP3 and an IKE LP5 at three wavelengths (650 nm, 795 nm and 903 nm). The two silver fixed-points and the two copper fixed-points were in excellent agreement with each other, with a difference of 11 mK for the silver and within 16 mK for the copper, with a combined measurement uncertainty of ~11 mK. The temperature interval between the silver and copper freezing points was also measured using combinations of all four fixed-points. The results with the NPL LP3 gave a value for the silver-copper temperature interval of 122.89 °C with an uncertainty of 0.03 °C; those with the LNE-Cnam LP5 gave a temperature interval of 122.87 °C also with an uncertainty of 0.03 °C; this compares with the ITS-90 value of 122.84 °C.

Item Type:	Article
Keywords:	silver, copper, fixed point, blackbody, radiation thermometer, comparison, ITS-90
Subjects:	Engineering Measurements Engineering Measurements > Thermal
Identification number/DOI:	10.1088/0026-1394/50/6/559
Last Modified:	02 Feb 2018 13:14
URI:	https://eprintspublications.npl.co.uk/id/eprint/6082