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EURAMET project to examine underlying parameters in radiance temperature scale realisation, 156 °C to 1000 °C.

McEvoy, H C; Martin, M J*; Steiner, A*; Schreiber, E*; Girard, F*; Battuello, M*; Sadli, M*; Ridoux, P*; Gutschwager, B*; Hollandt, J*; Diril, A*; Pehlivan, O* (2014) EURAMET project to examine underlying parameters in radiance temperature scale realisation, 156 °C to 1000 °C. Int. J. Thermophysics, 35 (3). pp. 446-466.

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Abstract

Over the medium temperature range (from 156 °C to 1000 °C) radiation thermometry is usually established within a National Metrology Institute (NMI) by means of variable temperature blackbody radiation sources, the temperature of which is determined using a platinum resistance thermometer or thermocouple, calibrated in terms of the ITS-90 and positioned in close proximity to the back radiating surface of the blackbody. As an alternative, it is also reasonably common to establish a scale using a suitable radiation thermometer, which, over this temperature range, would generally be an InGaAs-based narrow band radiation thermometer, calibrated using number of fixed-point blackbody sources from indium to silver (or copper) points. The results of such a fixed-point calibration would be fitted using a parameterised Planckian interpolation function.

During 2007 and 2008 two InGaAs-based radiation thermometers, each operating at a wavelength of nominally 1.6 ¿m, were circulated around seven NMIs within the EURAMET region (NPL (UK) (coordinator), CEM (Spain), INRiM (Italy), LNE-Cnam (France), METAS (Switzerland), PTB (Germany) and UME (Turkey) in order to undertake a comparison of parameters necessary for radiation thermometry over the medium temperature range. One of the thermometers was supplied by INRiM and had an operational temperature range of 150 °C to 1000 °C. The other was a commercially-available LP5 supplied by IKE, Stuttgart. This had an operating temperature range of 230 °C to 1085 °C.

Measurements were made of the size-of-source effect and gain (range) ratios of the two thermometers along with an assessment of the effect of changes in the ambient temperature and humidity on the thermometer output. The thermometers were also calibrated using fixed-point and/ or variable temperature blackbody sources at each institute. A brief overview of the results obtained by this project is presented in this paper.

Item Type: Article
Keywords: InGaAs radiation thermometer, fixed point, blackbody, ITS-90, comparison
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Identification number/DOI: 10.1007/s10765-014-1595-3
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/6270

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