Dury, M R; Goodman, T M; Lowe, D H; Machin, G; Woolliams, E R (2013) Development of a new radiometer for the thermodynamic measurement of high temperature fixed points. AIP Conf. Proc., 1552. pp. 65-70.

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Abstract

With measurements for Workpackage 5 of the CCT WG 5 High Temperature Fixed Point Research Plan due to commence in 2012, NPL has developed a new radiometer to measure the thermodynamic melting point temperatures of high temperature fixed points with ultra-low uncertainties. In comparison with NPL's Absolute Radiation Thermometer (ART), the 'THermodynamic Optical Radiometer' (THOR) is more portable and compact, with a much lower size-of-source effect and improved performance in other parameters such as temperature sensitivity. It has been designed for calibration as a whole instrument via the radiance method, removing the need to calibrate the individual subcomponents, as required by ART, and thereby reducing uncertainties. In addition, the calibration approach has been improved through a new integrating sphere with greater uniformity.

Item Type:	Article
Keywords:	Thermodynamic temperature, radiation thermometer, radiometer, size-of-source effect, high-temperature fixed-points
Subjects:	Optical Radiation and Photonics Optical Radiation and Photonics > Radiometry and Detectors
Identification number/DOI:	10.1063/1.4821372
Last Modified:	02 Feb 2018 13:14
URI:	https://eprintspublications.npl.co.uk/id/eprint/5963