Abackerli, A J; Butler, B P; Cox, M G (1999) Application of data fusion techniques to thermometry data. NPL Report. CISE 20/99

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Abstract

The ITS-90 scale is an internationally-agreed protocol for relating thermodynamic temperature to its practical implementation by means of Platinum Resistance Thermometers (PRTs). The key step is the calibration of PRTs at given Fixed Points of thermodynamic temperature. Thermal metrologists are continually refining the precision of these fixed points, with consequent effects on the temperature scale. The functions which are used to calibrate the PRTs are also under review, and comparison exercises are regularly undertaken to support these activities. If a revision to the scale is proposed, it needs to be supported by reliable evidence and data fusion can help in this regard. In particular, it may determine consistency between sources of data and motivate improvements to the functional approximation of the data. This report describes some numerical experiments which were performed to determine the consistency of the data sources and to develop a good overall approximation to the data, which was then compared with the ITS-90 approach.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	CISE 20/99
Subjects:	Mathematics and Scientific Computing Mathematics and Scientific Computing > Modelling
Last Modified:	02 Feb 2018 13:18
URI:	http://eprintspublications.npl.co.uk/id/eprint/1106

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