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The effect of changing calibration traceability for radiation thermometry from the current International Temperature Scale of 1990 (ITS-90) to a proposed SI based scale is investigated in the context of the dissemination of a radiation thermometer based high temperature scale from national measurement institute to calibration laboratory. It is shown that at temperatures up to 2500 °C the uncertainty in temperature scale realisation can be halved without changing the calibration laboratory methodology. Significant benefits are possible now, based on present ITS-90, in advance of any proposed changes. The requirements for a suitable radiation thermometer to achieve this are considered.

Reducing uncertainty in practical radiation thermometer calibration based on proposed changes to themise en pratiqueof the definition of the kelvin