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Better measurements of high temperatures

Reliable measurements of high temperatures are important for industries. The ITS-90 temperature scale used in calibrations today has relatively large measurement uncertainties at high temperatures. With the support of European colleagues, the project will therefore produce better references for high temperatures.

The international temperature scale ITS-90 will continue to be used for a long time to calibrate thermometers. The scale is based on several established fixed points where phase transitions for different materials are used to calibrate thermometers with very little measurement uncertainty. However, the realisation of ITS-90 suffers from relatively large measurement uncertainties at high temperatures.

The new definition of kelvin from 2019 has opened new possibilities and methods to realize the unit of temperature, kelvin, and to establish traceability of high temperature measurements. The method involves using several known melting or freezing temperatures as fix points and using them to calibrate a radiation thermometer which is then used as a reference for further calibrations.

Establish the new methods

The new methods are already used at the major national metrology institutes in Europe, such as LNE in France. In this project, RISE and other smaller European national metrology institutes will be supported in establishing their own primary reference scales for high temperatures, by increasing competence and obtaining the knowledge of manufacturing and using the new fixed points. The new methods can significantly reduce measurement uncertainty at high temperatures, which meets the industry's need for better measurements and enables the National Laboratory for Temperature to participate in European research projects and continue to develop thermometry at high temperatures.

Summary

Project name

MultiFixRad

Status

Active

RISE role in project

Participant

Project start

Duration

36 months

Total budget

RISE: 97 500 €

Funders

Euramet, Vinnova

Project website

Project members

Contact person

Patrik Broberg

Forskare

+46 10 516 51 45

Read more about Patrik

Contact Patrik
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