MultiFixRad

Project objectives

The main objective of the project is to build the capacity for more accurate high-temperature measurements at several European national laboratories while ensuring traceability to the revised SI system. The French and Turkish national temperature laboratories will assist, among others, the Norwegian Metrology Service (JV) in achieving this goal, enabling JV to offer improved services in this field (e.g. calibration). An important outcome of the project will be enhanced collaboration among participating institutes, some of which will later be able to offer specialised high-temperature measurement services.

Justervesenet’s role

Through Work Package 2, the Norwegian Metrology Service will produce fixed-point cells for radiation thermometry. In Work Package 3, it will develop a suitable radiation thermometer for measuring temperatures between the fixed points.

What does MultiFixRad stand for?

Improving the realisation of the kelvin by multiple fixed-point radiation thermometry.

• Radiation: In this context, temperature is measured by means of radiation. The key property is that a physical equation can be written to describe the relationship between radiation and temperature, containing only physical constants (Planck’s constant, the speed of light in a vacuum, and Boltzmann’s constant) and the wavelength of light (which can be measured directly or indirectly). The wavelength is a property of the pyrometer—the instrument used to measure light intensity.
• Fixed points: These are known freezing and melting points of metals, or in some cases a specific coexistence of metal and carbon. In the project, we use them as a reference. Having at least one such fixed point allows for an indirect determination of the pyrometer’s sensitivity, which is otherwise a difficult measurement.
• Multiple: With several fixed points, there is no need to measure the wavelength directly. The purpose of using multiple fixed points is not that they are strictly necessary, but that they make the work much simpler by allowing us to characterise the pyrometer indirectly.

Learn more

• Project page: EURAMET MultiFixRad 
• LinkedIn:MultiFixRad Project 
• Official website: Project website