Abstract
Among the activities of the European Metrology Research Programme (EMRP) project HiTeMS one work package is devoted to the development and testing of industrial solutions for long-standing temperature measurement problems at the highest temperatures. LNE-Cnam, NPL, TUBITAK-UME have worked on the design of high temperature fixed points (HTFP) suitable for in-situ temperature monitoring to be implemented in the facilities of CEA (Commissariat a l’energie atomique et aux energies alternatives). Several high temperature fixed point cells were constructed in these three national metrology institutes (NMIs) using a rugged version of cells based on the hybrid design of the laboratory HTFP developed and continuously improved at LNE-Cnam during the last years. The fixed points of interest were Co-C, Ru-C and Re-C corresponding to melting temperatures of 1324 °C, 1953 °C and 2474 °C respectively. The cells were characterised at the NMIs after their construction. Having proved robust enough, they were transported to CEA and tested in an induction furnace and cycled from room temperature to temperatures much above the melting temperatures (> +400 °C) with extremely high heating and cooling rates (up to 10 000 K/h). All the cells withstood the tests and the melting plateaus could be observed in all cases.
Highlights
In the framework of the European Metrology Research Programme (EMRP) joint research project (JRP) HiTeMS “High Temperature Metrology for Industrial Applications” several measurement problems in industrial contexts and at high temperature are being tackled [1, 2]
The project is organised in five technical work packages and among these one work package, the fourth, is devoted to the implementation and testing of self-validation techniques for non-contact thermometry up to 2500 °C with a particular emphasis on the use of these techniques for the correction of window transmission changes while measuring temperature by radiation thermometry
Three European national metrology institutes (NMIs) have joined their efforts to develop rugged cells for use in this furnace to allow radiation thermometry measurements through a window, the cells designed to work in the larger temperature gradients and heating/cooling rates used compared to the gradients and heating/cooling rates usually encountered in a metrology laboratory
Summary
In the framework of the EMRP joint research project (JRP) HiTeMS “High Temperature Metrology for Industrial Applications” several measurement problems in industrial contexts and at high temperature are being tackled [1, 2]. One of the difficulties at the highest temperatures is to monitor temperature in harsh conditions and through windows using radiation thermometers: transmission through windows is often unknown and may evolve as evaporated material is deposited during use of the furnace, especially at the highest temperatures. This is why an in-situ temperature reference can be of great help to many industrial processes [3]. The induction furnace was cycled from room temperature to temperatures much above the melting temperatures (as much as 400 °C above) with extremely high heating and cooling rates (up to 10 000 K/h)
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