There has been a long-standing requirement for high temperature fixed-points above the copper point for improving both thermometry and radiometry. With the advent of metal-carbon eutectics as high temperature fixed-points (HTFP) it is now clear that this requirement can be met. This programme of research aims to overcome the technical barriers that remain in turning these new fixed-points into fully-fledged metrology tools for general use by the world metrology community.
The project is broken down into seven workpackages these with a brief outline of the technical content.
Confirm long term stability and robustness of the high temperature fixed-points (WP1, LNE-INM/Cnam).
Develop fixed-point construction methodology to ensure intra-cell repeatability at the sub-100 mK level, construct set of definitive cells (WP2, NMIJ).
Clearly understand the furnace/fixed-point/pyrometer interactions, and quantify associated uncertainties (WP2, NMIJ).
Assessment and improvement of absolute thermometry capability of all participants (WP4, PTB).
Multilateral assignment of thermodynamic temperatures to be a set of high quality reference high temperature fixed-point cells (WP5, NPL).
Recommendations to CCT how to revise ITS-90 to make step change improvement in high temperature thermometry (WP6, NPL).
[Dec 06]a) One of the project partners is ex-EU but is committed to the projects objectives
b) Besides the named WP leaders other laboratories are involved in the research these are: NMIA, VNIIOFI, KRISS, NIST and NIM (Australia, Russia, South Korea, USA and China)