High temperature fixed points for future temperature scale

Project Description

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).

Further Information

[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)

Thermometry (T)
Coordinating Institute
NPL (United Kingdom)
Further Partners
NMIJ, Japan