| Project description |
| Temperature is one of the most often measured physical quantities. Recent advances in primary thermometry has made the time ripe for a redefinition of the SI unit for temperature, the kelvin, by fixing the value of the Boltzmann constant (expected in 2018). This will enable primary thermometers to be built that do not have to compromise performance by operating well at both the triple point of water and at the temperature of interest. Instead, instruments can be designed that are dedicated for extremely accurate measurements at certain temperature intervals. It is the objective of this work to build such dedicated thermometers for extremely accurate measurements at selected temperatures. This will contribute to the current practice of thermometry using fixed point cells by lowering uncertainties, it will provide consistency checks to the defined value of the Boltzmann constant, and it will be a step in the direction of primary thermometry without fixed points and interpolation. |