Optical measurements of pressure around an atmospheric pressure

Purpose and goal

Within the project, we have developed and demonstrated measurement methods for measuring gas-pressure at atmospheric pressure by means of measurement of changes in refractive index. Specifically, the refractometry system has been modified to handle atmospheric pressure, and have also been made transportable. A stability of 1 ppm has been achieved. However, the accuracy of the system has not been confirmed due to limitations in temperature measurement. Two articles have been published in open-access peer-review journals and the results have also been presented at a conference.

Expected results and effects

In addition to the direct project goals that have been met, the project has also further strengthened the National Metrology Institute of Sweden its position in the field. It has also strengthened the collaboration with the Swedish Academia, in this case Umeå Universitet. The project has also been a major contributor to the hire of a a joint PhD student together with Umeå Universitet, as well as the participation in the EU project QuantumPascal that started this year.

Planned approach and implementation

Overall, the project has been implemented without major problems and changes. In particular, the work during the second part could be carried out in a very effective way as project manager had a significantly increased physical presence at Umeå Universitet thanks to permanent placement in Norrland in RISE premises in Örnsköldsvik and Umeå.