An invar-based fabry-perot cavity refractometer with a gallium fixed-point cell for assessment of pressure

Authors

  • I. Silander Department of Physics Umea University SE-901 87 Umea
  • C. Forssén Department of Physics Umea University SE-901 87 Umea and Measurement Technology RISE Research Institutes of Sweden SE-501 15 Boras
  • J. Zakrisson Department of Physics Umea University SE-901 87 Umea
  • M. Zelan Measurement Technology RISE Research Institutes of Sweden SE-501 15 Boras
  • O. Axner Department of Physics Umea University SE-901 87 Umea

DOI:

https://doi.org/10.21014/acta_imeko.v9i5.987

Abstract

An Invar-based Fabry-Perot cavity refractometer equipped with an automated, miniaturized gallium fixed-point cell for assessment of pressure is presented. The use of an Invar cavity spacer has previously demonstrated pressure assessments with sub-0.1 ppm precision. The fixed-point cell, whose design and implementation are presented here, provides a reference for temperature assessment of the gas inside the cavity with an uncertainty of 4 ppm. This opens up for a self-contained system for realization of the Pascal with an accuracy in the low ppm range. This is an important step towards disseminating the Pascal through fundamental principles.

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Published

2020-12-31

Issue

Vol. 9 No. 5 (2020): Special issue for TC3, TC5, TC16 and TC22

Section

Conference Submissions

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