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  • 1.
    Forssen, Clayton
    et al.
    Umeå University, Sweden.
    Silander, Isak
    Umeå University, Sweden.
    Szabo, David
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Jönsson, Gustav
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Bjerling, Martin
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Hausmaninger, Thomas
    VTT, Finland.
    Axner, Ove
    Umeå University, Sweden.
    Zelan, Martin
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    A TRANSPORTABLE REFRACTOMETER FOR ASSESSMENT OF PRESSURE IN THE KPA RANGE WITH PPM LEVEL PRECISION2020In: Acta IMEKO, ISSN 2221-870X, Vol. 9, no 5, p. 287-292Article in journal (Refereed)
    Abstract [en]

    A transportable refractometer for assessment of kPa pressures with ppm level precision is presented. It is based on the GAs MOdulation Refractometry (GAMOR) methodology, making it resistant to fluctuations and drifts. At the National Metrology Institute at RISE, Sweden, the system assessed pressures in the 4.3 - 8.7 kPa range with sub-ppm precision (0.5 - 0.9 ppm). The system was thereafter disassembled, packed, and transported 1040 km to Umeå University, where it, after unpacking and reassembling, demonstrated a similar precision (0.8 - 2.1ppm). This shows that the system can be disassembled, packed, transported, unpacked, and reassembled with virtually unchanged performance. 

  • 2.
    Forssén, Clayton
    et al.
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology. Umeå University, Sweden.
    Silander, Isak
    Umeå University, Sweden.
    Zakrisson, Johan
    Umeå University, Sweden.
    Amer, Eynas
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Szabo, David
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Bock, Thomas
    PTB Physikalisch-Technische Bundesanstalt, Germany.
    Kussike, Andre
    PTB Physikalisch-Technische Bundesanstalt, Germany.
    Rubin, Tom
    PTB Physikalisch-Technische Bundesanstalt, Germany.
    Mari, Domenico
    INRiM Istituto Nazionale di Ricerca Metrologica, Italy.
    Pasqualin, Stefano
    INRiM Istituto Nazionale di Ricerca Metrologica, Italy.
    Silvestri, Zaccaria
    Conservatoire National des Arts et Métiers Laboratoire Commun de Métrologie, France.
    Bentouati, Djilali
    LNE Laboratoire National de Métrologie et d’Essais, France.
    Axner, Ove
    Umeå University, Sweden.
    Zelan, Martin
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Demonstration of a Transportable Fabry–Pérot Refractometer by a Ring-Type Comparison of Dead-Weight Pressure Balances at Four European National Metrology Institutes2023In: Sensors, E-ISSN 1424-8220, Vol. 24, no 1, article id 7Article in journal (Refereed)
    Abstract [en]

    Fabry–Pérot-based refractometry has demonstrated the ability to assess gas pressure with high accuracy and has been prophesized to be able to realize the SI unit for pressure, the pascal, based on quantum calculations of the molar polarizabilities of gases. So far, the technology has mostly been limited to well-controlled laboratories. However, recently, an easy-to-use transportable refractometer has been constructed. Although its performance has previously been assessed under well-controlled laboratory conditions, to assess its ability to serve as an actually transportable system, a ring-type comparison addressing various well-characterized pressure balances in the 10–90 kPa range at several European national metrology institutes is presented in this work. It was found that the transportable refractometer is capable of being transported and swiftly set up to be operational with retained performance in a variety of environments. The system could also verify that the pressure balances used within the ring-type comparison agree with each other. These results constitute an important step toward broadening the application areas of FP-based refractometry technology and bringing it within reach of various types of stakeholders, not least within industry.

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