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Invar-based refractometer for pressure assessments
Umeå University, Sweden.
RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology. Umeå University, Sweden.
Umeå University, Sweden.
RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.ORCID iD: 0000-0001-9068-6031
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2020 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 45, no 9, p. 2652-2655Article in journal (Refereed) Published
Abstract [en]

Gas modulation refractometry (GAMOR) is a methodology that can mitigate fluctuations and drifts in refractometry. This can open up for the use of non-conventional cavity spacer materials. In this paper, we report a dual-cavity system based on Invar that shows better precision for assessment of pressure than a similar system based on Zerodur. This refractometer shows for empty cavity measurements, up to 104 s, a white noise response (for N2) of 3 mPa s1=2. At 4303 Pa, the system has a minimum Allan deviation of 0.34 mPa (0.08 ppm) and a long-term stability (24 h) of 0.7 mPa. This shows that the GAMOR methodology allows for the use of alternative cavity materials.

Place, publisher, year, edition, pages
OSA - The Optical Society , 2020. Vol. 45, no 9, p. 2652-2655
Keywords [en]
Refractometers, Allan deviation, Cavity materials, Dual cavity, Long term stability, Refractometry, Spacer materials, Zerodur, White noise
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-44996DOI: 10.1364/OL.391708Scopus ID: 2-s2.0-85084432828OAI: oai:DiVA.org:ri-44996DiVA, id: diva2:1433233
Available from: 2020-05-29 Created: 2020-05-29 Last updated: 2023-05-25Bibliographically approved

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Zelan, Martin

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