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Optical measurement of the gas number density in a Fabry–Perot cavity
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.ORCID iD: 0000-0001-9068-6031
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.ORCID iD: 0000-0003-4349-500x
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2013 (English)In: Meas. Sci. Technol., Vol. 24, p. art nr 105207-Article in journal (Other academic) Published
Abstract [en]

An optical method for measuring the gas density by monitoring the refractive index inside a high-finesse Fabry–Perot cavity is presented. The frequency of a narrow linewidth Er:fiber laser, locked to a mode of the cavity, is measured with the help of an optical frequency comb while the gas density inside the cavity changes. A resolution of 1.4 × 10-6 mol m-3 is achieved in 3 s for nitrogen, which allows measurement of a relative gas density change of 3.4 × 10-8 at atmospheric pressure.

Place, publisher, year, edition, pages
2013. Vol. 24, p. art nr 105207-
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Natural Sciences
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URN: urn:nbn:se:ri:diva-6489Local ID: 15778OAI: oai:DiVA.org:ri-6489DiVA, id: diva2:964327
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2018-08-13Bibliographically approved

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Zelan, MartinPendrill, Leslie

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