Optical measurement of the gas number density in a Fabry-Perot cavity
2013 (English)In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 24, no 10, 105207- p.Article in journal (Refereed) Published
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 x 10(-6) mol m(-3) is achieved in 3 s for nitrogen, which allows measurement of a relative gas density change of 3.4 x 10(-8) at atmospheric pressure.
Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2013. Vol. 24, no 10, 105207- p.
laser refractometry, gas density measurement, metrology, optical frequency comb, Fabry-Perot cavity
IdentifiersURN: urn:nbn:se:umu:diva-82812DOI: 10.1088/0957-0233/24/10/105207ISI: 000324621900031OAI: oai:DiVA.org:umu-82812DiVA: diva2:663448
FunderSwedish Research Council, 621-2011-5123, 621-2012-3650