{"id":1142,"date":"2023-02-06T14:11:05","date_gmt":"2023-02-06T13:11:05","guid":{"rendered":"https:\/\/au.feri.um.si\/leoss\/?p=1142"},"modified":"2023-06-06T14:13:35","modified_gmt":"2023-06-06T12:13:35","slug":"a-fiber-optic-gas-sensor-and-method-for-the-measurement-of-refractive-index-dispersion-in-nir","status":"publish","type":"post","link":"https:\/\/au.feri.um.si\/leoss\/en\/a-fiber-optic-gas-sensor-and-method-for-the-measurement-of-refractive-index-dispersion-in-nir\/","title":{"rendered":"A fiber-optic gas sensor and method for the measurement of refractive index dispersion in NIR"},"content":{"rendered":"<p>This paper presents a method for gas concentration determination based on the measurement of the refractive index dispersion of a gas near the gas resonance in the near-infrared region (NIR). The gas refractive index dispersion line shape is reconstructed from the variation in the spectral interference fringes\u2019 periods, which are generated by a low-finesse Fabry-Perot interferometer during the DFB diode\u2019s linear-over-time optical frequency sweep around the gas resonance frequency. The entire sensing system was modeled and then verified experimentally, for an example of a low concentration methane-air mixture. We demonstrate experimentally a refractive index dispersion measurement resolution of 2 \u00d7 10<sup>\u22129<\/sup> refractive index units (RIU), which corresponds to a change in methane concentration in air of 0.04 vol% at the resonant frequency of 181.285 THz (1653.7 nm). The experimental and modeling results show an excellent agreement. The presented system utilizes a very simple optical design and has good potential for the realization of cost-efficient gas sensors that can be operated remotely through standard telecom optical fibers.<\/p>\n\n\n\n<p><em>Sensors<\/em><strong>2020<\/strong>, <em>20<\/em>(13), 3717; <a href=\"https:\/\/doi.org\/10.3390\/s20133717\">https:\/\/doi.org\/10.3390\/s20133717<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>This paper presents a method for gas concentration determination based on the measurement of the refractive index dispersion of a gas near the gas resonance in the near-infrared region (NIR). The gas refractive index dispersion line shape is reconstructed from <a href=\"https:\/\/au.feri.um.si\/leoss\/en\/a-fiber-optic-gas-sensor-and-method-for-the-measurement-of-refractive-index-dispersion-in-nir\/\" class=\"read-more\">Read More &#8230;<\/a><\/p>","protected":false},"author":7,"featured_media":1143,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[23,13,15,11,34],"tags":[],"_links":{"self":[{"href":"https:\/\/au.feri.um.si\/leoss\/en\/wp-json\/wp\/v2\/posts\/1142"}],"collection":[{"href":"https:\/\/au.feri.um.si\/leoss\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/au.feri.um.si\/leoss\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/au.feri.um.si\/leoss\/en\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/au.feri.um.si\/leoss\/en\/wp-json\/wp\/v2\/comments?post=1142"}],"version-history":[{"count":1,"href":"https:\/\/au.feri.um.si\/leoss\/en\/wp-json\/wp\/v2\/posts\/1142\/revisions"}],"predecessor-version":[{"id":1146,"href":"https:\/\/au.feri.um.si\/leoss\/en\/wp-json\/wp\/v2\/posts\/1142\/revisions\/1146"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/au.feri.um.si\/leoss\/en\/wp-json\/wp\/v2\/media\/1143"}],"wp:attachment":[{"href":"https:\/\/au.feri.um.si\/leoss\/en\/wp-json\/wp\/v2\/media?parent=1142"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/au.feri.um.si\/leoss\/en\/wp-json\/wp\/v2\/categories?post=1142"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/au.feri.um.si\/leoss\/en\/wp-json\/wp\/v2\/tags?post=1142"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}