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A Fiber-Optic Gas Sensor and Method for the Measurement of Refractive Index Dispersion in NIR
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 interfere...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7374323/ https://www.ncbi.nlm.nih.gov/pubmed/32630837 http://dx.doi.org/10.3390/s20133717 |
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author | Njegovec, Matej Donlagic, Denis |
author_facet | Njegovec, Matej Donlagic, Denis |
author_sort | Njegovec, Matej |
collection | PubMed |
description | 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’ periods, which are generated by a low-finesse Fabry-Perot interferometer during the DFB diode’s 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 × 10(−9) 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. |
format | Online Article Text |
id | pubmed-7374323 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-73743232020-08-06 A Fiber-Optic Gas Sensor and Method for the Measurement of Refractive Index Dispersion in NIR Njegovec, Matej Donlagic, Denis Sensors (Basel) Article 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’ periods, which are generated by a low-finesse Fabry-Perot interferometer during the DFB diode’s 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 × 10(−9) 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. MDPI 2020-07-02 /pmc/articles/PMC7374323/ /pubmed/32630837 http://dx.doi.org/10.3390/s20133717 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Njegovec, Matej Donlagic, Denis A Fiber-Optic Gas Sensor and Method for the Measurement of Refractive Index Dispersion in NIR |
title | A Fiber-Optic Gas Sensor and Method for the Measurement of Refractive Index Dispersion in NIR |
title_full | A Fiber-Optic Gas Sensor and Method for the Measurement of Refractive Index Dispersion in NIR |
title_fullStr | A Fiber-Optic Gas Sensor and Method for the Measurement of Refractive Index Dispersion in NIR |
title_full_unstemmed | A Fiber-Optic Gas Sensor and Method for the Measurement of Refractive Index Dispersion in NIR |
title_short | A Fiber-Optic Gas Sensor and Method for the Measurement of Refractive Index Dispersion in NIR |
title_sort | fiber-optic gas sensor and method for the measurement of refractive index dispersion in nir |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7374323/ https://www.ncbi.nlm.nih.gov/pubmed/32630837 http://dx.doi.org/10.3390/s20133717 |
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