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一种用于测量近红外区域折射率色散的光纤气体传感器及方法。

A Fiber-Optic Gas Sensor and Method for the Measurement of Refractive Index Dispersion in NIR.

作者信息

Njegovec Matej, Donlagic Denis

机构信息

Laboratory for Electro Optics and Sensor Systems, Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroska cesta 46, 2000 Maribor, Slovenia.

出版信息

Sensors (Basel). 2020 Jul 2;20(13):3717. doi: 10.3390/s20133717.

DOI:10.3390/s20133717
PMID:32630837
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7374323/
Abstract

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 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.

摘要

本文提出了一种基于测量近红外区域（NIR）气体共振附近气体折射率色散来确定气体浓度的方法。气体折射率色散线形由光谱干涉条纹周期的变化重建，这些条纹是由低精细度法布里 - 珀罗干涉仪在分布反馈（DFB）二极管围绕气体共振频率进行线性随时间光学频率扫描期间产生的。以低浓度甲烷 - 空气混合物为例，对整个传感系统进行了建模，然后通过实验进行了验证。我们通过实验证明了折射率色散测量分辨率为2×10折射率单位（RIU），这对应于在181.285太赫兹（1653.7纳米）共振频率下空气中甲烷浓度变化0.04体积％。实验和建模结果显示出极好的一致性。所提出的系统采用非常简单的光学设计，具有实现可通过标准电信光纤远程操作的经济高效气体传感器的良好潜力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/82a1/7374323/1a17dea37960/sensors-20-03717-g016.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/82a1/7374323/131ccfa89056/sensors-20-03717-g012.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/82a1/7374323/1a17dea37960/sensors-20-03717-g016.jpg

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