Analysis of D-shaped optical fiber based corrosion sensor using LMR and SPR effects

被引：0

作者：

da Silva Júnior V.M. ^{[1
]}

Nascimento J.F. ^{[2
]}

Martins Filho J.F. ^{[1
]}

机构：

[1] Department of Electronics and Systems, Federal University of Pernambuco, Recife

[2] Interdisciplinary Nucleus of Nature and Exact Sciences, Federal University of Pernambuco, Caruaru

来源：

Journal of Microwaves, Optoelectronics and Electromagnetic Applications | 2021年 / 20卷 / 03期

关键词：

Cascaded structure; Corrosion sensor; D-shaped optical fiber sensor; Lossy mode resonance; Surface plasmon resonance;

D O I：

10.1590/2179-10742021V20I3254063

中图分类号：

学科分类号：

摘要：

This article presents the proposed structure and the simulation results from analytical and numerical modeling of two corrosion sensor elements in D-shaped optical fiber: one based on the lossy mode resonance (LMR) effect and the other based on the effect of surface plasmon resonance (SPR). In the first sensor element, a bilayer of titanium dioxide - aluminum (TiO2-Al) is deposited on the D-shaped region, operating in LMR conditions, while, in the second sensor element, an aluminum(Al) monolayer is deposited under D-shaped region, operating in SPR condition. The sensor elements can operate separately, enabling simultaneous two-parameter measurements at two different points, or they can operate in cascade configuration, increasing the operating range and sensitivity of the sensor set. The D-shaped region of the optical fiber is modeled with an analytical model based on the Fresnel formulation, and also with a numerical model, which uses the finite element method with the COMSOL Multiphysics 5.2 software. The transmission of light through the D-shaped region causes peculiar variations in each light polarization in each sensor element, depending on the metal thickness. Both regions are subject to a corrosive environment. The sensor elements are evaluated separately and in cascade configuration, using polarized and non-polarized light. Finally, the obtained results show two resonance valleys for the same operating wavelength, resulting in a higher operating range with high sensitivity, compared to other corrosion sensor structures found in the literature. © 2021 SBMO/SBMag

引用

页码：585 / 599

页数：14

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