A Simple Equation to Describe Cross-Sensitivity Between Temperature and Refractive Index in Fiber Bragg Gratings Refractometers

In this paper, we propose a simple nonlinear equation to describe the cross-sensitivity between temperature and refractive index in fiber Bragg grating refractometers. A numerical analysis using Comsol Multiphysics software was performed to understand how the effective index changes with the tempera...

Full description

Saved in:
Bibliographic Details
Published in:IEEE sensors journal 2018-02, Vol.18 (3), p.1104-1110
Main Authors: Fernandes, Diego, Carvalho Barreto, Rafael, Gerniski Macedo, Andreia, Cardozo Da Silva, Jean Carlos, Canute Kamikawachi, Ricardo
Format: Article
Language:English
Subjects:
Bragg gratings
Computer simulation
cross-sensitivity
Fiber Bragg grating
Fiber gratings
Mathematical model
Nonlinear equations
Nonlinear response
Numerical analysis
optical fiber sensor
Refractive index
Refractivity
Refractometers
Sensitivity
temperature
Temperature measurement
Temperature sensors
Wavelengths
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this paper, we propose a simple nonlinear equation to describe the cross-sensitivity between temperature and refractive index in fiber Bragg grating refractometers. A numerical analysis using Comsol Multiphysics software was performed to understand how the effective index changes with the temperature and refractive index. The sensor response to refractive index (from 1.33 to 1.45) and temperature (from 15 °C to 45 °C) was fitted using a surface equation. Even though the refractive index range considered being significantly large, and the sensor response being nonlinear, proper concordance between computer simulations and experiments point out that this multivariable equation is suitable to describe the Bragg wavelengths as a function of temperature and refractive index. When applied to multimode fiber Bragg gratings, the proposed equation can be used to construct a system of equations to calculate temperature and refractive index from the measured Bragg wavelengths.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2017.2784681