Performances of PMMA-Based Optical Fiber Bragg Grating Sensor in Extended Temperature Range

Wei Zhang; David J. Webb

doi:10.3390/photonics8060180

Performances of PMMA-Based Optical Fiber Bragg Grating Sensor in Extended Temperature Range

Wei Zhang^*, David J. Webb

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

PMMA based optical fiber Bragg grating (POFBG) sensors are investigated in an environmental chamber with controlled temperature and relative humidity at temperature extended to 70 °C. At below a critical temperature of 50 °C the POFBG sensor exhibits good linearity and sensitivity for both temperature and humidity sensing. Nonlinear responses are observed at higher temperature, giving rise to varying, reduced magnitudes of sensitivities. An important feature of POFBG humidity sensing is observed at above critical temperature where the POFBG humidity sensitivity turns from positive to negative. A theoretical model based on Lorentz–Lorenz equation is presented to estimate the dependence of POFBG refractive index on temperature and relative humidity. The experimental results qualitatively agree with the theoretical analyses.

Original language	English
Article number	180
Journal	Photonics
Volume	8
Issue number	6
DOIs	https://doi.org/10.3390/photonics8060180
Publication status	Published - 23 May 2021

Bibliographical note

Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Keywords

fiber Bragg gratings
polymer optical fiber
thermo-optic effect
refractive index humidity dependence

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Cite this

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title = "Performances of PMMA-Based Optical Fiber Bragg Grating Sensor in Extended Temperature Range",

abstract = "PMMA based optical fiber Bragg grating (POFBG) sensors are investigated in an environmental chamber with controlled temperature and relative humidity at temperature extended to 70 °C. At below a critical temperature of 50 °C the POFBG sensor exhibits good linearity and sensitivity for both temperature and humidity sensing. Nonlinear responses are observed at higher temperature, giving rise to varying, reduced magnitudes of sensitivities. An important feature of POFBG humidity sensing is observed at above critical temperature where the POFBG humidity sensitivity turns from positive to negative. A theoretical model based on Lorentz–Lorenz equation is presented to estimate the dependence of POFBG refractive index on temperature and relative humidity. The experimental results qualitatively agree with the theoretical analyses.",

keywords = "fiber Bragg gratings, polymer optical fiber, thermo-optic effect, refractive index humidity dependence",

author = "Wei Zhang and Webb, {David J.}",

note = "Copyright: {\textcopyright} 2021 by the authors. Licensee MDPI, Basel, Switzerland. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.",

year = "2021",

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T1 - Performances of PMMA-Based Optical Fiber Bragg Grating Sensor in Extended Temperature Range

AU - Zhang, Wei

AU - Webb, David J.

N1 - Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

PY - 2021/5/23

Y1 - 2021/5/23

N2 - PMMA based optical fiber Bragg grating (POFBG) sensors are investigated in an environmental chamber with controlled temperature and relative humidity at temperature extended to 70 °C. At below a critical temperature of 50 °C the POFBG sensor exhibits good linearity and sensitivity for both temperature and humidity sensing. Nonlinear responses are observed at higher temperature, giving rise to varying, reduced magnitudes of sensitivities. An important feature of POFBG humidity sensing is observed at above critical temperature where the POFBG humidity sensitivity turns from positive to negative. A theoretical model based on Lorentz–Lorenz equation is presented to estimate the dependence of POFBG refractive index on temperature and relative humidity. The experimental results qualitatively agree with the theoretical analyses.

AB - PMMA based optical fiber Bragg grating (POFBG) sensors are investigated in an environmental chamber with controlled temperature and relative humidity at temperature extended to 70 °C. At below a critical temperature of 50 °C the POFBG sensor exhibits good linearity and sensitivity for both temperature and humidity sensing. Nonlinear responses are observed at higher temperature, giving rise to varying, reduced magnitudes of sensitivities. An important feature of POFBG humidity sensing is observed at above critical temperature where the POFBG humidity sensitivity turns from positive to negative. A theoretical model based on Lorentz–Lorenz equation is presented to estimate the dependence of POFBG refractive index on temperature and relative humidity. The experimental results qualitatively agree with the theoretical analyses.

KW - fiber Bragg gratings

KW - polymer optical fiber

KW - thermo-optic effect

KW - refractive index humidity dependence

UR - https://www.mdpi.com/2304-6732/8/6/180

U2 - 10.3390/photonics8060180

DO - 10.3390/photonics8060180

M3 - Article

SN - 2304-6732

VL - 8

JO - Photonics

JF - Photonics

IS - 6

M1 - 180

ER -

Performances of PMMA-Based Optical Fiber Bragg Grating Sensor in Extended Temperature Range

Abstract

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Keywords

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