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.

Publication DOI: https://doi.org/10.3390/photonics8060180
Divisions: College of Engineering & Physical Sciences > School of Informatics and Digital Engineering > Electrical and Electronic Engineering
College of Engineering & Physical Sciences > Aston Institute of Urban Technology and the Environment (ASTUTE)
College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
College of Engineering & Physical Sciences
Additional Information: 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.
Uncontrolled Keywords: fiber Bragg gratings,polymer optical fiber,thermo-optic effect,refractive index humidity dependence
Full Text Link:
Related URLs: https://www.mdp ... 04-6732/8/6/180 (Publisher URL)
PURE Output Type: Article
Published Date: 2021-05-23
Accepted Date: 2021-05-21
Authors: Zhang, Wei
Webb, David J. (ORCID Profile 0000-0002-5495-1296)

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