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Article

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

by 1,2,* and 3
1
School of Aerospace, Transport, and Manufacturing, Cranfield University, Cranfield MK43 0AL, UK
2
School of Optoelectronic Engineering, Qilu University of Technology, Jinan 250353, China
3
Aston Institute of Photonic Technology, Aston University, Birmingham B4 7ET, UK
*
Author to whom correspondence should be addressed.
Photonics 2021, 8(6), 180; https://doi.org/10.3390/photonics8060180
Received: 11 May 2021 / Revised: 19 May 2021 / Accepted: 21 May 2021 / Published: 23 May 2021
(This article belongs to the Special Issue Advancements in Fiber Bragg Grating Research)
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. View Full-Text
Keywords: fiber Bragg gratings; polymer optical fiber; thermo-optic effect; refractive index humidity dependence fiber Bragg gratings; polymer optical fiber; thermo-optic effect; refractive index humidity dependence
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MDPI and ACS Style

Zhang, W.; Webb, D.J. Performances of PMMA-Based Optical Fiber Bragg Grating Sensor in Extended Temperature Range. Photonics 2021, 8, 180. https://doi.org/10.3390/photonics8060180

AMA Style

Zhang W, Webb DJ. Performances of PMMA-Based Optical Fiber Bragg Grating Sensor in Extended Temperature Range. Photonics. 2021; 8(6):180. https://doi.org/10.3390/photonics8060180

Chicago/Turabian Style

Zhang, Wei, and David J. Webb 2021. "Performances of PMMA-Based Optical Fiber Bragg Grating Sensor in Extended Temperature Range" Photonics 8, no. 6: 180. https://doi.org/10.3390/photonics8060180

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