Long-Period Fiber Grating Based on Side-Polished Optical Fiber and Its Sensing Application

Li, Hou-Chang, Liu, Juan, He, Xing-Dao, Yuan, Jinhui, Wu, Qiang and Liu, Bin (2022) Long-Period Fiber Grating Based on Side-Polished Optical Fiber and Its Sensing Application. IEEE Transactions on Instrumentation and Measurement, 72. p. 7001109. ISSN 0018-9456

1.final version TIM-22-04834R1 to IEEE TIM.pdf - Accepted Version

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Official URL: https://doi.org/10.1109/TIM.2023.3234094


A novel side-polished long-period fiber grating (LPFG) sensor was proposed and experimentally validated. Side-polished can provide a stronger evanescent field than traditional grating and bring superior sensitivity. The greater the side-polished depth, the higher the refractive index (RI) sensitivity. When d = 44,μm , the RI sensitivity reached 466.85 nm/RIU in the range of 1.3330-1.3580, which is fourfold higher than the LPFG prepared by the electric-arc discharge (EAD) method. A graphene oxide (GO) nano-film is coated on the LPFG to make it realize high sensitivity relative humidity (RH) sensing. Humidity sensitivity reached -0.193 nm/%RH in the range of 40%-80% RH. In addition, side-polished breaks the symmetry of the distribution of the cross-sectional light field, which determines the ability to achieve vector curvature measurement. It shows good sensing performance in the same/opposite bending direction as the side polished surface. When the input light polarization is 90°, the average sensitivity reaches 5.03 and -5.9 nmm-1 in the range of 0-19.67 m-1 , respectively. This strongly indicates that the fabricated sensors show high sensitivity, low-cost materials, and robust performance and break the limitations of the EDA method to prepare gratings, which have good application potential for biomedicine and the field of construction.

Item Type: Article
Additional Information: Funding Information: This work was supported in part by the National Natural Science Foundation of China (NSFC) under Grant 11864025, Grant 62175097, Grant 62065013, and Grant 62163029; and in part by the Natural Science Foundation of Jiangxi Province under Grant 20212BAB202024 and Grant 20192ACB20031.
Uncontrolled Keywords: Long-period fiber grating (LPFG), relative humidity (RH) sensing, side-polished, vector curvature sensing
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 15 Feb 2023 10:40
Last Modified: 15 Feb 2023 10:45
URI: https://nrl.northumbria.ac.uk/id/eprint/51406

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