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Lookup NU author(s): Dr Andrew Pike
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
A microfiber interferometer based on a single-mode tapered-no-core single-mode (STNCS) fiber structure coated with a thin layer of graphene oxide (GO) was proposed and demonstrated as a relative humidity (RH) sensor. The STNCS fiber structure has a strong evanescent field, which can sensitively response to changes in the surrounding refractive index. The moisture-sensitive material GO was used to form the film on the no-core fiber by a dip impregnation method. The effects of GO concentration and the tapered waist diameter on RH sensitivity were studied experimentally. The experimental results showed that a thinner waist diameter provides higher RH sensitivity. When the concentration of GO solution is 0.01 mg/mL, the STNCS fiber structure with a waist diameter of 2.9 μm performs better in RH sensing; a high sensitivity of 0.461 nm/%RH in the range of 40-98% was achieved. The sensor has good stability with wavelength fluctuations of ±0.009 nm and ±0.008 nm over 60 mins at RHs of 50% and 80%, respectively. The proposed fiber optic humidity sensor has a high sensitivity over a wide measurement range and offers good stability showing promising potential application in the field of RH sensing.
Author(s): Yang H, Lie J, Liu B, Luo C, Yi Z, Ma L, Wan S, Pike AR, Fu YQ, Wu Q, He X
Publication type: Article
Publication status: Published
Journal: IEEE Access
Year: 2020
Volume: 8
Pages: 220755 - 220761
Print publication date: 07/12/2020
Online publication date: 07/12/2020
Acceptance date: 07/12/2020
Date deposited: 05/11/2021
ISSN (electronic): 2169-3536
Publisher: IEEE
URL: https://doi.org/10.1109/ACCESS.2020.3041507
DOI: 10.1109/ACCESS.2020.3041507
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