Fiber optic relative humidity sensor based on the tilted fiber Bragg grating coated with graphene oxide

A fiber optic relative humidity (RH) sensor based on the tilted fiber Bragg grating (TFBG) coated with graphene oxide (GO) film was presented. Amplitudes of the cladding mode resonances of the TFGB varies with the water sorption and desorption processes of the GO film, because of the strong interact...

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Bibliographic Details
Published in:Applied physics letters 2016-07, Vol.109 (3)
Main Authors: Wang, Youqing, Shen, Changyu, Lou, Weimin, Shentu, Fengying, Zhong, Chuan, Dong, Xinyong, Tong, Limin
Format: Article
Language:English
Subjects:
Applied physics
Cladding
Correlation coefficients
Fiber optics
Graphene
Humidity
Optical fibers
Propagation modes
Relative humidity
Sensors
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Summary:A fiber optic relative humidity (RH) sensor based on the tilted fiber Bragg grating (TFBG) coated with graphene oxide (GO) film was presented. Amplitudes of the cladding mode resonances of the TFGB varies with the water sorption and desorption processes of the GO film, because of the strong interactions between the excited backward propagating cladding modes and the GO film. By detecting the transmission intensity changes of the cladding mode resonant dips at the wavelength of 1557 nm, the maximum sensitivity of 0.129 dB/%RH with a linear correlation coefficient of 99% under the RH range of 10–80% was obtained. The Bragg mode of TFBG can be used as power or wavelength references, since it is inherently insensitive to RH changes. In addition, the proposed humidity sensor shows a good performance in repeatability and stability.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4959092