Fiber-optic humidity sensor based on an air-gap long period fiber grating

In this paper, we propose a novel high-sensitivity fiber-optic humidity sensor based on a calcium chloride thin film to be coated on an air-gap long-period grating fabricated (AG-LPG) by combining the fiber side-polishing and fiber etching methods. When the surrounding refractive index of the air-ga...

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Bibliographic Details
Published in:Optical review (Tokyo, Japan) Japan), 2011-01, Vol.18 (1), p.93-95
Main Authors: Fu, Ming-Yue, Lin, Guei-Ru, Liu, Wen-Fung, Wu, ChengWen
Format: Article
Language:English
Subjects:
Atomic
Lasers
Microwaves
Molecular
Optical and Plasma Physics
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Quantum Optics
Regular Papers
RF and Optical Engineering
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Summary:In this paper, we propose a novel high-sensitivity fiber-optic humidity sensor based on a calcium chloride thin film to be coated on an air-gap long-period grating fabricated (AG-LPG) by combining the fiber side-polishing and fiber etching methods. When the surrounding refractive index of the air-gap long-period grating is changed by a change in humidity, the grating resonant wavelength is considered varied. Experimental results indicate that humidity can be detected by this sensing mechanism and has a high sensitivity of about 1.36 nm/1%RH.
ISSN:1340-6000
1349-9432
DOI:10.1007/s10043-011-0038-7