A fiber optic sensor based on air-gap long period gratings for pH sensing application

In this article, a pH fiber‐optic sensor based on an air‐gap long period fiber grating (AG‐LPG) in a multi‐modes fiber is proposed. Owing to the different pH solutions to cause the index variation of surrounding AG‐LPG, the grating wavelength will be shifted due to the change of the effective index...

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Bibliographic Details
Published in:Microwave and optical technology letters 2013-04, Vol.55 (4), p.855-857
Main Authors: Mau, Jiang-Chiou, Lin, Guei-Ru, Fu, Ming-Yue, Liu, Wen-Fung
Format: Article
Language:English
Subjects:
air-gap long period fiber grating (AG-LPG)
Detection
Diffraction gratings
fiber etching
Fiber optics
fiber side-polishing
Fibers
Gratings (spectra)
micro-lithography
Optical fibers
pH sensor
Silver
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Summary:In this article, a pH fiber‐optic sensor based on an air‐gap long period fiber grating (AG‐LPG) in a multi‐modes fiber is proposed. Owing to the different pH solutions to cause the index variation of surrounding AG‐LPG, the grating wavelength will be shifted due to the change of the effective index both in core and cladding layers. For pH sensing applications, the experimental results show the sensitivity of −0.219 nm/pH and 0.248 nm/pH for measuring the acid and alkaline solutions respectively. This simple sensing head can be applied in a real‐time and long‐term monitoring pH change of drinking water or testing solutions. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:855–857, 2013; View this article online at wileyonlinelibrary.com. DOI: 10.1002/mop.27466
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.27466