Relative Humidity Sensor Based on Cascaded Long-Period Gratings With Hydrogel Coatings and Fourier Demodulation

A Mach-Zehnder interferometer based on cascaded long-period gratings with a hydrogel thin-film coating is developed for monitoring the relative humidity (RH). The visibility of fringes and phase shift of the fringes are measured using Fourier analysis. The sensors show good linearity using the visib...

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Bibliographic Details
Published in:IEEE photonics technology letters 2009-12, Vol.21 (24), p.1828-1830
Main Authors: Xiujuan Yu, Childs, P., Min Zhang, Yanbiao Liao, Jian Ju, Wei Jin
Format: Article
Language:English
Subjects:
Cascaded long-period gratings (LPGs)
Coatings
Demodulation
Electromagnetic interference
Fiber gratings
Fourier analysis
Humidity
hydrogel
Hydrogels
Optical attenuators
Optical fiber sensors
Optical fibers
Optical interferometry
Optical sensors
Phase shift
Relative humidity
relative humidity (RH)
Sensors
Visibility
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Summary:A Mach-Zehnder interferometer based on cascaded long-period gratings with a hydrogel thin-film coating is developed for monitoring the relative humidity (RH). The visibility of fringes and phase shift of the fringes are measured using Fourier analysis. The sensors show good linearity using the visibility of fringes from 60%RH to 100%RH with the ability to measure below 60% at reduced accuracy using the phase shift. An RH accuracy of 0.4% is achieved.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2009.2034620