Long-Period Grating Relative Humidity Sensor With Hydrogel Coating

The long-period grating (LPG) coated with the hydrogel was investigated for monitoring the relative humidity (RH) levels-the ratio of the amount of water vapor in the air at a specific temperature to the maximum amount that the air could hold at that temperature. The experimental results showed that...

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Bibliographic Details
Published in:IEEE photonics technology letters 2007-06, Vol.19 (12), p.880-882
Main Authors: Liu, Yang, Wang, Liwei, Zhang, Min, Tu, Dongsheng, Mao, Xianhui, Liao, Yanbiao
Format: Article
Language:English
Subjects:
Chemical sensors
Coatings
Equations
Gratings
Humidity
Hydrogel
Hydrogels
Linearity
long-period grating (LPG)
LPG
Monitoring
optical fiber sensors
Optical sensors
Photonics
Refractive index
Relative humidity
relative humidity (RH)
Resonance
Sensors
Temperature sensors
Wavelength measurement
Wavelengths
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Summary:The long-period grating (LPG) coated with the hydrogel was investigated for monitoring the relative humidity (RH) levels-the ratio of the amount of water vapor in the air at a specific temperature to the maximum amount that the air could hold at that temperature. The experimental results showed that the resonant wavelength of the hydrogel-coated LPG was shifted when the RH varied from 38.9% to 100%, with a linearity of 99.5% and an accuracy of plusmn2.3% RH
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2007.897551