Title :
Long-Period Grating Relative Humidity Sensor With Hydrogel Coating
Author :
Liu, Yang ; Wang, Liwei ; Zhang, Min ; Tu, Dongsheng ; Mao, Xianhui ; Liao, Yanbiao
Author_Institution :
Dept. of Appl. Math., Tsinghua Univ., Beijing
fDate :
6/15/2007 12:00:00 AM
Abstract :
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
Keywords :
diffraction gratings; fibre optic sensors; humidity measurement; humidity sensors; optical fibres; hydrogel coating; long-period grating; relative humidity sensor; Chemical sensors; Coatings; Equations; Gratings; Humidity; Optical sensors; Refractive index; Resonance; Temperature sensors; Wavelength measurement; Hydrogel; long-period grating (LPG); optical fiber sensors; relative humidity (RH);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.897551
