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Long-Period Grating Relative Humidity Sensor With Hydrogel Coating

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6 Author(s)
Yang Liu ; Dept. of Appl. Math., Tsinghua Univ., Beijing ; Liwei Wang ; Min Zhang ; Dongsheng Tu
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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

Published in:

Photonics Technology Letters, IEEE  (Volume:19 ,  Issue: 12 )