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9 November 2010 Polymer-coated hybrid fiber grating for relative humidity sensing
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A relative humidity (RH) sensor based on a hybrid fiber grating coated with a moisture sensitive polymer is proposed in this paper. The hybrid fiber grating includes a normal fiber Bragg grating (FBG) and a tilted FBG (TFBG), which are superimposed around the same position of the fiber. The FBG reflects a part of the cladding modes of the TFBG and its intensity changes with the refractive index of the moisture sensitive polymer, which varies when absorbing and desorbing moisture. The optical power interrogation method is simper and more cost-efficient than normal FBG-based relative humidity sensors using wavelength detection method.
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Tao Li, Xinyong Dong, Chun-Liu Zhao, and Yang Liu "Polymer-coated hybrid fiber grating for relative humidity sensing", Proc. SPIE 7853, Advanced Sensor Systems and Applications IV, 78532V (9 November 2010);

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