Abstract
We describe a fiber optic humidity sensor comprising a moisture - sensitive overlay on a long period fiber grating (LPFG), tuned at the 1.5 microns band. The hygrosensitive material overlaid was poly(ethylene oxide)/CoCl 2 hybrid containing 10 % wt CoCl 2 in the form of micro- and nano-particles synthesized in situ in the polymer of 50000 molecular weight. A thin overlay of the material is deposited from an aqueous solution on the unclad region of the LPFG and upon exposure to different ambient humidity levels its spectral properties are modified. The experimental results obtained, show changes of the spectral resonance notch and the transmission strength of the LPFG. The material parameters associated with the sensing mechanism may include those of refractive index, absorption and morphological alterations of the overlaid material. Relative humidity (RH) variations in the range from 50% to 95% can been detected with a resolution better than 0.2% RH. The response time constant is found of the order of few hundred milliseconds.
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