Abstract
A fiber optical sensor has been developed by coating proton conducting perovskite oxide (Sr(Ce<sub>0.8</sub>Zr<sub>0.1</sub>)Y<sub>0.1</sub>O<sub>2.95</sub>, SCZY) thin film on the long-period fiber grating (LPFG) for high temperature <i>in situ</i> measurement of bulk hydrogen in gas mixtures relevant to the fossil- and biomass-derived syngas. In this paper, we investigate in the H<sub>2</sub>-sensing mechanism of the SCZY-LPFG sensor. The high temperature H<sub>2</sub> adsorbance in the SCZY, the SCZY electric conductivity in H<sub>2</sub>, and the resonant wavelength shift of the SCZY-LPFG (Δλ<sub>R,H2</sub>) have been experimentally studied to understand the effect of operation temperature on the sensor's sensitivity to H<sub>2</sub>. Because of the activation process of the H<sub>2</sub> reaction with the perovskite oxide, increasing temperature benefits the H<sub>2</sub> uptake in the SCZY phase and the sensitivity of the SCZY-LPFG sensor. However, the thermal stability of the LPFG and the microstructure of the SCZY nanocrystalline film limit the application temperature of the fiber optic sensor.
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