A fiber-optic Fabry-Perot hydrogen sensor was developed by measuring the fringe contrast\nchanges at different hydrogen concentrations. The experimental results indicated that the sensing\nperformance with the Pd-Y film was better than that with the Pd film. A fringe contrast with a\ndecrease of 0.5 dB was detected with a hydrogen concentration change from 0% to 5.5%. The\ntemperature response of the sensor was also measured.
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