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An optical fiber hydrogen sensor with single Sagnac interferometer loop based on vernier effect has been proposed. The vernier effect is achieved by angle shift splicing two polarization maintaining fibers (PMFs) in single Sagnac interferometer loop. The hydrogen sensing length of PMF is 2cm which is coated with Pt-loaded WO3/SiO2 powder. When the Pt/WO3 film is exposed to hydrogen, the redox reaction...
A novel optical fiber temperature sensor with single sagnac loop based on vernier effect has been proposed. The sensitivity of the sensor enhances obviously based on vernier effect. The experimental temperature sensitivity is −2.147 nm/O which is 13.17 times higher than that of the single sagnac sensor without vernier effect. This sensor has a simple structure and can be applied widely.
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