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A potential technique for fully distributed fiber-optic hydrogen sensing is demonstrated based on a traveling long-period grating (LPG) in a single-mode fiber coated with a platinum (Pt) catalyst layer. The traveling LPG is generated by an acoustic pulse propagating along the fiber. The Pt-coated fiber section is heated by the thermal energy released from Pt-assisted combustion of H2 and O2. The resulted...
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