Multi-Wavelength Fiber Bragg Grating Hydrogen Sensing Based on Hydrogen-Induced Thermal Effect of Pt/WO3

To achieve high-sensitivity and intrinsically safe monitoring of hydrogen energy systems, a multi-wavelength fiber Bragg grating sensor based on the hydrogen-induced exothermic effect of Pt/WO3 nanomaterials was designed. This structure takes advantage of the catalytic effect of Pt on hydrogen molecules to trigger a thermal effect in a hydrogen environment, resulting in a redshift in the grating’s reflected wavelength. Experiments show that the sensor has a good linear response (R2 > 0.98) within a hydrogen concentration range of 0.5% to 3.5%, with stable and repeatable response and recovery processes. The multi-channel fiber structure enables synchronous detection of different central wavelengths, significantly enhancing the system’s scalability and distributed measurement capabilities. The research results indicate that this method has potential application value in hydrogen energy safety monitoring and intelligent sensor networks.