FBG hydrogen sensor based on Pt-WO3

Prepared a nanoscale hydrogen-sensitive material, uniformly coated it onto a fiber Bragg grating, and fabricated a fiber Bragg grating hydrogen sensor. SEM characterization reveals that the Pt-WO₃ composite nanoparticles are unevenly distributed on the surface of the grating, resulting in a loose and porous structure. The performance test shows that the sensor has a detection sensitivity of 0.095 pm/ppm in the range of 0-3.01 % hydrogen concentration, the response time is 28.5 seconds, and it has good linearity. When exposed to different concentrations of interfering gases of CO₂, C₂H₄, and CH₄, the sensor exhibits good gas selectivity and anti-interference performance.