Hydrogen performance of fiber Bragg grating hydrogen sensors using Pt-loaded WO3coating as sensing materials

A novel method was proposed to improve hydrogen sensitive performance of fiber Bragg grating (FBG) hydrogen sensor. The hydrogen performance of the sensor can be greatly improved by combing Pt/WO3 composite film annealed under 315°C for 1 h and temperature sensitive FBG. At room temperature of 25°C, FBG coated with Pt/WO3 composite film has 536 pm wavelength shift towards 10000 ppm hydrogen, and hydrogen detection threshold of FBG hydrogen sensor can reach to 200 ppm. The hydrogen performance of FBG hydrogen sensor was studied under different humidity, and ambient humidity has little effect on the hydrogen performance of FBG hydrogen sensor.