An optical fiber hydrogen sensor with Pd/Ag film

A20 nanometer palladium-silver （Pd/Ag） ultra-thin film was used for hydrogen gas sensing. The atomic ratio of Pd： Ag was 3：1, the thin film was evaporated on the optical glass, the Pd/Ag alloy could increase the life and provide the stability of the sensing film. The artificial neutral network was used for processing the data collected from the optical fiber bundle hydrogen sensor, which could enhance the measuring accuracy, at the same time, the intrinsic and extrinsic influences were eliminated mainly. Experimental results and numerical simulation show the training method available, a linear precision of 0. 1% for the optical hydrogen sensor is achieved.