Research On High Response Optical Fiber Hydrogen Sensor Enhanced With Nanoparticles

The colorless, odorless and high flame hydrogen gas is widely used in many fields, therefore, it is of great value and significant to develop a hydrogen sensor with high security. The traditional semiconductor hydrogen sensor has made a great contribution to the industry, however it cannot be used on some occasion because of its complex structure and that it may lead to explosion when it is applied the voltage. The optional fiber sensor which detects optical signal has unparalleled advantages over other types of sensors, such as intrinsic safety, resistance to electromagnetic interference, small volume, corrosion resistance, light in weight etc. Therefore, the optional fiber sensor is a good choice for the hydrogen gas detection and has a wide applicate prospect.The research of the optional fiber hydrogen sensor includes lots of different research directions, such as the research of sensing mechanism, signal detection method of the optical fiber sensor, design of the structure of the sensor, preparation of the hydrogen sensitive film, signal processing methods of the sensor etc. In this paper, the hydrogen adsorption process and the model of the nanoparticles is researched and a novel optional fiber hydrogen sensor which is made by palladium-based material has been developed.Based on the existing experiment platform, the intensity distribution of the fiber end is studied and the model of the optical fiber probe's reflection intensity is built on the strength of the distribution, meanwhile, this paper also discuss the influence of the parameters in the system on the reflected light intensity. According to the structure of the existing optical fiber probe, the reflection model is established and the structure of the probe is optimized by using MATLABPure palladium and palladium silver nanoparticles were prepared by liquid phase synthesis method and deposited by spin coating on the substrate. Thin film surface morphology, composition and crystalline state were studied by using a variety of characterization methods. Response performance of the pure palladium and palladium silver based nanoparticles were tested and analyzed with different concentration, the experimental results show that the hydrogen gas sensor based on nanoparticles has a better performance than the sensor based palladium yttrium alloy film, thus, the liquid phase synthesis of nanoparticles can be used for the reflective type fiber hydrogen sensor.