| In modern society, the need of energy and the awareness of environmentalconservation have becoming stronger and stronger, so hydrogen energy has greatapplication advantage as a clean energy. Hydrogen gas has the risk of explosion in thecase of leakage for it is inflammable and explosive. Optical fiber F-P hydrogen sensorhas many advantages, such as intrinsic preventing explosion, anti-electromagneticinterference, small volume and so on. So it is more suitable than electronic sensor forhydrogen gas concentration detection.According to the advantages of fiber optic sensor in terms of detecting hydrogengas concentration, we did some research on an optical fiber F-P hydrogen sensorbased on pulsed laser deposition sensitive film. The main contents are as follows:1. This dissertation introduced four type hydrogen sensors, elaborated thecharacter of each type of sensor and the unique advantages of optical sensor forhydrogen detection as well as compared different coating technologies, thenillustrated the advantages of fiber optic sensor coating based on pulsed laserdeposition technology.2. Sensor structure parameters were obtained by discussion for structure and thebasic principle of diaphragm type optical fiber F-P sensor.3. In this dissertation, we researched a method of low temperature deposition forPd/Ag alloy film by pulsed laser, characterized and analyzed crystal structure,microstructure and surface morphology of the film. Finally, we preliminarily obtainedoptimizing process parameters for Pd/Ag alloy film deposition on optical fiber basedon pulsed laser deposition.4. In this dissertation, we obtained Pd/Ag alloy film on fiber end with a specialfixture, designed and prepared an optical fiber sensing structure, which can limit theexpansive direction of the hydrogen sensitive film in order to change cavity length ofF-P sensor. Preliminary test showed that the sensor can be used to monitor changes ofhydrogen gas concentration. |
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