Preparation And Experimental Research Of Sensitive Film In Optical Fiber Hydrogen Sensor

Hydrogen is a kind of flammable and explosive gas under normal temperature and pressureconditions. When the leakage of hydrogen is between4.0%~74.5%in the air, it may causean explosion which threatens the personal safety. In order to ensure the safety in the processof hydrogen’s manufacturing, storage, transport and using, it is significant to research for asafe, reliable, sensitive hydrogen sensor. Because fiber optic hydrogen sensors have manyadvantages that conventional sensors not have, like intrinsic safety, corrosion resistance,anti-electromagnetic interference, they have broad prospects. This article mainly analyzesand realizes reflective optical fiber bundle hydrogen sensor system, selects palladium-yttriumalloy to improve the preparation technology of hydrogen sensitive film, and makes someexperiments to verify the feasibility and effectiveness of the system.First, this article analyzes the research status of the optical fiber hydrogen sensor at homeand abroad, and then adopts the probe which is made of fiber bundle without any microfabrication on the optical fiber. In order to improve the sensor’s stability and precision, thisarticle makes double light path to compensate the drift, designs photoelectric sensorhardware, uses LabVIEW to collect and process signal, and construct the standard gas testplatform for experimental study.Second, in order to overcome “hydrogen brittleness” of the pure palladium film, in thisarticle we use the palladium-yttrium alloy and self-assembled monolayers to enhance thestability of the sensor. The hydrogen sensitive membrane is prepared using the double-targetsmagnetron sputtering.Finally, the satisfied sensitivity and stability of the sensor is proved by experiments; theenhancement effects of the palladium-yttrium alloy and self-assembled monolayers are studied.The last chapter reviews current problems in this study, and points out problems that need to be solvedin next work.