Optical fiber hydrogen sensor sensitized by multilayer nanoparticle film

Abstract

The invention provides a multi-layer nano particle film sensitized optical fiber hydrogen sensor, which includes a gas chamber; glass substrate arrays arranged in parallel and equidistant; a hydrogen sensitive nano particle film coated on each glass substrate; sending optical fiber and receiving The optical fiber is arranged at both ends of the gas chamber, so that after the light emitted by the sending fiber is collimated by the lens, it penetrates all the hydrogen-sensing nanoparticle films along the alignment direction of the glass substrate, and then is coupled into the receiving fiber. In the present invention, hydrogen-sensing elements or alloys are made into nano-particle films, plated on the substrate, and arranged in layers, effectively utilizing the advantages of fast hydrogen-sensing speed of nanoparticles and small interface stress with the substrate material; and achieving sensor enhancement through multi-layer transmission. Sensitive effect makes up for the shortcomings of poor scattering effect of a small amount of nanoparticles, thereby eliminating the irreconcilable contradictions in the response speed, sensitivity and reliability of the original thin-film optical fiber hydrogen sensor, and comprehensively improving the performance of the sensor.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to an optical fiber hydrogen sensor with multi-layer nano particle film sensitization. Background technique [0002] Hydrogen sensors play an important role in hydrogen concentration detection and leakage monitoring, and are the basis for ensuring the safety of major projects. At present, there are many types of hydrogen sensors, most of which use palladium or palladium alloy materials as sensitive substances, mainly because palladium has good selectivity to hydrogen. The hydrogen concentration can be detected by using the volume change, resistance change or refractive index change after the chemical reaction between palladium or palladium alloy material and hydrogen. The earliest developed electrical hydrogen sensors have played an extremely important role in various fields, but electrical gas sensors are very likely to generate electric sparks and explode when they are us...

AI Technical Summary

Problems solved by technology

There are only preliminary experimental reports on the optical fiber plasma sensing structure, but the sensor needs to be finely processed on the optical fiber during production, which is very inconvenient and difficult to control its sensitive size.

If the sensitive film (palladium or palladium alloy film) material in the existing reflective, transmissive, interferometric, fiber grating, and micromirror fiber sensor structures is directly replaced with nanoparticle materials, it is difficult to detect signal changes.

The reason is mainly because the size of the nanoparticle material is too small, and the effect of a single (or a small amount) nanodot or nanowire on the light wave is very weak.

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