Multilayer nanoparticle film sensitized optical fiber hydrogen sensor

Abstract

The invention provides a multilayer nanoparticle film sensitized optical fiber hydrogen sensor which comprises an air chamber, glass substrate arrays arranged in equal distance parallel to one another, hydrogen-sensitive nanoparticle films plated on each glass substrate, and a transmitting optical fiber and a receiving optical fiber arranged at two ends of the air chamber, so that light emitted by the transmitting optical fiber is collimated by a lens, penetrates through all the hydrogen-sensitive nanoparticle films along the arrangement direction of the glass substrate arrays and is coupled to enter the receiving optical fiber. According to the sensor disclosed by the invention, hydrogen-sensitive elements or alloys are manufactured into nanoparticle films to be plated on the substrates and laminated, and the advantages that the nanoparticles are high in hydrogen-sensitive speed and low in interfacial stress with substrate materials are achieved. Moreover, according to the multilayer transmission effect, the sensor sensitization effect is achieved, and the defect that a small amount of nanoparticles are bad in scattering effect is overcome, so that the contradiction that the response speed, sensitivity, reliability and other aspects of an original thin-film type optical fiber hydrogen sensor are irreconcilable is eliminated, and the performance of the sensor is comprehensively improved.

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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