Fiber integrated hydrogen sensor and manufacturing method thereof

Abstract

The invention provides a fiber integrated hydrogen sensor and a manufacturing method thereof. The hydrogen sensor comprises a light source 1, a single-mode optical fiber 2, an optical circulator 3, adouble-core optical fiber 5, a hydrogen sensitive film 6, a reflecting film 7 and a spectrum analyzer 8 which are connected in sequence. The hydrogen sensitive film covers the D-type optical fiber formed by polishing and grinding the dual-core optical fiber, and the interferometer is formed by performing fused biconical taper on a welding spot of the single-mode optical fiber and the dual-core optical fiber and manufacturing a reflecting film on the end face. After the hydrogen sensitive film 6 absorbs hydrogen, the volume is severely expanded, axial strain is generated, the hydrogen sensitivefilm covers the polishing and grinding area, so that the double-core optical fiber is bent, and the two fiber cores generate optical path difference, so that an interference spectrum drifts. And thehydrogen concentration change can be measured by monitoring the interference spectrum. The invention has the advantages of simple structure, high integration level, easy preparation and the like.

Description

[0001] (1) Technical field [0002] The invention relates to a fiber-integrated hydrogen sensor and a manufacturing method thereof, in particular to a fiber-integrated hydrogen sensor based on a double-core optical fiber, which belongs to the technical field of optical fiber sensing. [0003] (2) Background technology [0004] Hydrogen is a clean and reusable energy that is widely used in various fields such as the automobile industry, aerospace, and chemical processing. Due to the high diffusivity, low ignition point and wide explosion range of hydrogen, hydrogen is easy to leak and cause explosion. It can be seen that the research and development of materialized hydrogen sensing technology is the primary condition for the study of hydrogen energy, the utilization of hydrogen energy and the prevention of hydrogen hazards. The sensor signal of the traditional electrochemical sensor is an electrical signal, which has the potential danger of igniting hydrogen and it is difficult...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that the optical fiber needs to be micro-processed, and the cost of making a microcavity on the optical fiber is high, and the device is fragile, which is not conducive to preservation.

Patent CN208505893 U proposes a Mach-Zehnder interference hydrogen sensor based on photonic crystal fiber, filling the air hole of photonic crystal fiber with a refractive index matching liquid, and using the hydrogen sensitive film to absorb the characteristics of hydrogen temperature change to monitor the hydrogen concentration , the hydrogen sensor made by this method is easily affected by the external temperature, and it is difficult to accurately monitor the hydrogen concentration

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