A low detection limit fiber optic gas sensor

By deploying PDMS/MOF gradient composite films in the waist region of tapered optical fibers and combining the dispersion inflection point mechanism, the problems of insufficient sensitivity and uneven MOF growth in optical fiber sensors were solved, achieving gas detection with low detection limits, improving the sensitivity and stability of the sensor, and reducing costs.

CN116698793BActive Publication Date: 2026-06-30WUHAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WUHAN UNIV OF TECH
Filing Date
2023-05-23
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing fiber optic sensors lack sufficient sensitivity in the detection of gases with low detection limits, and the difficulty in uniformly growing MOF materials on the surface of tapered optical fibers leads to sensor failure, which restricts the development of MOF and fiber optic sensor integration.

Method used

A PDMS/MOF gradient composite film is deployed in the waist region of a tapered optical fiber. By combining the gradient design of MOF with the light transmittance and gas permeability of PDMS, and the sensitization mechanism of the dispersion inflection point of the tapered optical fiber, the sensitivity of the sensor is improved and the cost is reduced.

Benefits of technology

It achieves gas detection with low detection limit, improves the sensitivity and stability of the sensor, solves the problem of optical signal attenuation when MOF is directly used as the outer cladding of optical fiber, and reduces manufacturing cost.

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Abstract

This invention discloses a low detection limit fiber optic gas sensor, comprising an input single-mode fiber, a tapered fiber, and an output single-mode fiber. A PDMS / MOF gradient composite film is uniformly distributed in the waist region of the tapered fiber. In the PDMS / MOF gradient composite film, the MOF doping gradient decreases from the outer surface towards the waist region. This sensor, by distributing the PDMS / MOF gradient composite film in the tapered region, leverages the excellent gas adsorption capacity of MOF, the light transmittance and gas permeability of PDMS, and the gradient design of MOF doping to further improve sensor sensitivity and reduce manufacturing costs. Combined with the sensitization mechanism of the dispersion inflection point of the tapered fiber structure, it achieves low detection limit gas detection. Furthermore, the fabrication method is simple and inexpensive.
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