Graphene-enhanced tilted fiber grating leaky-mode resonant sensor and its detection system

Abstract

The invention belongs to the technical field of optical fiber sensing, and in particular relates to a graphene-enhanced tilted fiber grating leakage mode resonant sensor with excellent characteristics such as high sensitivity, high measurement accuracy, and fast response speed for small changes in low-refractive-index objects to be measured and its detection. A system comprising a light source, a polarization controller, a sample cell to be tested, a tilted fiber grating, and a spectrum analyzer, wherein the tilted fiber grating includes a core and a cladding, and the core region is written with a tilt angle of 6 to 10° The cladding surface of the inclined grating area is coated with graphene, and the two ends of the graphene are coated with metal film electrodes. By changing the voltage on the metal electrode, the photoelectric properties of graphene can be dynamically adjusted, thereby enhancing the leaky mode resonance of the tilted fiber Bragg grating. The leaky mode resonance has better sensing characteristics than the existing resonance technology, especially for low refractive index regions. The leakage mode resonance exhibits higher sensing sensitivity and sensing accuracy for detecting small changes in substances.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a graphene-enhanced tilted fiber grating leakage mode resonant sensor and a detection system thereof. Background technique [0002] In recent years, tilted fiber grating sensors have been widely researched and applied, and have many excellent features, such as small size, label-free, high sensitivity, multi-parameter detection, remote distributed sensing, etc., in biochemical medicine, environmental monitoring, pollutant detection and other fields have important application prospects. [0003] Typical fiber grating sensors include fiber Bragg gratings, long-period fiber gratings, and tilted fiber gratings. Generally, LPFG sensors based on the principle of forward core guided mode and cladding mode coupling have the highest sensing sensitivity. However, because almost all external disturbances, such as temperature, strain, refractive index, concentratio...

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Problems solved by technology

However, the sensing sensitivity of the above methods is low when the substance to be detected undergoes small changes, especially in the low refractive index region

Although effective sensing information can be obtained by introducing other complex signal demodulation methods, the complexity and detection time of the sensing device are increased, and the sensing stability is affected to a certain extent, which is not conducive to the practical application and maintenance of the sensing device.

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