Bare fiber grating sensor packaging structure and packaging method

Abstract

The invention discloses a bare fiber grating sensor packaging structure and packaging method. The packaging structure comprises a base body, a fiber grating, an isolation cover and a bonding layer. A coating layer at the bonding part of the fiber grating is stripped, and the fiber grating is fixed on the base body after being pre-tensioned; the isolation cover is fixed on the base body and shields and covers the grating region of the fiber grating; and the bonding layer is bonded on the base body, the bonding layer wraps the stripped part of the fiber grating and the isolation cover, and the isolation cover isolates the grating region of the fiber grating from the bonding layer. According to the bare fiber grating sensor packaging structure and the packaging method, the chirp phenomenon is avoided, and the bare fiber grating sensor packaging structure and the packaging method are suitable for large strain measurement. The sensor is good in durability, stability, linearity, repeatability and consistency; the adhesion between an adhesive and a fiber core is reliable, and the sensor is particularly suitable for strain measurement by pasting the bare fiber grating on a slender component only bearing the action of axial force.

Description

technical field [0001] The invention relates to the technical field of intelligent cables, in particular to a package structure and a package method of a bare fiber grating sensor. Background technique [0002] Stay cables, main cables and suspenders are the main stress-bearing components of cable-bearing bridge structures. They are under high-stress cyclic fatigue loads for a long time. Their cross-sectional dimensions are small and they are very sensitive to corrosion. Once there is disease and deterioration due to the lack of durability and safety of the stay cables or slings, the loss of the bridge's bearing capacity will lead to a vicious accident of collapse, resulting in bad social impact and huge economic losses. In order to ensure the safe operation of the bridge, it is necessary to carry out preventive maintenance and safety inspection on the stay cables, main cables and suspension cables of the cable-bearing bridge. [0003] Smart cable technology is a new techno...

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Problems solved by technology

[0005] Based on this, it is necessary to provide a bare fiber grating sensor packaging structure and packaging method for the uneven thickness of the adhesive layer, as well as the shrinkage and deformation of materials and colloids, the fiber grating sensor feels non-uniform strain, and affects the test accuracy.

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