Embedded homogenized strain sensing optical cable

Abstract

The invention relates to an embedded homogenized strain sensing optical cable comprising a single-mode optical fiber (1) of a core part. A tight cladding layer (2) is formed outside the single-mode optical fiber (1) through extrusion molding; an armor layer (3) is arranged outside the tight cladding layer (2); a plurality of glue filling areas (4) are arranged at intervals along the length direction of the optical cable, each glue filling area (4) is filled with an adhesive from the outside of the tight cladding layer (2) to the armor layer (3), i.e., the armor layer (3) is embedded and fixedon the surface of the tight cladding layer (2) through the adhesive in each glue filling area, and a plurality of reinforcements (5) are arranged outside the armor layer and a sheath layer (6) is extruded. The optical cable sheath layer senses strain information of a monitoring structure body and then transmits the strain information to the internal single-mode optical fiber in the glue filling areas, and when encountering local large strain, on the one hand, the optical cable can counteract a part of stress through deformation in the structure to protect the optical cable, and on the other hand, the signal intensity of the glue filling area is amplified to realize sensing sensitivity. Thus, local large strain range sensing can be adapted.

Description

technical field [0001] The invention relates to a strain sensing optical cable and belongs to the field of optical fiber sensing. Background technique [0002] In recent years, with the construction of large-scale facilities, such as bridges, tunnels, railways, oil and gas pipelines, water conservancy and hydropower projects, etc., monitoring the force of the facility structure during the construction or operation of the facility is very necessary to prevent major accidents in the facility. Therefore, the structural health monitoring of large-scale infrastructure has been paid more and more attention by construction parties and users. [0003] Distributed optical fiber sensing technology has become a hot spot for monitoring applications because it can realize long-distance and large-scale real-time online sensing. [0004] When the distributed optical fiber strain sensing system is used for structural health monitoring, the strain sensing optical cables are usually laid in ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the current embedded strain sensing optical cable, which is low in strength and not suitable for large strains, and provide a strain sensing optical cable that is resistant to pressure and adapts to the local large strain of the monitoring structure.

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