External fixation homogenized strain sensing optical cable

Abstract

The invention relates to an external fixation homogenized strain sensing optical cable comprising a single-mode optical fiber (1) of a core part, and 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 sheath layer (4) is arranged outside the armor layer (3); a plurality ofglue filling areas (5) are arranged at intervals along the length direction of the optical cable; the sheath layer (4) is stripped from the peripheries of the glue filling areas (5),adhesives are usedfor outward filling from the tight cladding layer (2); the armor layer (3) is filled and embedded and the sheath layer (4) is extruded outwards; a pair of arc-shaped cover plates (6) is arranged on the outer sides of the glue filling areas to completely cover the glue filling areas (5) and is bonded with the glue filling areas (5) through overflowing adhesives. According to the invention, the clamp is fixed on the surface of a monitoring structure body, and the arc-shaped cover plates and the armor layer can enable the pressure stress applied by the clamp not to be transmitted to or to be transmitted to a small part of the optical fiber below the glue filling areas, thereby avoiding the interference of the pressure stress of an external fixed clamp.

Description

technical field [0001] The invention relates to an externally fixed sensing optical cable, which belongs to the field of optical fiber sensing. Background technique [0002] With the increasing maturity of optical fiber sensing technology, optical fiber sensing monitoring system has been widely used in tunnels, mine engineering, bridge cables, water conservancy and hydropower and other fields. Distributed optical fiber sensing technology uses the sensing optical cable as the sensing sensitive element and signal transmission medium, combined with different signal demodulation equipment, can detect the strain, temperature, vibration and other physical quantity information of the field along the sensing optical cable laying, and realize long-distance , Large-scale real-time online measurement and monitoring have become application hotspots. [0003] When the distributed optical fiber strain sensing system is used for structural health monitoring, the strain sensing optical cab...

AI Technical Summary

Problems solved by technology

The way the clamp is fixed on the surface of the structure will cause the compressive stress concentration of the strain sensing optical cable at the fixed position of the clamp, which will cause the distortion of the monitoring data near the fixed position of the clamp and affect the accuracy of the monitoring results; or the reinforcement of the optical cable The tensile strength is too high, so that the stress of the structure acting on the optical cable through the clamp is large enough to make the optical cable and the structure deform together, and the excessive stress will make the clamp not tight, resulting in data distortion and other phenomena

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