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Distributed type non-slippage optical fiber strain sensor and manufacturing method thereof

A fiber optic strain and sensor technology, which is applied in the direction of instruments, optical devices, and optical testing of defects/defects, can solve the problems that the test results cannot accurately reflect the actual strain distribution of the structure, the internal slip of the optical fiber, etc., and achieve the elimination of internal slip, Easy on-site installation and stable performance

Active Publication Date: 2011-11-02
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Technical problem: The previous experimental results show that the existing commercial optical fibers have internal slippage problems, resulting in test results that cannot accurately reflect the actual strain distribution of the structure. Aiming at the shortcomings of existing optical fiber products, the present invention provides a distributed non-slip optical fiber fabric The Liouin scattering strain sensor and its manufacturing method realize the accurate monitoring of long-distance and large-scale strain distribution of structures in the health monitoring process, as well as the local damage diagnosis of large structures such as crack monitoring of concrete structures, reinforcement corrosion and overall performance evaluation of structures, And solve the sensor installation cheapness, stability and durability problems

Method used

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  • Distributed type non-slippage optical fiber strain sensor and manufacturing method thereof
  • Distributed type non-slippage optical fiber strain sensor and manufacturing method thereof
  • Distributed type non-slippage optical fiber strain sensor and manufacturing method thereof

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Embodiment 1

[0069] Embodiment 1 fully bonded optical fiber strain sensor

[0070] The single-mode optical fiber used in the strain sensor of this embodiment is a sheet with a width of 1.5-6mm and a thickness of 0.5mm-1mm, or a wire with a diameter of 1-2mm. In this embodiment, due to the price advantage of basalt fiber, especially the linear expansion coefficient of basalt fiber is close to that of concrete, the long-term test performance is stable, and it is more suitable for monitoring the long-term state of concrete structure, so basalt fiber is selected as the packaging material. The structure of the sensor is that the bare optical fiber 1 is covered by the basalt fiber encapsulation layer 7 to form protection for the bare optical fiber 1, and the encapsulated optical fiber sensor is divided into a test section and a connection section. In the test section, the bare optical fiber 1 with the coating layer stripped off is used. The bare optical fiber and the basalt fiber are infiltrated...

Embodiment 2

[0079] Embodiment 2 Internal fixed-point fiber optic sensor

[0080] The single-mode optical fiber used in the optical fiber strain sensor of this embodiment is a sheet with a width of 1.5-6mm and a thickness of 0.5mm-1mm, or a wire with a diameter of 1-2mm. The package adopts basalt fiber, and the structure of the strain sensor is that the single-mode optical fiber 4 is pierced with multiple sleeves 6, and the sleeves 6 are arranged at a certain distance, and the bare optical fiber 1 and the sleeves 6 between the sleeves are bonded with epoxy resin 3 On the impregnated basalt bundle 7, the sleeve 6 not only protects the single-mode optical fiber 4, but also ensures the free deformation of the single-mode optical fiber 4 in the sleeve 6, so that the gauge length between two bonding points can be tested The average strain within the range changes the distributed optical fiber into a plurality of continuous long-gauge-length strain sensors 41, which are also relatively convenien...

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Abstract

A distributed no-slippage optical fiber stain sensor and a manufacturing method thereof are a distributed no-slippage Brillouin scattering optical fiber which is used for the health detection and monitoring of the structural facility and the manufacturing method thereof. The invention is characterized in that the sensor uses an UV resin signle mode fiber as a substrate, and a single mode bare fiber part which is eliminated with an UV resin coating layer is provided thereon. The exterior part of the bare fiber is provided with a basalt fiber packaging layer to form an optical fiber strain sensor. To the total adhibition packaging mode, the exterior part is immersed with epoxy resin and is packaged. To the fixed-point adhibition packaging optical fiber, a sleeve pipe is provided outside thebare optical fiber. A certain space is preserved between the sleeve pipes. The bare fiber between the sleeve pipes and the sleeve pipes are fixed on the immersed basalt fiber through the epoxy resin.The distributed no-slippage optical fiber sensor of the invention has high precision and high sensitivity. The long-distance and large-area structural stain information can be accurately obtained, and the manufacturing method is simple and easy.

Description

technical field [0001] The invention relates to a distributed non-slip optical fiber strain sensor for health detection and monitoring of structural facilities and a manufacturing method thereof, belonging to the technical field of optical fiber strain sensor manufacturing. Background technique [0002] In the structural health monitoring system, sensors and their testing systems are the foundation and play a pivotal role. Stress (strain)-based monitoring, on the one hand, is far from meeting the needs of long-term structural monitoring in terms of stability and durability of the corresponding sensors. , on the other hand, traditional "point" strain gauges often fail due to local stress concentration and cracks, and it is not practical to distribute them on large civil structures, but if the local damage in the structure does not appear in the test range of the installed sensors It is difficult to be detected accurately, so that the unpredictable structural damage cannot be ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/88G01B11/16
Inventor 吴智深张浩
Owner SOUTHEAST UNIV
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