Brillouin distributed optical fiber sensing based structural joint monitoring device

Abstract

A Brillouin distributed optical fiber sensing based structural joint monitoring device is characterized by comprising steel plate bases (9), a linear steel sheet (5) and an L-shaped steel sheet (8) are mounted on each steel plate base (9), a pulley (6) is mounted at each of a suspension arm end of each linear steel sheet (5) and a corner end of each L-shaped steel sheet (8), an optical fiber (1) for stretching detection is wound on the two corresponding pulleys (6) at the suspension arm ends of the linear steel sheets (5) on two sides of a structural joint, an optical fiber (2) for contracting detection is wound on the two corresponding pulleys (6) at the corner ends of the L-shaped steel sheets (8) on two sides of the structural joint, an optical fiber (3) for temperature compensation detection is connected between the optical fiber (1) for stretching detection and the optical fiber (2) for contracting detection, and each of the optical fiber (1) for stretching detection and the optical fiber (2) for contracting detection is connected with a Brillouin distributed optical fiber demodulating system through a respective connecting optical fiber (4). The Brillouin distributed optical fiber sensing based structural joint monitoring device is capable of monitoring the stretching quantity and the closing quantity of the structural joint, achieves temperature self compensation and effectively overcomes the shortcomings when the optical fibers are simply laid.

Description

technical field [0001] The invention relates to an engineering detection technology, in particular to a device for detecting expansion and contraction of structural joints using an optical fiber sensor, in particular to a monitoring device for structural joints based on Brillouin distributed optical fiber sensing. Background technique [0002] Structural joints are some artificial joints set at the joints of components in engineering structural facilities, such as expansion joints of bridges, patchwork joints of tunnel segments, etc. At these structural joints, due to factors such as temperature and component offset, the joint width will change, and when the limit value is reached, the joints will fail, and even catastrophic accidents such as falling beams of bridges will occur. Therefore, it is of great significance to implement long-term online monitoring of these structures. However, due to the astonishing number of structural seams, it is generally difficult to deploy ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing Brillouin distributed optical fiber sensing device can only perform one-way detection, and design a sensor based Structural Seam Monitoring Device Based on Brillouin Distributed Optical Fiber Sensing

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