Bridge displacement monitoring system based on optical fiber sensors

Abstract

The invention provides a bridge displacement monitoring system based on optical fiber sensors. The bridge displacement monitoring system comprises at least one fiber grating strain sensor group, a fiber grating demodulating instrument and a monitoring host. The fiber grating strain sensor group is fixed on monitoring points of a bridge and used for monitoring transverse deformation, longitudinal deformation and vertical deformation of the bridge. The fiber grating demodulating instrument is connected with the fiber grating strain sensor group through transmission optical fibers. Detecting light emitted from a light source inside the fiber grating demodulating instrument shoots into all fiber grating displacement sensors in a monitoring area. The fiber grating demodulating instrument is used for demodulating wavelength sensing signals generated by the fiber grating strain sensor group. The monitoring host is used for receiving demodulation data of the fiber grating demodulating instrument through a communication network and analyzing the displacement state and the health status of the bridge based on the demodulation data. Through adoption of the fiber grating sensing technology and utilization of communication optical fibers and cables to transmit the sensing signals, the bridge displacement monitoring system based on the optical fiber sensors has the advantages of being strong in anti-interference capacity, high in sensitivity, good in stability, free from power supply in a monitoring field, and capable of achieving displacement state monitoring of the long-distance bridge, and the like.

Description

technical field [0001] The invention relates to the field of safety and health monitoring of infrastructure structures, in particular to a bridge displacement monitoring system based on fiber grating sensing technology. Background technique [0002] With the rapid development of the economy, the construction of basic civil engineering facilities in my country has ushered in a peak period that is rarely seen in history, showing that "reconstruction does not focus on maintenance", and it is also increasingly exposing multi-level, complicated and decentralized social public security risks and major problems. Accident risks have caused huge losses to people's lives, property and social resources. The national government regulatory departments have started to gradually improve the corresponding standards and regulations to restrict the development of the transportation facility safety industry, and regularly check the potential safety hazards of the provincial and municipal regula...

AI Technical Summary

Problems solved by technology

Because the construction of railways and highway bridges is generally far away from towns, traditional monitoring methods are very difficult in terms of power supply, and high-speed rail lines that stretch for hundreds of kilometers require a large number of monitoring sensors and form a sensor network. There are no successful application cases for monitoring

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