Metro settlement monitoring system based on distributed optical fiber strain sensing

Abstract

The invention relates to a metro settlement monitoring system based on distributed optical fiber strain sensing. The system comprises a distributed optical fiber strain analyzer, a sensing optical fiber, a settlement meter, an air communicating tube, a liquid level communicating tube and a liquid storage tank. The distributed optical fiber strain analyzer and the sensing optical fiber form a sensing testing light path to monitor the optical fiber strain and temperature of each part on the light path, the settlement meter is mounted in a to-be-detected region, the air communicating tube is connected to the settlement meter and the liquid storage tank in series, and the liquid level communicating tube and the air communicating tube are separately connected to the settlement meter and the liquid storage tank in series, wherein the liquid level communicating tube is located below the liquid level and the air communicating tube is located above the liquid level. The system provided by the invention has the beneficial effects that (1) a single system can realize long-distance monitoring and transmission; (2) the system is low in cost and high in popularizing and applying feasibility; (3) a sensing end is not powered and communicated, and the system is simple in structure; and (4) the distributed optical fiber has the capability of anti-electromagnetic interference.

Description

technical field [0001] The invention relates to the field of infrastructure structure safety and health monitoring, in particular to a subway subsidence monitoring system based on distributed optical fiber strain sensing. Background technique [0002] With the acceleration of urbanization in our country and the increase of urban population, the urban traffic has brought great pressure. The subway has been popularized and applied because of its advantages of fast, convenient and large passenger capacity. At present, major cities are vigorously building subways. According to the medium and long-term development plan of rail transit, 3,000 kilometers will be built during the 13th Five-Year Plan period. By the end of the 13th Five-Year Plan, the national rail transit mileage will reach 7,000 kilometers. However, at present, domestic subway construction mostly presents the status quo of "reconstruction rather than maintenance", especially in my country's subway construction is st...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the deficiencies of the existing subway subsidence monitoring, such as high cost, short monitoring distance, complex structure of power supply and communication system, poor stability, inability to resist electromagnetic interference, and poor environmental adaptability, the present invention provides a distributed optical fiber based Subsidence Monitoring System Based on Strain Sensing Technology

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