Roadbed settlement monitoring device based on fiber Bragg grating

Abstract

The invention discloses a roadbed settlement monitoring device based on a fiber Bragg grating. The roadbed settlement monitoring device based on the fiber Bragg grating comprises at least two fiber Bragg grating liquid level sensors mounted on a monitoring surface; each fiber Bragg grating liquid level sensor comprises a cylindrical shell, and the bottom of each shell is mounted on a base; a rectangular cantilever beam, a cylindrical floating block and antifreezing solution are arranged inside each shell; the upper side and the lower side of each rectangular cantilever beam are respectively embedded into a fiber Bragg grating sensor, each floating block is suspended in the corresponding antifreezing solution, and each floating block is hinged with the free end of the corresponding rectangular cantilever beam; and the fiber Bragg grating sensors are welded and in serial connection with an optical cable, the optical cable is connected with a fiber Bragg grating demodulation instrument, strains of the rectangular cantilever beams when liquid levels in the shells are changed are acquired by virtue of the fiber Bragg grating demoulation instrument, adjacent upper sections of the shellsof the fiber Bragg grating liquid level sensors are communicated via a breather pipe, adjacent lower sections of the shells of the fiber Bragg grating liquid level sensors are communicated via a liquid flowing-through pipe, so as to enable the rectangular cantilever beams to produce bending deformation, and the liquid flowing-through pipe is connected with an automatic liquid level controller.

Description

technical field [0001] The invention relates to the field of embankment settlement monitoring devices, in particular to a roadbed settlement monitoring device based on optical fiber gratings. Background technique [0002] With the rapid development of high-speed railway construction, especially the increase of national investment in recent years, high-speed railway construction has entered a new stage of development. High-speed railway operation must meet the requirements of safety, reliability and comfort. To meet such requirements, all railway systems must have high quality and high reliability, among which the stability and smoothness of railway lines are the most important. Railway lines are composed of structures with different characteristics and properties, which work together to form smooth lines. Due to the differences in strength, stiffness, deformation, and materials of the structures that make up the line, it will inevitably cause track irregularities. The irre...

AI Technical Summary

Problems solved by technology

There are large errors in the traditional static level measurement method, mainly caused by the infiltration of the floating ball, the inclination of the guide rod, and the buoyancy changes caused by temperature and air pressure, and the traditional static level sensor has a high damage rate and relatively poor accuracy. Disadvantages such as many wirings, poor long-term stability, poor anti-electromagnetic interference ability, poor anti-water interference ability, short service life, low degree of automation, and can only be measured at fixed points

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