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Long-distance tunnel cross section deformation monitoring and warning system of identical fiber grating

A fiber grating and tunnel cross-section technology, applied in the direction of measuring devices, optical devices, instruments, etc., can solve problems such as car crashes, people's lives and national property losses, and achieve easy installation and use, light weight, and small size Effect

Active Publication Date: 2019-12-20
WUHAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

Once a large tunnel collapses, it is very easy to cause a car accident and cause a heavy loss of people's lives and national property

Method used

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  • Long-distance tunnel cross section deformation monitoring and warning system of identical fiber grating
  • Long-distance tunnel cross section deformation monitoring and warning system of identical fiber grating
  • Long-distance tunnel cross section deformation monitoring and warning system of identical fiber grating

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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0021] Large tunnels usually adopt a semicircular arch structure, figure 1 Shown is a schematic diagram of the structure. The inner diameter of the tunnel steel structure 1 is about 4.4 meters, the section width of the cement ballast bed 4 is about 4 meters, and the width of the steel rail 3 and the train body 2 is about 3.5 meters. Assuming that the position of the ballast bed 4 relative to the tunnel steel structure 1 remains unchanged, the deformation of the tunnel steel structure in the direction of gravity is transmitted to the orthogonal displacement converter 6 and the fiber grating by the ...

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Abstract

The invention discloses a long-distance tunnel cross section deformation monitoring and warning system of an identical fiber grating. The long-distance tunnel cross section deformation monitoring andwarning system comprises fiber deformation probe string, a chirp grating, a sound-light warning device and a broadband light source, wherein the fiber deformation probe string comprises two Y-shaped splitters, an orthogonal displacement converter and a fiber grating, the broadband light source is connected with a split port of a first Y-shaped splitter, a beam combination port of the first Y-shaped splitter is connected with the fiber grating deformation probe string by a fiber, the other split port of the first Y-shaped splitter is connected with a beam combination port of a second Y-shaped splitter by a fiber, a split port of the second Y-shaped splitter is connected in series with a wavelength demodulator, the other split port of the second Y-shaped splitter is connected in series withthe chirp grating, and the chirp grating is connected in series with the sound-light warning device. A wavelength division multiplexing technology is employed, multiple groups of identical fiber gratings with different central wavelengths are selected and are respectively arranged at each mark region of a tunnel, and the deformation of each mark region of a large-size tunnel is monitored in an real-time and on-line way.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to an identical optical fiber grating long-distance tunnel section deformation monitoring and alarm system. Background technique [0002] Various tunnels or similar tubular structures are common in municipal engineering, and real-time monitoring of their structural safety is extremely important. Once a large tunnel collapses, it is very easy to cause a car crash and cause a heavy loss of people's lives and national property. Therefore, it is very necessary to carry out daily monitoring and early warning of tunnels. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an identical optical fiber grating long-distance tunnel section deformation monitoring and alarm system, which adopts wavelength division multiplexing technology, selects several groups of identical optical fiber gratings with different...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 袁银权
Owner WUHAN UNIV OF TECH
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