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High-precision tunnel crack monitoring system and method based on low-coherence interference technology

A low-coherence interference and monitoring system technology, applied in the field of disease monitoring in tunnels, can solve problems such as low-coherence interference type optical fiber sensing technology that has not yet been found, and achieve the effects of low monitoring cost, high monitoring accuracy, and strong anti-electromagnetic interference.

Active Publication Date: 2020-05-12
SHENZHEN UNIV
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Problems solved by technology

At present, no method based on low-coherence interference optical fiber sensing technology has been found in the methods for monitoring tunnel segment cracks

Method used

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  • High-precision tunnel crack monitoring system and method based on low-coherence interference technology
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  • High-precision tunnel crack monitoring system and method based on low-coherence interference technology

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Embodiment Construction

[0054] The application will be described in further detail below in conjunction with the accompanying drawings.

[0055] figure 1 A perspective view of a tunnel crack monitoring system is shown.

[0056] Such as figure 1 As shown, the tunnel crack monitoring system includes a broadband light source 1, a signal acquisition and processing system 2, a first coupler 3, a second coupler 4, a third optical fiber cable 5, an LCI optical fiber sensor 6, an optical fiber 8 cut flat at the end, a reflective Mirror 9, optical mobile scanning platform 10, in which the LCI fiber optic sensor 6 is arranged in a "V" shape, and it also includes a signal arm 7 and a reference arm 11.

[0057] The signal arm 7 of the LCI fiber optic sensor 6 is connected with the broadband light source 1 through the first fiber optic cable 17, the reference arm 11 of the LCI fiber optic sensor 6 is connected with the signal acquisition and processing system 2 through the third fiber optic cable 18, and the si...

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Abstract

The invention aims to provide a tunnel crack monitoring system and method based on the low-coherence interference technology. The system comprises a broadband light source, a first optical fiber cable, a second optical fiber cable, a third optical fiber cable, a first coupler, a second coupler, an LCI optical fiber sensor arranged on the inner wall of a tunnel in a V-shaped mode, an optical mobilescanning platform, an optical fiber with the tail end cut flat and a signal collecting and processing system. The displacement change is obtained by measuring the wavelength change through the tension optical fiber cables fixed by two adjacent points, then the development condition of segment cracks in the tunnel is reflected, the tunnel segment crack monitoring device has the advantages of beinghigh in monitoring precision, low in monitoring cost and high in electromagnetic interference resistance, and the optical fiber sensor is suitable for long-term monitoring of the tunnel and can be applied to engineering practical conditions.

Description

technical field [0001] The present application relates to the technical field of defect monitoring in tunnels, in particular to a high-precision tunnel crack monitoring system and method based on Low-coherence Interferometry (LCI) technology. Background technique [0002] With the development of the times, fiber optic sensing technology, as a new monitoring technology, has been gradually applied to tunnel crack prediction, structural settlement, segment dislocation, etc. in the past ten years, and has developed rapidly. [0003] Existing patents have proposed some crack monitoring methods based on different types of optical fiber sensor technologies, such as the concrete structure crack monitoring and early warning system and early warning method described in CN108709856A, which has the advantages of higher automation and intelligence in the monitoring process; patent The plastic optical fiber crack monitoring device and monitoring method based on optical time domain reflect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88G01B11/16
CPCG01B11/161G01N21/88
Inventor 付艳斌洪成雨李云鹏陈湘生
Owner SHENZHEN UNIV
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