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Brillouin distributed optical fiber sensing based structural deflection and subsidence monitoring system

A distributed optical fiber and settlement monitoring technology, which is applied in the field of structural deflection settlement monitoring system and infrastructure structure deflection settlement detection device, to achieve the effects of long-term online monitoring, convenient promotion and labor saving

Inactive Publication Date: 2015-01-28
无锡苏积传感科技有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] As far as the applicant knows, there is currently no mature detection device based on Brillouin distributed optical fiber sensing technology available for use

Method used

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  • Brillouin distributed optical fiber sensing based structural deflection and subsidence monitoring system
  • Brillouin distributed optical fiber sensing based structural deflection and subsidence monitoring system
  • Brillouin distributed optical fiber sensing based structural deflection and subsidence monitoring system

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] Such as Figure 1-5 shown.

[0032] A structural deflection / settlement monitoring system based on Brillouin distributed optical fiber sensing, including liquid constant pressure source, sensing container, sensing components, signal transmission optical fiber and Brillouin distributed optical fiber demodulation system, wherein the optical fiber and the Brillouin distributed optical fiber demodulation system belong to the prior art, so the present invention is no longer described, such as figure 1 As shown, the liquid constant pressure source includes oil tank 1, and the liquid level of oil 2 in oil tank 1 is maintained at a certain height, and the change of its liquid level is monitored by instrument 8 (pressure gauge or liquid level gauge can be used), and the oil source 9 and oil pipeline 10 to carry out automatic control of the liquid level; ...

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Abstract

A Brillouin distributed optical fiber sensing based structural deflection and subsidence monitoring system comprises a deflection / subsidence physical quantity conversion portion based on the principle of communicating vessels, a physical parameter sensing portion based on the Brillouin distributed optical fiber sensing technology and a deflection / subsidence evaluation system, and is specifically characterized in that the liquid level in an oil tank is kept at a certain height, oil is delivered to sensing vessels fixed on a measured structure through an oil pressure header pipe and branch pipes, an optical fiber is wound through pulleys and fixed on a piston and a bottom plate in each vessel, and when the deflection / subsidence of a measured point is increased, the strain of each corresponding optical fiber is increased, an internal free optical fiber section is just influenced by the temperature and can implement temperature compensation for the other optical fibers, the Brillouin distributed optical fiber sensing technology is used for strain and temperature sensing, and the evaluation system evaluates deflection / subsidence finally. The Brillouin distributed optical fiber sensing based structural deflection and subsidence monitoring system is flexible to arrange and capable of achieving a great quantity of series connection and suitable for long-term health monitoring of large infrastructures.

Description

technical field [0001] The invention relates to an engineering detection technology, in particular to an infrastructure structure deflection settlement detection device, in particular to a structural deflection settlement monitoring system based on Brillouin distributed optical fiber sensing. Background technique [0002] Structural deflection is an important parameter of bridge structure, and structural settlement is an important indicator of subway tunnel engineering. Their changes are highly related to the safety of the structure, and they are also mandatory indicators in the corresponding specifications. At present, the online monitoring of bridges generally uses the expensive GPS positioning system, but the accuracy of GPS monitoring the vertical deflection of beams is low, and there are still some signal blind spots in some areas. The settlement of the subway tunnel mainly relies on manual work and level instruments, which is time-consuming and expensive, and cannot b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C5/04G01M5/00G01B11/16
Inventor 王登位
Owner 无锡苏积传感科技有限公司
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