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A damage early warning device and method for buried and pipe-laid optical cables

A technology of pipeline laying and early warning devices, which is applied to alarms, instruments, electrical components, etc., and can solve problems such as easily damaged optical cables and losses

Active Publication Date: 2021-04-09
GUILIN G LINK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] If the large-scale mechanical engineering construction near the optical cable line is not careful or the construction personnel do not know that there is an optical cable nearby, the optical cable will be easily damaged, and this damage will cause heavy losses.

Method used

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  • A damage early warning device and method for buried and pipe-laid optical cables

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Embodiment

[0025] refer to figure 1 , a damage early warning device for buried and pipe-laid optical cables, which is different from the prior art in that it includes sequentially connected Φ-OTDR modules 1, 1xN optical switches 2, a group of 1x2 optical switches 4, and a group of sensing fibers 5 and a group of fiber optic reflectors 6, wherein each 1x2 optical switch 4 is connected with a single-axis Sagnac interferometer module 3, the Φ-OTDR module 1 is connected with the common end of the 1xN optical switch 2, and the branch ends of the 1xN optical switch 2 are respectively connected One branch end of each 1x2 optical switch 4, each single-axis Sagnac interferometer module 3 is respectively connected to the other branch end of the 1x2 optical switch 4, and the proximal end of each sensing fiber 5 is respectively connected to the common of a 1x2 optical switch 4 The far end of each sensing fiber 5 is connected to a fiber optic reflector 6 respectively.

[0026] The numbers of the 1×2...

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Abstract

The invention discloses a damage early warning device for underground buried and pipeline laying optical cables. The device includes sequentially connected Φ-OTDR modules, 1xN optical switches, a group of 1x2 optical switches, a group of sensing optical fibers and a group of optical fiber reflectors , wherein, each 1x2 optical switch is connected with a single-axis Sagnac interferometer module, the Φ‑OTDR module is connected with the common end of the 1xN optical switch, and the branch end of the 1xN optical switch is respectively connected with a branch end of each 1x2 optical switch, each The single-axis Sagnac interferometer module is respectively connected to the other branch end of the 1x2 optical switch, the near end of each sensing fiber is respectively connected to the common end of a 1x2 optical switch, and the far end of each sensing fiber is respectively connected to a fiber optic reflector. The device has the advantages of low cost, simple structure, strong adaptability, and strong anti-electromagnetic interference capability. This method has wide monitoring range, strong real-time monitoring, and fast fault response. At the same time, the invention also discloses a damage early warning method for buried and pipeline laid optical cables.

Description

technical field [0001] The invention relates to OTDR (optical time domain reflectometer) technology, optical fiber coherent detection technology and optical cable vibration sensing technology, in particular to a damage early warning method and device for buried and pipeline-laid optical cables. Background technique [0002] If the large-scale mechanical engineering construction near the optical cable line is not careful or the construction personnel do not know that there is an optical cable nearby, the optical cable will be easily damaged, and this damage will cause major losses. Contents of the invention [0003] The object of the present invention is to provide a damage early warning device and method for buried and pipeline laying optical cables in view of the deficiencies in the prior art. The device has the advantages of low cost, simple structure, strong adaptability, and strong anti-electromagnetic interference capability. This method has wide monitoring range, str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/071H04B10/079G08B21/24
CPCG08B21/24H04B10/071H04B10/0791
Inventor 黄凤玲赵奎文金朝
Owner GUILIN G LINK TECH
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