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Submarine cable anchor damage monitoring and positioning method and system based on distributed optical fiber sensing

A technology of distributed optical fiber and positioning method, which is applied to measurement devices, ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problem of inability to accurately predict the damage of submarine cable anchors, save human and material resources, and filter out false alarms. Effect

Active Publication Date: 2020-02-11
WUHAN WUTOS
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method and system for monitoring and positioning submarine cable an

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  • Submarine cable anchor damage monitoring and positioning method and system based on distributed optical fiber sensing
  • Submarine cable anchor damage monitoring and positioning method and system based on distributed optical fiber sensing
  • Submarine cable anchor damage monitoring and positioning method and system based on distributed optical fiber sensing

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Embodiment Construction

[0052] 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.

[0053] The present invention uses a distributed optical fiber sensing system to collect seawater flow signals under normal conditions, and simulates the events of anchor dragging, anchor dropping, and ship anchor hooking a submarine cable to collect corresponding signal data. The analysis of various signals is as follows:

[0054] The main component of the vibration signal caused by the water flow is concentrated in the low frequency. Therefore, after high-pass filtering the signal, it can have a certain inhibitory effect on the interference of the water flow.

[0055] When the anchor drop event ...

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Abstract

The invention discloses a submarine cable anchor damage monitoring and positioning method based on distributed optical fiber sensing. The submarine cable anchor damage monitoring and positioning method comprises the steps of: acquiring a sensing signal of a distributed optical fiber sensing submarine cable; filtering out a low-frequency part; forming a short-time zero-crossing rate waterfall plotand a frequency domain energy waterfall plot; judging and dividing an region where an anchor falling or dragging event occurs by means of the frequency domain energy waterfall plot; and identifying and positioning the anchor dragging event and the anchor falling event in a marking and connected domain manner.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to a method and system for monitoring and positioning submarine cable anchor damage based on distributed optical fiber sensing. Background technique [0002] The submarine cable power transmission project is an important part of the cross-sea networking project construction. As the number of submarine cable lines continues to increase, the failure of submarine cables due to anchor hooking in offshore areas is becoming more and more serious. Anchor damage accounts for more than 80% of submarine cable mechanical failures, and different degrees of anchor damage will lead to leakage, grounding, short circuit and cable breakage accidents in submarine cables. The repair time of submarine cable damage is very long, and the maintenance cost is extremely expensive. Repairs cost millions or even tens of millions at a time, and submarine cable failures will cause power or communication in...

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Application Information

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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 杨玥田铭王颖徐绍刚明昌朋刘洪凯
Owner WUHAN WUTOS