Distributed optical fibre oil gas conveying pipeline early early-warning system based on polarization detection

A distributed optical fiber and early warning technology, which is applied in the pipeline system, gas/liquid distribution and storage, and the use of optical devices to transmit sensing components, etc., can solve the problems of inability to warn criminals, short monitoring distance, troublesome sensor design, etc.

Inactive Publication Date: 2008-09-17
于晋龙 +3
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Problems solved by technology

At present, OTDR technology is relatively mature, and there are corresponding products on the market, but there are still some shortcomings for long-distance pipeline leakage monitoring: (1) The design of the sensor is troublesome and the cost performance is low; (2) It is not sensitive to small leaks; (3) short monitoring distance
However, since the optical phase is very sensitive to environmental changes, the optical fiber sensing system based on inte...

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  • Distributed optical fibre oil gas conveying pipeline early early-warning system based on polarization detection
  • Distributed optical fibre oil gas conveying pipeline early early-warning system based on polarization detection
  • Distributed optical fibre oil gas conveying pipeline early early-warning system based on polarization detection

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Embodiment

[0044] The principle of the present invention will be further described in detail below in conjunction with the accompanying drawings and the embodiment completed by the inventor according to the technical solution, and the present invention is not limited to this embodiment.

[0045] figure 1 It is a system block diagram of an embodiment of the present invention, wherein the definitions of forward light and reverse light polarization states of different ports of each device, and the working principle of the system are as follows figure 2 shown. First, explain the evolution process of the polarization state of each port when there is no disturbance in the sensing line:

[0046] Adjust the polarization controller so that: S → 1 P = S → 2 P (1)

[0047] Assume that w...

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Abstract

The invention relates to a polarization-based early warning system of a distributed optical fiber oil transporting pipeline, which comprises a laser. A forward-propagating optical signal sent from a laser is input from a first port of a polarization beam splitter, and output from a second port to sensing optical fiber connected with a Faraday polariscope. The forward-propagating optical signal is reflected by the Faraday polariscope, and becomes a backward-propagating optical signal after the polarization state of the signal rotates 90 DEG. The backward-propagating optical signal is input from the second port of the polarization beam splitter, and output from a third port to a photoelectric detector. The changed electrical signal is transmitted to a digital signal processing subsystem. The early warning system can position a sensing line perturbing point according the time information of electric power change so as to output alarm and positioning information. The early warning system has the advantages of low cost, high safety and reliability. Furthermore, the early warning system can early position and warn against acts of sabotage to the oil transporting pipeline.

Description

【Technical field】: [0001] The invention belongs to the technical field of long-distance and distributed optical fiber sensing, in particular to an early warning system for distributed optical fiber oil and gas pipelines based on polarization detection. 【Background technique】: [0002] As a safe and economical transportation method, the pipeline transportation system has been widely used in oil, natural gas and other industrial sectors. However, in recent years, oil pipelines have been drilled and stolen from time to time, causing huge economic losses. This makes oil and gas pipelines Automatic monitoring technologies are becoming increasingly important. [0003] At present, the relatively mature pipeline leakage detection technologies at home and abroad can be roughly divided into two categories: internal detection and external detection, including internal detection methods: magnetic flux leakage detection, ultrasonic detection, eddy current detection, camera and video dete...

Claims

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Application Information

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IPC IPC(8): F17D5/02G01D5/30
Inventor 于晋龙张立台王文睿韩丙辰
Owner 于晋龙
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