Method for improving oil gas pipe leakage and performance of instruction testing distributed optical fibre sensor

A technology for distributed optical fiber and oil and gas pipelines, applied in pipeline systems, gas/liquid distribution and storage, instruments, etc., can solve problems such as limiting the detection distance of distributed optical fiber sensors, increase the number of sampling points, improve positioning accuracy, and improve space The effect of resolution

Inactive Publication Date: 2008-09-03
ZHENGZHOU UNIV
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Problems solved by technology

Therefore, the maximum frequency at which external events cause transmission loss in the sensing fiber [2] limits the minimum sampling frequency of transmission loss and the m

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  • Method for improving oil gas pipe leakage and performance of instruction testing distributed optical fibre sensor
  • Method for improving oil gas pipe leakage and performance of instruction testing distributed optical fibre sensor
  • Method for improving oil gas pipe leakage and performance of instruction testing distributed optical fibre sensor

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[0046] Such as figure 1 As shown, the distributed optical fiber sensor of the present invention includes a sensing optical fiber and a backscattered light detection module and a fiber output optical power detection module respectively located at both ends of the sensing optical fiber. The method that utilizes Golay code that the present invention proposes to improve the distributed optical fiber sensor performance of pipeline leakage and intrusion event detection comprises the following steps:

[0047] 1) The computer 5 uses Golay codes and their inverse codes to modulate the laser pulse generator 101, so that the output of the laser pulse generator 101 is an optical pulse sequence whose amplitude is modulated by the Golay codes and their inverse codes.

[0048] 2) The optical pulse sequence output by the laser pulse generator 101 is coupled into the sensing optical fiber 2; during the forward propagation of the optical pulse sequence along the sensing optical fiber 2, its amp...

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Abstract

The invention relates to a method for improving performance of a distributed optical fibre sensor for detecting oil gas conduit leakage and inbreak by using Golay code. Detection signals in the sensing optical fibre are continuous optical pulse sequences modulated by Golay code and complement code thereof. The optical pulse sequences are sampling signals of sensing optical fiber transportation consumption. By reducing pulse width of optical pulse sequences, not only sampling frequency of sensing fiber transportation consumption is increased to analyze characters of new transportation consumption in the sensing optical fibre caused by conduit leakage and third party inbreak case in a larger frequency spectrum range, but also spatial resolution of synthesized backscattering optical signals is increased by analyzing to increase positioning accuracy of the new consumption. In another aspect, by adding optical pulse amount in sequences, not only sampling amount of transportation consumption is increased to facilitate characters analysis for new transportation consumption signals in the sensing optical fibre, but also intensity of synthesized backscattering optical signals and signal-to-noise ratio are increased, and the distance of conduit is increased.

Description

technical field [0001] The invention belongs to the technical field of signal detection and analysis, relates to an online detection method, in particular to a method for improving the performance of a distributed optical fiber sensor for detecting oil and gas pipeline leakage and third-party intrusion events by using Golay codes. Background technique [0002] Pipeline transportation is an economical and convenient mode of transportation, which has unique advantages in the transportation of oil and natural gas, especially in terms of safety, convenience and efficiency. Long-distance oil and gas pipelines have become an important part of my country's energy artery, and their strategic position is very important. Long-distance oil and gas pipelines are characterized by multiple points and long lines, and most of them are buried pipelines. Due to the harsh service environment, corrosion, topographical settlement, heavy pressure, mechanical construction and man-made damage may ...

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Application Information

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IPC IPC(8): F17D5/02G01M3/00
Inventor 王延年蒋庄德李正民
Owner ZHENGZHOU UNIV
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