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Method and system for resisting phase fading of natural gas pipe leakage optical fiber detecting system

A natural gas pipeline and optical fiber detection technology, which is applied in pipeline systems, gas/liquid distribution and storage, mechanical equipment, etc., can solve problems such as poor anti-interference ability, achieve accurate positioning, and improve sensing sensitivity

Active Publication Date: 2013-03-27
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of technology is affected by interference events around the pipeline when monitoring leakage, has a high system false alarm rate, and has poor anti-interference ability

Method used

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  • Method and system for resisting phase fading of natural gas pipe leakage optical fiber detecting system
  • Method and system for resisting phase fading of natural gas pipe leakage optical fiber detecting system
  • Method and system for resisting phase fading of natural gas pipe leakage optical fiber detecting system

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Embodiment

[0056] Embodiment: the composition of this example is as figure 1 with figure 2 As shown, it includes a light source, an optical system and a circuit part; a fiber optic sensor is installed on the pipeline body every 1.5km, and a total of 10 sensors are installed. The first 5 sensors and the last 5 sensors form a sensor group respectively, and each fiber optic sensor The group shares a launch fiber to connect with the light source, and each fiber sensor group uses a return fiber to connect to the photodetector; the output of the photodetector is connected to a signal acquisition and processing module including leakage signal identification and event location functions, and the signal The acquisition and processing module includes a signal conditioning unit, a signal acquisition unit, a processing unit, a terminal display and an external interface; the signal output by the photoelectric detector is sequentially connected to a signal conditioning unit, a signal acquisition uni...

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Abstract

The invention discloses a method and system for resisting phase fading of a natural gas pipe leakage optical fiber detecting system and relates to the technical field of mechanical vibration measurement, impact measurement and a pipe system. A sensor with a Michelson interferometer or Mach-Zehnder interferometer structure is arranged on a pipe body every certain interval, and each sensor is connected in parallel between a transmitting optical fiber and a returning optical fiber through a light beam splitter and a light beam combiner; a serrasoidal / inverse serrasoidal wave modulation-based laser serves as a light source, a Michelson interferometer or a Mach-Zehnder interferometer which is not equal in arm length serves as the sensor, a cosine signal carrier similar to single frequency is generated in an interferometer signal, and a primary leakage sonic signal is acquired by modulating the carrier signal by using a cosine signal and a sine signal which have the same frequency as the carrier signal. The problems of unstable sensitivity and unstable signal to noise ratio caused by phase fading can be effectively solved, and a leakage signal is reliably detected.

Description

technical field [0001] The invention is an anti-phase fading method and system of a natural gas pipeline leakage optical fiber detection system. It involves the measurement of mechanical vibration, the measurement of impact and the technical field of piping system. Background technique [0002] At present, the total length of pipelines built in the world has reached 2.5 million kilometers, which has surpassed the total mileage of railways and has become the main mode of energy transportation in the world. Oil transportation in developed countries and oil-producing regions in the Middle East has all realized pipelines. my country's pipelines have also developed rapidly in recent years, with a total length of more than 70,000 kilometers. A large energy pipeline network has initially formed across the east, west, north and south, covering the whole country, and connecting overseas. Pipeline transportation has become the deployment of strategic energy such as oil and gas. The ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17D5/02
Inventor 张金权王小军焦书浩侯志相王赢方德学张俊杨程云涛于立成黄现玲
Owner BC P INC CHINA NAT PETROLEUM CORP
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