Method and system for multiplexing/de-multiplexing natural gas pipe leakage optical fiber monitoring sensor
A technology for natural gas pipelines and monitoring sensors, applied in pipeline systems, gas/liquid distribution and storage, mechanical equipment, etc., can solve the problems of complex installation technology requirements and difficult design of optical fiber sensors.
Active Publication Date: 2013-03-27
BC P INC CHINA NAT PETROLEUM CORP +1
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[0052] Embodiment. This embodiment is an embodiment designed for the sensor of the optical fiber monitoring system for natural gas pipeline leakage, so it needs to be carried out on the basis of the embodiment of the monitoring system. The monitoring system consists of figure 1 As shown in the figure, an optical fiber sensor is installed on the pipe body every 1.5km, and a total of 10 sensors are installed. The first five sensors and the last five sensors constitute a sensor group respectively. Each fiber optic sensor group uses a return fiber to connect with 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 acquisition and processing module includes signal conditioning, signal acquisition , processing unit, terminal display and external interface; the signal output by the photodetector is serially connected to the signal conditionin...
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The invention discloses a method and system for multiplexing / de-multiplexing a natural gas pipe leakage optical fiber monitoring sensor. The optical frequency of a laser is modulated to generate leakage detecting light, a Michelson interferometer or Mach-Zehnder interferometer of which the optical arm difference is different serves as a leakage sensor, and a plurality of sensors are arranged on the outer wall of a pipe; the adjacent sensors with different arm length differences form a sensor group, and a signal of each sensor in each sensor group is transmitted to a photoelectric detector of a receiving end through a returning optical fiber; signals of each sensor group are transmitted to the receiving end through an independent returning optical fiber in a space division multiplex way; and the transmitted sensing signals are de-multiplexed in a frequency-dividing way, primary sonic signals of pipe leakage are modulated by the phase carrier technology, and the information of leakage points of the pipe is accurately acquired by identifying, positioning and analyzing the leakage signals. The method and the system save investment, are high in sensitivity and accuracy, and low in false alarm rate and are not easily affected by environmental factors.
Description
technical field [0001] The invention relates to a multiplexing / demultiplexing method and system of a natural gas pipeline leakage optical fiber monitoring sensor, and relates to the technical fields of mechanical vibration measurement, impact measurement and pipeline 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 become the main mode of energy transportation in the world. The transportation of oil products in developed countries and oil-producing regions in the Middle East has all been pipelined. my country's pipelines have also developed rapidly in recent years, with a total length of more than 70,000 kilometers. It has initially formed a large-scale energy pipeline network that spans east-west, north-south, covers the whole country, and connects overseas. Pipeline transportation has become the deployment of strategic energy such as oi...
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IPC IPC(8): F17D5/02
Inventor 张金权王小军焦书浩方德学王历军刘春平杨娜姜毅曾科宏蒋启善
Owner BC P INC CHINA NAT PETROLEUM CORP