Optical path system for natural gas pipeline leakage monitoring based on optical fiber sensing

Abstract

The invention provides a natural gas pipe leakage monitoring optical path system based on optical fiber sensing and relates to the technical field of mechanical vibration measurement, impact measurement and a pipe system. The natural gas pipe leakage monitoring optical path system based on the optical fiber sensing is formed by a light source, optical path adapters, a transmission optical cable and optical fiber sensing units. Each optical path adapter is composed of an optical beam splitter and an optical beam combiner, the optical fiber sensing units are adhered onto a natural gas pipe at a certain distance, every 2-10 adjacent sensing units are of a group, each group of the sensing units adopt two transmission optical fibers, a transmitting optical fiber and a returning optical fiber for transmitting laser light and interference signals; the two transmission optical fibers are sequentially connected with corresponding optical path adapters in series according to setting positions of the sensing units, each optical path adapter is respectively communicated with the corresponding optical fiber sensing units through the two optical fibers, and finally the returning optical fiber in the transmission optical fibers enables the interference signal to be returned to a main machine of the system. The natural gas pipe leakage monitoring optical path system based on the optical fiber sensing is high in sensitivity and accuracy, low in false alarm rate and not prone to be influenced by environment.

Description

technical field [0001] The invention is an optical system for monitoring natural gas pipeline leakage based on optical fiber sensing. It relates to the technical field of measurement of mechanical vibration, measurement of impact 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 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 main method of de...

AI Technical Summary

Problems solved by technology

However, the technical requirements for the installation of the optical fiber sensing unit are complex, and the design is difficult. The main thing is to ensure that the detection sensitivity of the optical fiber sensing unit is high enough and the noise isolation is good.

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