Distributed type optical fibre pipeline safe early-warning system based on phase interference

Abstract

The invention relates to a distributed optical fiber pipeline safety advance warning system based on phase interference. After passing through an optoisolator [17], a laser is divided into two bunches by an optical fiber coupler [15], and then passes through polarization state controllers [13a] and [13b], output and is connected with guide optical fibers [3a] and [4a] through ports [3] and [4], the guide optical fiber [3a] is connected with a fiber core [3b], the guide optical fiber [4a] is connected with fiber cores [7] and [8] after passing through a head end box [11], and the fiber cores [3b], [7] and [8] are connected with a terminal box [10]; fiber cores [1b] and [2b] which are led out of the terminal box [10] are respectively connected with guide optical fibers [1a] and [2a], respectively and sequentially connected with photodetectors [12a] and [12b] and signal conditioning units [14a] and [14b] through ports [1] and [2], and connected with a signal processing computer [18] after being differentially input into an analog-to-digital converter [16a] together; the fiber cores [7] and [8] which are led out of the terminal box [10] are connected to the head end box [11], respectively connected with photodetectors [12c] and [12d] by guide optical fibers [5a] and [6a] and ports [5] and [6], and are differentially input into an analog-to-digital converter [16b] together after the outputs are respectively connected with signal conditioning units [14c] and [14d], and the output of the analog-to-digital converter [16b] is connected with a signal processing computer [19].

Description

technical field [0001] The invention is a phase interference-based distributed optical fiber pipeline safety early warning system for safety protection and early warning of buried pipelines, structures or important ground structures, important facilities and areas. It involves the measurement of mechanical vibration, phase measurement, impact measurement and pipeline system technology. Background technique [0002] As the lifeline of the industrial economy, oil and gas pipelines occupy an important position in the national economy. The loss of oil and gas products, environmental pollution and personal injury due to the defects of the pipeline itself, corrosion, natural aging and third-party damage caused by external forces. With the continuous development of the pipeline transportation industry, in order to maintain the safe operation of the pipeline, the pipeline operation monitoring technology is also constantly developing. As the core of the pipeline monitoring, the leak...

AI Technical Summary

Problems solved by technology

These systems all claim to be able to solve technical problems in the field of pipeline safety, but there are problems in the limitations of signal detection sensitivity and detection length, as well as system stability, and cannot be applied in the field of industrial oil and gas pipelines

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