Safety monitoring system of long-distance pipeline

A safety monitoring, long-distance technology, applied in the field of pipeline systems, to achieve high positioning accuracy, system signal-to-noise ratio assurance, and wide application effects

Inactive Publication Date: 2009-10-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
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However, due to the congenital deficiency in principle, th...

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  • Safety monitoring system of long-distance pipeline
  • Safety monitoring system of long-distance pipeline
  • Safety monitoring system of long-distance pipeline

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Embodiment Construction

[0029] For purposes of summarizing the invention, certain aspects, advantages and novel features of the invention are described herein. It should be understood that not necessarily all such advantages can be achieved in accordance with any one particular embodiment of the invention. Accordingly, the invention is not to be limited to any particular embodiment disclosed.

[0030] Embodiments of the present invention are as follows:

[0031] 1. Implementation plan 1 safety monitoring long-distance communication optical cable, this example is an experimental prototype, its composition is as follows figure 1shown. The thick connecting wires in the figure are optical fibers, provided by Chengdu Zhongzhu Optical Cable Co., Ltd., and the thin connecting wires are electric wires. The computer 5 is a PC104 system, the light source driver 6, and the circuit processing board 10 with a detector are three 1MHz12bit A / D chips, three PIN detectors, a driving circuit, a processing circuit,...

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Abstract

The invention discloses a safety monitoring system of a long-distance pipeline, comprising a transmitted and received light signal processing module 1, a light delay component 2, a single-line optical fiber 3 and a nonlinear optical environment 4 with a probing blind area, which are all formed into a variant-type optical fiber Sagnac interferometer. A polarization control element is used for ensuring the maximum interference intensity, and at least three wavelengths and three coherent light pulse signals are used for independently obtaining data to inhibit noise produced by the light source fluctuation and the polarization state change. The preservation time of A/D sampling is greater than the value of a pulse width, and the A/D sampling frequency is greater than the light source repetition frequency. A probe completely transforms each returned coherent light pulse so that an electric signal is undistorted. A single detection system has no relay to detect the distance of over 100 km.

Description

technical field [0001] The invention discloses a long-distance pipeline safety monitoring system constructed by using the optical fiber Sagnac interference principle, relates to distributed measurement of vibration and impact, and belongs to the technical field of pipeline systems. Background technique [0002] Maintaining the security of infrastructure is a basic requirement for social stability and rapid economic development. Safety monitoring of infrastructure such as communication cables, high-voltage power grids, oil pipelines, gas pipelines, bridges, dams, and buildings to determine health, maintenance needs, life expectancy, and other characteristics is not only a guarantee for the technical functions of these facilities, It is an effective means to avoid major economic losses and maintain social stability and development. In recent years, the absolute security of optical fiber information transmission has been broken, and eavesdropping incidents on terrestrial optic...

Claims

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Application Information

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IPC IPC(8): F17D5/02G01H9/00
Inventor 张利勋刘永智彭增寿代志勇欧中华
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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