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Safety monitoring system based on distributed optical fiber

A distributed optical fiber and safety monitoring technology, which is applied in the pipeline system, gas/liquid distribution and storage, mechanical equipment, etc., can solve the problem of high cost

Inactive Publication Date: 2009-10-14
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention patent 200710051004.2 we applied for uses a modified Sagnac interferometer to form a long-distance pipeline safety monitoring system, two sensing lines, it is feasible to use the spare optical fiber on the pipeline advantageously, but it is feasible to use two branches to demodulate and suppress noise, which costs more

Method used

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  • Safety monitoring system based on distributed optical fiber
  • Safety monitoring system based on distributed optical fiber
  • Safety monitoring system based on distributed optical fiber

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Embodiment Construction

[0040] 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.

[0041] Embodiments of the present invention are as follows:

[0042] 1. Implementation plan 1 safety monitoring long-distance communication optical cable, this example is an experimental prototype, its composition is as follows figure 1 shown. 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 1 is a PC104 system, the light source driver 2, and the circuit processing board 11 with a detector are a 1MHz12bitA / D chip, a PIN detector, a driving circuit, a processing circuit, and a buff...

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Abstract

The invention discloses a safety monitoring system based on distributed optical fiber, comprising a transmitted and received light signal processing module 100, a light delay component 101 and a loop optical fiber part 102 which are formed into a double-variant-type optical fiber Sagnac interferometer. The transmitted and received light signal processing module 1 comprises a computer 1, a light source driver 2, a light source 3, a polarization remover 4, a detector 10 and a circuit processing board 11 with a detector. The light delay component 2 comprises a 3*3 optical fiber coupler 5, a short fiber 6, a long fiber 7 and a 2*1 coupler 8. The loop optical fiber part 102 relates to induction optical fibers 9 of two cases, i.e. vibration and impact act on the two optical fibers in a loop or on one optical fiber in the loop. A single system is additionally provided with a light switch to perform multi-channel periodic route-inspection measurement and monitor large-area vibration. The remote intelligent monitoring can be realized through the networking of a plurality of monitoring systems.

Description

technical field [0001] The invention discloses a safety monitoring system based on distributed optical fibers, relates to distributed measurement of vibration and impact, and belongs to the technical field of safety prevention. 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. [0003] In recent years, the absolute security of optical fiber information transmission has been broken, and eavesdropping incidents on terrestrial optical cable lines have been reported frequently, ...

Claims

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Application Information

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