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Distributed optical fiber region warning system

A distributed optical fiber and area technology, which is applied in alarms, anti-theft alarms, anti-theft alarm mechanical start-ups, etc., can solve problems such as poor real-time restoration ability of vibration signals, inability to locate narrowband signal positioning accuracy, external interference, etc., to improve the anti-theft The effect of interference ability and signal detection sensitivity, flexible layout, and strong signal positioning ability

Active Publication Date: 2019-08-16
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0004] The present invention is a distributed optical fiber regional warning system, which aims to overcome the shortcomings of the linear Sagnac interference structure that is susceptible to external interference, cannot locate narrow-band signals and has poor positioning accuracy, and overcome the vibration of coherent detection light time domain reflection structure The defect of poor signal real-time restoration ability

Method used

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  • Distributed optical fiber region warning system

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specific Embodiment approach

[0014] The chaotic laser 1 outputs the chaotic light whose center wavelength is 1310nm to the optical fiber multi-way coupler 2 f port; the optical fiber multi-way coupler 2 divides the signal into three parts of 1:1:1, respectively from a , b , c three port outputs; in order to form two-way interference signals, the optical fiber multi-way coupler 2 a The port is connected to the first fiber coupler 4 after the delay fiber 3 a port; the fiber optic multi-coupler 2 b The port is not connected to any device; the optical fiber multi-way coupler 2 c port connected to the first fiber coupler 4 of the b port; the first fiber coupler 4 c port connected to the third fiber coupler 11 of the b port; the narrow linewidth laser 5 outputs the continuous light whose central wavelength is 1550nm to the second fiber coupler 6 c port; the second fiber coupler 6 b The port is connected to the input end of the acousto-optic modulator 7; the acousto-optic modulator 7 modulates the conti...

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Abstract

The invention discloses a distributed optical fiber region warning system. The region warning and intrusion recognition can be performed by utilizing the distributed optical fiber sensing technology.By utilizing a chaotic laser source with wide spectrum and low self-correlated noise, interference resistance and signal detection sensitivity of a sensing system are improved; by adopting a wave-division multiplexing technology, the separation of the detection light is realized through a dense wave-division multiplexer and an optical filter, and the linear Sagnac interference technology and the coherent detection light time domain reflection technology are integrated, thereby realizing the real-time reduction and accurate positioning on the vibration and sound signals on a single sensing optical fiber. The whole system is strong in concealing, flexible in layout, simple in structure and electromagnetic resistant, and has huge application potential on the security regions of the military base and other important places.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a distributed optical fiber area warning system. Background technique [0002] Military bases have a high level of confidentiality and heavy security tasks. Usually, regional security systems are required to prevent external intrusions. However, traditional security technologies have certain limitations. For example, the barbed iron net is easy to be cut and intruded, the high-voltage power grid is prone to accidental injury and consumes a lot of power, and the electronic fence is susceptible to electromagnetic interference. With the continuous development of fiber optic sensing technology, the fiber optic vibration sensing technology used for perimeter security and intrusion identification has gradually gained attention. Due to the advantages of no charge, light weight, easy bending, anti-electromagnetic, anti-radiation and other advantages of the optical fiber it...

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Application Information

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IPC IPC(8): G08B13/12
CPCG08B13/124
Inventor 王宇刘昕郭茂森白清张红娟高妍靳宝全
Owner TAIYUAN UNIV OF TECH
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