Long-distance distributed optical fiber vibration sensing system and method thereof

A vibration sensing system, distributed optical fiber technology, applied in optics, nonlinear optics, measurement devices, etc., can solve the problems of low positioning accuracy, unsatisfactory, complex demodulation algorithm, etc., to improve detection sensitivity and positioning accuracy. , the effect of large dynamic range

Inactive Publication Date: 2009-12-16
SHANGHAI BOOM FIBER SENSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, this distributed optical fiber vibration sensing system based on dual M-Z interferometers has problems such as low positioning accuracy and complex demodulation algorithm due to its inherent properties, which cannot meet the growing demand

Method used

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  • Long-distance distributed optical fiber vibration sensing system and method thereof
  • Long-distance distributed optical fiber vibration sensing system and method thereof
  • Long-distance distributed optical fiber vibration sensing system and method thereof

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Effect test

Embodiment 1

[0043] see figure 1 , the present invention discloses a long-distance distributed optical fiber vibration sensing system, which includes a sensing system for sensing external vibration events, and a detection and control system for detecting and controlling vibration signals, and the sensing system is connected to the detection and control system.

[0044] 【Induction system】

[0045] The induction system includes a light source, a pulse modulator, an optical fiber circulator, a first optical fiber amplifier, and a first optical fiber filter optical switch. Preferably, the laser is an ultra-narrow linewidth fiber laser.

[0046] In addition, the laser can also be connected with a second fiber amplifier and a second filter to amplify its power.

[0047] The light source includes a connected laser driver and a laser; the laser driver is connected to a controller and receives a control signal from the controller to drive the laser to emit laser light.

[0048] The pulse modulat...

Embodiment 2

[0076] A sensing method for a long-distance distributed optical fiber vibration sensing system. When the system starts to work, the computer drives the controller to send a control signal. After receiving the control signal, the laser driver drives the laser to start working and emit laser light; at the same time, the controller drives the pulse modulation The laser works by modulating the continuous light emitted by the laser into a pulsed light of a certain period; the pulsed light is injected into the sensing optical cable after passing through the optical fiber circulator; the laser will have Rayleigh scattering in the sensing optical cable, and the back Rayleigh scattered light passes through the optical fiber After the circulator is amplified by the optical fiber amplifier, after being filtered by the filter, it is input to the optical switch; at the same time, the controller sends a control signal to the switch to drive the optical switch to select different output channe...

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Abstract

The invention discloses a long-distance distributed optical fiber vibration sensing system and a method thereof. The system comprises an induction system for inducting outside vibration events and a detecting and controlling system for detecting and controlling vibration signals; the induction system is connected with the detecting and controlling system. The induction system comprises a light source, a pulse modulator, an optical fiber circulator, a first optical fiber amplifier, and a light switch of a first optical fiber filter. The detecting and controlling system comprises a plurality of optical-electrical converters and a system control unit; the system control unit collects output light of the converters, analyzing the collected signals and judges whether the alarm is needed according to the analysis result. The invention adopts the optical switch technology to adopt time-division processing on backward Rayleigh scattering light which is reflected back, the dynamic range of the system is large, and the sensible distance can be tens of kilometers as high as possible, even hundreds of kilometers; and the invention adopts phase detecting technology and optical time domain reflection technology and can greatly improve detecting sensibility of the system and positioning precision.

Description

technical field [0001] The invention relates to a distributed optical fiber vibration sensing system, in particular to a long-distance distributed optical fiber vibration sensing system; in addition, the invention also relates to a long-distance distributed optical fiber vibration sensing method. Background technique [0002] Sensing and alarm systems such as perimeter security, border prevention, earthquake detection, and tsunami early warning play a huge role in ensuring the stability of people's lives and protecting people's lives and property. The essence of such systems lies in the detection and analysis of vibration signals . With the development of optical devices and optical communications, fiber optic sensing technology is increasingly used in the field of sensing, gradually replacing some traditional electrical sensors. [0003] Due to the essential characteristics of optical fiber are sensitive to signals such as vibration, stress and sound waves, vibration sensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00G02F1/35
Inventor 仝芳轩齐龙舟刘亮皋魏席刚周正仙
Owner SHANGHAI BOOM FIBER SENSING TECH
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