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
CN101603856AInactive Publication Date: 2009-12-16SHANGHAI BOOM FIBER SENSING TECH +1
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Patent Information

Authority / Receiving Office
CN Ā· China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI BOOM FIBER SENSING TECH
Publication Date
2009-12-16
Estimated Expiration
Not applicable Ā· inactive patent

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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.
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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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