Distributed optical fiber vibration sensor for enhancing long-distance detection, and method of distributed optical fiber vibration sensor

A distributed optical fiber and vibration sensor technology, applied in instruments, measuring devices, measuring ultrasonic/sonic/infrasonic waves, etc., can solve problems such as safety and inability to accurately locate laser transmission power, and achieve improved signal-to-noise ratio and improved vibration measurement Accuracy, the effect of increasing the measurement distance

Inactive Publication Date: 2015-05-06
SHANGHAI BOOM FIBER SENSING TECH
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AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the existing distributed optical fiber vibration sensing device cannot achieve accurate positioning during ultra-long-distance measurement and the power safety problem of laser transmission, the present invention provides a distributed optical fiber vibration sensor that can enhance long-distance detection

Method used

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  • Distributed optical fiber vibration sensor for enhancing long-distance detection, and method of distributed optical fiber vibration sensor
  • Distributed optical fiber vibration sensor for enhancing long-distance detection, and method of distributed optical fiber vibration sensor

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Embodiment Construction

[0034] This embodiment provides a distributed optical fiber vibration sensor based on optical fiber relay and a sensing method thereof. The present invention will be described in detail below with reference to the accompanying drawings.

[0035] The remote distributed optical fiber vibration sensor includes a demodulator and a transmission cable, and the demodulator includes: a narrow linewidth light source 1, an electro-optic modulator 2, a narrow pulse driver 3, an optical amplifier 4, an optical fiber circulator 5, and a polarization beam splitter 6. First optical receiving module 7, second optical receiving module 8, dual-channel AD collector 9, vibration signal analysis and processing system 10, remote optical fiber relay G, optical passive module 14, 2×2 optical fiber coupler 11 , fiber isolator 12, fiber circulator 13, power supply 18.

[0036] The output end of the narrow linewidth light source 1 is connected to the input end of the electro-optic modulator 2, the outpu...

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Abstract

The invention discloses a distributed optical fiber vibration sensor for enhancing long-distance detection, and a method of the distributed optical fiber vibration sensor, and belongs to the technical field of optical fiber vibration sensing. The system comprises a light source, an electro-optic modulator, a pulse driver, an active optical amplifier, a circulator, a polarizing beam splitter, a collector, and a signal analysis and processing system. The system characterized by further comprising a far-end optical relay. The far-end optical relay is embedded between multistage sensing optical fibers, optical fiber losses are avoided by using gains of the far-end optical relay, the strength of spontaneous Rayleigh scattered light in the optical fibers is enhanced, a signal to noise ratio of the distributed optical fiber vibration sensor system is increased, the transmission distance of the distributed optical fiber vibration sensor system is increased, and measuring accuracy of the vibration in a target area is improve; and meanwhile, safety hazards caused by highlight power pump light are avoided.

Description

[0001] technical field [0002] The invention relates to the field of distributed optical fiber vibration sensing, in particular to a distributed optical fiber vibration sensor capable of enhancing long-distance detection. The invention also relates to a vibration sensing method of a distributed optical fiber vibration sensor capable of enhancing long-distance detection. Background technique [0003] Sensing and alarm systems such as perimeter security, border protection, pipeline anti-sabotage, 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. detection and analysis. With the development of optical devices and optical communication technology, more and more optical fiber sensing technology is used in the field of sensing, gradually replacing some traditional electrical sensors. [0004] At present, distributed optical fiber sensing technology is the most promising in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
Inventor 黄正杨斌
Owner SHANGHAI BOOM FIBER SENSING TECH
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