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Sensitivity adjustable distributed fiber sensing system based on high-order Stokes waves

A distributed optical fiber and sensing system technology, which is applied in the direction of transmitting sensing components, converting sensor output, and measuring devices with optical devices, can solve the problems of inability to adjust, low detection sensitivity, etc., and achieve the effect of reasonable structure and ingenious design

Active Publication Date: 2016-07-20
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0003] In order to solve the problem that the detection sensitivity of the existing distributed optical fiber sensing system is low and cannot be adjusted, the present invention provides a sensitivity-adjustable distributed optical fiber sensing system based on high-order Stokes waves

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  • Sensitivity adjustable distributed fiber sensing system based on high-order Stokes waves

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Embodiment Construction

[0013] Sensitivity-tunable distributed optical fiber sensing system based on high-order Stokes waves, including tunable single-frequency laser 1a, semiconductor laser 1b, phase-locked loop 2, first polarization controller 3a, second polarization controller 3b, electro-optic Modulator 4, unidirectional erbium-doped fiber amplifier 5a, optical circulator 6, tunable optical filter 7, photodetector 8, data acquisition card 9, resonant cavity;

[0014] The resonant cavity includes a bidirectional erbium-doped fiber amplifier 5b, a first bidirectional optical splitter 10a, a second bidirectional optical splitter 10b, and a single-mode sensing fiber 11;

[0015] Wherein, the signal input end of the adjustable single-frequency laser 1a and the signal input end of the semiconductor laser 1b are connected through a phase-locked loop 2; the outgoing end of the adjustable single-frequency laser 1a is connected to the incident end of the first polarization controller 3a; The outgoing end o...

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Abstract

The invention relates to a sensitivity adjustable distributed fiber sensing system based on high-order Stokes waves, belongs to a distributed fiber sensing system, and solves the problem that the detection sensitivity of a present distributed fiber sensing system is low and cannot be adjusted. The sensitivity adjustable distributed fiber sensing system based on high-order Stokes waves comprises an adjustable single-frequency laser, a semiconductor laser, a phase-locked loop, a first polarization controller, a second polarization controller, an electro-optical modulator, a unidirectional erbium doped fiber amplifier, a light circulator, an adjustable optical filter, a photoelectric detector, data collection card and a resonant cavity; and the resonant cavity further comprises a bidirectional erbium doped fiber amplifier, a first bidirectional optical demultiplexer, a second bidirectional optical demultiplexer and a single-mode sensing fiber. The system of the invention is suitable for the distributed fiber sensing field.

Description

technical field [0001] The invention relates to a distributed optical fiber sensing system, in particular to a sensitivity-adjustable distributed optical fiber sensing system based on high-order Stokes waves. Background technique [0002] Distributed optical fiber sensing system has been widely used in communication, transportation, national defense, civil engineering, electric power and other fields because of its remarkable continuity advantages (that is, only one optical fiber can accurately sense the information at any point on the optical fiber). The existing distributed optical fiber sensing systems are mainly divided into three types: distributed optical fiber sensing systems based on Rayleigh scattering, distributed optical fiber sensing systems based on Raman scattering, and distributed optical fiber sensing systems based on Brillouin scattering. system. Among them, the distributed optical fiber sensing system based on Brillouin scattering has obvious advantages co...

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Application Information

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IPC IPC(8): G01D5/353
CPCG01D5/35364
Inventor 刘毅张明江张建忠王云才
Owner TAIYUAN UNIV OF TECH
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