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Brillouin optical coherent reflectometer based on noise modulation

A noise modulation and optical coherence technology, applied to instruments, measuring devices, etc., can solve the problems of not being able to balance spatial resolution and measurement distance, and achieve the effects of short measurement time, simple operation, and extended measurement distance

Active Publication Date: 2015-05-27
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0005] In order to solve the problem that the existing distributed optical fiber sensing system based on Brillouin scattering cannot take into account both spatial resolution and measurement distance, the present invention provides a Brillouin optical coherent reflectometer based on noise modulation

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  • Brillouin optical coherent reflectometer based on noise modulation

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Embodiment Construction

[0012] A Brillouin optical coherent reflectometer based on noise modulation, comprising a noise signal source 1, a distributed feedback semiconductor laser 2, a first fiber coupler 3, a first optical amplifier 4, an optical circulator 5, a sensing fiber 6, A second optical amplifier 7, a tunable optical filter 8, a variable optical delay line 9, a third optical amplifier 10, a second optical fiber coupler 11, a photodetector 12, a signal processing and display device 13;

[0013] Wherein, the output end of the noise signal source 1 is connected to the input end of the distributed feedback semiconductor laser 2 through a high-frequency coaxial cable; the output end of the distributed feedback semiconductor laser 2 is connected to the input end of the first fiber coupler 3;

[0014] The first output end of the first optical fiber coupler 3 is connected with the input end of the first optical amplifier 4 through a single-mode fiber jumper; the output end of the first optical ampli...

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Abstract

The invention relates to a distributed optical fiber sensing system, in particular to a Brillouin optical coherent reflectometer based on noise modulation, and solves the problem that existing distributed optical fiber sensing systems based on Brillouin scattering cannot give consideration to both the spatial resolution and the measuring distance. The Brillouin optical coherent reflectometer based on noise modulation comprises a noise signal source, a distributed feedback semiconductor laser unit, a first optical fiber coupler, a first optical amplifier, an optical circulator, a sensing optical fiber, a second optical amplifier, a tunable optical filter, a variable optical delay line, a third optical amplifier, a second optical fiber coupler, a photoelectric detector as well as a signal processing and display device, wherein an output end of the noise signal source is connected with an input end of the distributed feedback semiconductor laser unit through a high-frequency coaxial cable, and an output end of the distributed feedback semiconductor laser unit is connected with an input end of the first optical fiber coupler. The Brillouin optical coherent reflectometer is applicable to the field of distributed optical fiber sensing.

Description

technical field [0001] The invention relates to a distributed optical fiber sensing system, in particular to a Brillouin optical coherent reflector based on noise modulation. Background technique [0002] Distributed optical fiber sensing system refers to the system that uses optical fiber as sensing element and transmission element at the same time, which can realize the measurement of temperature and strain at different positions along the length of the entire optical fiber. At present, distributed optical fiber sensing systems can be divided into the following three types: distributed optical fiber sensing systems based on Rayleigh scattering, distributed optical fiber sensing systems based on Raman scattering, 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 over the other two distributed optical fiber sensing systems due to its me...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/02
Inventor 张明江柴晶刘毅王云才
Owner TAIYUAN UNIV OF TECH
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