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Brillouin scattering based distributive fiber sensing system

A Brillouin scattering and distributed optical fiber technology, applied in the field of fiber lasers and optical fiber sensing, can solve problems such as poor measurement accuracy, and achieve the effects of simple devices, reduced complexity, and cost savings

Inactive Publication Date: 2011-02-16
HUAZHONG UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

In recent years, H.H.Kee and T.P.Newson have improved the spatial resolution to within tens of centimeters by measuring the ratio of the Rayleigh signal to the Brillouin signal (Landau-Placzek Ratio), but the measurement accuracy achieved Relatively poor

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  • Brillouin scattering based distributive fiber sensing system
  • Brillouin scattering based distributive fiber sensing system
  • Brillouin scattering based distributive fiber sensing system

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] figure 1 It is a structural schematic diagram of the optical fiber sensing system based on Brillouin scattering of the present invention. The optical fiber sensing system includes a Brillouin fiber ring laser A and a distributed Brillouin fiber sensor B. The remaining pumping light output by the Brillouin fiber ring laser is input into the distributed Brillouin fiber sensor as detection light, and the output laser is used as the local oscillator light of the distributed Brillouin fiber sensor. The detection light is input into the sensing fiber of the distributed Brillouin fiber sensor, and the backscattered light containing temperature and strain information is obtained, which is mixed with the local oscillator light to obtain the required temperature and strain information.

[0029] The Brillouin fiber ring laser A include...

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Abstract

The invention relates to a Brillouin scattering based distributive fiber sensing system which comprises a Brillouin fiber annular laser A and a distributive Brillouin fiber sensor B, wherein surplus pump light output by the Brillouin fiber annular laser A is used as detection light input into the distributive Brillouin fiber sensor B; laser output by the Brillouin fiber annular laser A is used as local oscillation light of the distributive Brillouin fiber sensor B; the detection light is input into the distributive Brillouin fiber sensor B to obtain back Brillouin scattered light containing temperature and stain information; and the back Brillouin scattered light is mixed with the local oscillation light to obtain the required temperature and stain information. The Brillouin scattering based distributive fiber sensing system has simple and stable structure and can be used for simultaneously measuring the temperature and the stain with a longer distance.

Description

technical field [0001] The invention belongs to the field of optical fiber laser and optical fiber sensing, in particular to a distributed optical fiber sensing system. Background technique [0002] The Brillouin fiber ring laser generates laser light by placing the fiber in the resonant cavity and using the Brillouin gain in the fiber. The Brillouin fiber ring laser has the advantages of narrow linewidth, stable frequency, and sensitive gain direction, so it has been a hot research topic. And it is widely used in the following aspects: distributed temperature and pressure sensors; narrow-band amplifiers; microwave frequency generators; frequency shifters. [0003] At present, a lot of very meaningful work has been carried out at home and abroad on fiber lasers based on stimulated Brillouin scattering, and many schemes have been proposed, such as conventional Brillouin fiber ring lasers, same-cavity Brillouin fiber ring lasers, unbalanced Brillouin fiber ring laser, erbium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G01B11/16G01K11/322
Inventor 孙军强唐健冠吴奇
Owner HUAZHONG UNIV OF SCI & TECH
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