Distributed fiber temperature strain sensing system and method based on Brillouin scattering

A Brillouin scattering, distributed optical fiber technology, applied in thermometers with physical/chemical changes, thermometers, and force measurement by measuring changes in optical properties of materials when they are stressed, which can solve complex installation, temperature and strain. The problems of high demodulation cost and weak detection signal can simplify the test system and eliminate the disturbance of the optical path.

Pending Publication Date: 2017-12-05
SHANDONG UNIV
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Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the invention provides a distributed optical fiber temperature and strain sensing system based on Brillouin scattering, which aims to solve the problem of difficult detection of Brillouin scattering light signals in the prior art, and the detection signal is weak Or the problem of complex installation and high manufacturing cost, and the problem of high cost and inapplicability of temperature and strain adjustment

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  • Distributed fiber temperature strain sensing system and method based on Brillouin scattering
  • Distributed fiber temperature strain sensing system and method based on Brillouin scattering
  • Distributed fiber temperature strain sensing system and method based on Brillouin scattering

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[0027] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0028] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0029] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations the...

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Abstract

The invention discloses a distributed fiber temperature strain sensing system and method based on Brillouin scattering. A distributed feedback laser is adopted to emit continuous light with a narrow linewidth, the light is externally modulated by a photoelectric modulator into pulse light, an erbium doped fiber amplifier is adopted to amplify the pulse light, and then the amplified pulse light enters, as incident light, a sensing fiber so that a Brillouin backward signal in the fiber is obtained. The Brillouin scattering signal is obtained through a single-end input way, so it is convenient to install and use the system. Homologous heterodyne interferometry is adopted to demodulate the signal, thereby avoiding requirements of general interferometry for similarity of luminous intensity of two light beams and simplifying a testing system. Certain measures are taken to enhance the signal, so subsequent processing can be conducted. Meanwhile, changes of Brillouin frequency shift and intensity are obtained through application of an electric method, temperature and strain are demodulated, and temperature and strain are measured at the same time.

Description

technical field [0001] The invention relates to the field of distributed optical fiber sensing, in particular to a distributed optical fiber temperature and strain sensing system and method based on Brillouin scattering. Background technique [0002] A distributed optical fiber sensing system can be defined as an instrument or system that can sense the change of the measured parameter with the direction of the fiber length in the form of a continuous function of distance on a continuous fiber length. The distributed temperature and stress sensing system usually arranges the optical fiber along the temperature field and the stress field, and measures the scattered light carrying temperature and stress information generated when the light is transmitted in the optical fiber. Domain Reflectometer) technology can measure and monitor the temperature, stress spatial distribution and time-varying information along the optical fiber transmission path. [0003] The research on distr...

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Application Information

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IPC IPC(8): G01K11/32G01L1/24G01K11/322
CPCG01K11/32G01L1/242G01K11/322
Inventor 隋青美贾磊李姝凡常天英王静王正方张法业李亦佳田长彬韩明娟
Owner SHANDONG UNIV
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