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Brillouin-scattering-based distributed measurement system and method

A Brillouin scattering and measurement system technology, applied in the field of distributed measurement systems based on Brillouin scattering, can solve the problems of low measurement accuracy and long response time

Active Publication Date: 2014-04-02
CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD +1
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Problems solved by technology

[0006] Based on this, it is necessary to provide a distributed measurement system and method based on Brillouin scattering for the problems of long response time and low measurement accuracy

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Embodiment Construction

[0038] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0039] It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes ...

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Abstract

The invention discloses a Brillouin-scattering-based distributed measurement system, which comprises a first laser unit capable of splitting a laser beam into locally-oscillated light and pump light, a second laser unit capable of modulating laser into an orthogonal frequency division multiplexing light signal which can be used as detection light, a non-coaxial multi-core optical fiber and an optical fiber sensing unit, wherein one end of the non-coaxial multi-core optical fiber is used for receiving the pump light from the first laser unit, and the other end of the non-coaxial multi-core optical fiber is used for receiving the orthogonal frequency division multiplexing light signal; the optical fiber sensing unit is connected with the first and second laser units respectively. According to the Brillouin-scattering-based distributed measurement system, the non-coaxial multi-core optical fiber is used as a sensing optical fiber instead of a single-mode single-core optical fiber, so that the cross sensitivity of temperature and stress can be distinguished; the orthogonal frequency division multiplexing light signal is used as the detection light in the system instead of single-beam laser, so that the scanning speed can be increased, a plurality of frequency points can be scanned at one time, and detection response is quickened. The invention also provides a Brillouin-scattering-based distributed measurement method.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a distributed measurement system and method based on Brillouin scattering. Background technique [0002] In the power system, cables, wind power equipment, etc. are exposed to the air for a long time, and are easily affected by external forces and changes in the external environment. For example, strong winds, earthquakes and ice disasters will cause deformation of the equipment and sag, which will lead to stress and strain, reduce the strength of the equipment, and cause line interruption and failure. The impact of stress on equipment cannot be shown intuitively. Once the stress accumulates to a certain extent, the work of the equipment will be interrupted, which will seriously affect the safety of power transmission and power supply in the power system. On the other hand, in the power system, high temperature and fire are also common accidents that affect the saf...

Claims

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Application Information

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IPC IPC(8): G01K11/32G01L1/24G01K11/322
Inventor 黄琦程小蓉吴钟博吴劲松张斌蒋康明吴赞红
Owner CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD
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