Brillouin optical fiber sensing system and sensing method with adjustable frequency shifting structure

An optical fiber sensing system, Brillouin technology, is applied in the direction of using optical devices to transmit sensing components, which can solve the problems of high system cost, complex system structure, and system complexity.

Pending Publication Date: 2018-08-07
GUANGXI NORMAL UNIV
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Problems solved by technology

In traditional BOTDA systems, electro-optic modulators with high extinction ratios and high-frequency microwave signal sources are often used as frequency shifting modules. The system cost is high, and electro-optic modulators with high extinction ratios have temperature drift and instab

Method used

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  • Brillouin optical fiber sensing system and sensing method with adjustable frequency shifting structure
  • Brillouin optical fiber sensing system and sensing method with adjustable frequency shifting structure
  • Brillouin optical fiber sensing system and sensing method with adjustable frequency shifting structure

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[0039] Examples:

[0040] Reference figure 1 , figure 2 , A Brillouin optical fiber sensing system with adjustable frequency shift structure, including

[0041] Narrow linewidth laser 1, first optical coupler 2, optical amplifier 3, scrambler 4, second optical circulator 12, erbium-doped fiber amplifier 5 or EDFA, output end of scrambler 4 and second optical circulator The b end of 12 is connected by sensing fiber 13;

[0042] A signal processing unit 18, which includes a photodetector 14 and a data acquisition processing module 15 connected in sequence, and the input end of the photodetector 14 in the signal processing unit 18 is connected to the c terminal of the second optical circulator 12;

[0043] The signal modulation unit 17 is provided with an electro-optical modulator 11, and the output terminal of the electro-optical modulator 11 in the signal modulation unit 17 is connected to the a terminal of the second optical circulator 12;

[0044] The adjustable frequency shift unit ...

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Abstract

The invention discloses a Brillouin optical fiber sensing system and sensing method with an adjustable frequency shifting structure. The Brillouin optical fiber sensing system is composed of a narrow-linewidth laser device, a first optical coupler, an optical amplifier, a scrambler, a second optical circulator, an erbium-doped fiber amplifier, a signal processing unit, a signal modulating unit, and an adjustable frequency shifting unit. In addition, the method includes: step one, generating continuous light; second two, generating pump light; step three, carrying out a stimulated Brillouin effect; step four, generating backscattered signal light; and step five, carrying out data collection and processing. The system having advantages of low cost and high system stability is capable of realizing distributed measurement of the temperature and strain. The sensing method is operated conveniently; the frequency shift adjustment is carried out conveniently; and the frequency shift is controlled easily. Meanwhile, the frequency modulation module employs the polarization maintaining device, so that the influence on light by the light polarization state is reduced and the obtained optical signal becomes stable.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to a Brillouin optical fiber sensing system and sensing method with an adjustable frequency shift structure. technical background [0002] Optical fiber sensing technology has risen rapidly since the invention of optical fiber in the 1970s. After decades of research and development, it has been widely used in many fields such as optical fiber communication and optical fiber sensing. Due to the advantages of corrosion resistance and anti-electromagnetic interference of the optical fiber sensing system, compared with the traditional electromechanical sensing system, it is more suitable for detecting information in harsh environments, and has the ability of distributed sensing and long-distance sensing, so it has been distributed in recent years. Optical fiber sensing technology has become a research hotspot. [0003] Optical fiber Brillouin optical time-domain analysis technology...

Claims

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Application Information

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IPC IPC(8): G01D5/353
CPCG01D5/353
Inventor 胡君辉张帆岳耀笠杜婧曹雄恒
Owner GUANGXI NORMAL UNIV
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