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High-accuracy distributed optical fiber sensing system based on narrow linewidth high-order Brillouin Stokes wave

A technology of distributed optical fiber and sensing system, which is applied in the direction of using optical devices to transmit sensing components, etc., can solve problems such as limiting detection accuracy, and achieve improved sensing sensitivity, high-precision temperature and strain detection, and narrowed Brillouin Effect of Gain Bandwidth

Inactive Publication Date: 2018-12-18
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] The above schemes provide a narrowing scheme, but they all detect first-order Brillouin Stokes waves, thus limiting the improvement of detection accuracy

Method used

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  • High-accuracy distributed optical fiber sensing system based on narrow linewidth high-order Brillouin Stokes wave
  • High-accuracy distributed optical fiber sensing system based on narrow linewidth high-order Brillouin Stokes wave
  • High-accuracy distributed optical fiber sensing system based on narrow linewidth high-order Brillouin Stokes wave

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Embodiment Construction

[0021] The specific implementation manners of the present invention will be further described below.

[0022] like figure 1 , 2 As shown, a high-precision distributed optical fiber sensing system based on narrow-linewidth high-order Brillouin-Stokes waves described in the present invention includes an adjustable semiconductor laser 1a, a single-frequency semiconductor laser 1b, and a frequency locker 2 , a first polarization controller 3a, a second polarization controller 3b, an acousto-optic modulator 4, a unidirectional fiber amplifier 5a, a bidirectional fiber amplifier 5b, an optical circulator 6, a multi-wavelength narrow-linewidth Brillouin fiber laser 7, which can be Dimming filter 8, photodetector 9, data acquisition card 10; wherein, multi-wavelength narrow-linewidth Brillouin fiber laser 7 is composed of automatically following multi-wavelength narrow-band filter 7a with feedback, sensing fiber 7b, bidirectional erbium-doped It consists of a fiber amplifier 5b and ...

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Abstract

The invention discloses a high-accuracy distributed optical fiber sensing system based on a narrow linewidth high-order Brillouin Stokes wave. The system comprises an adjustable semiconductor laser (1a), a single-frequency semiconductor laser (1b), a frequency locking device (2), a first polarization controller (3a), a second polarization controller (3b), an acousto-optic modulator (4), a one-wayoptical fiber amplifier (5a), a bidirectional optical fiber amplifier (5b), an optical circulator (6), a multi-wavelength narrow linewidth Brillouin optical fiber laser (7), an adjustable optical filter (8), a photoelectric detector (9) and a data collection card (10), wherein the multi-wavelength narrow linewidth Brillouin optical fiber laser (7) consists of an automatic following multi-wavelength narrow-band filter (7a), a sensing optical fiber (7b), a bidirectional Er-doped optical fiber amplifier (5b) and a Faraday polariscope (7c). The system is reasonable in design, the multi-wavelengthnarrow linewidth Brillouin optical fiber laser is used, and a high-order Brillouin Stokes wave frequency shift amount is detected to realize high-accuracy temperature and strain detection.

Description

technical field [0001] The invention relates to a Brillouin distributed optical fiber sensing system, specifically a high-precision Brillouin distributed optical fiber sensing system based on high-order Brillouin Stokes waves, including a semiconductor laser, a frequency locker, a polarization control device, acousto-optic modulator, erbium-doped fiber amplifier, optical circulator, sensing fiber, tunable optical filter, photodetector, data acquisition card. Background technique [0002] Distributed optical fiber sensing has significant continuity advantages, that is, only one optical fiber can accurately sense information at any point on the optical fiber. It has received more and more research and attention from researchers, and has been widely used in communications, transportation, National defense, civil engineering, electric power and other important fields. [0003] Among them, the distributed optical fiber sensing of Brillouin scattering has better performance in te...

Claims

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Application Information

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IPC IPC(8): G01D5/353
CPCG01D5/353
Inventor 刘毅商瑶易小刚
Owner TAIYUAN UNIV OF TECH
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