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Distributed strain and temperature optical fiber sensor based on brillouin scattering

A distributed strain and Brillouin scattering technology, which is applied to thermometers, thermometers, instruments, etc. that change physically/chemically, can solve problems such as weak power, reduced system resolution, and poor signal-to-noise signal of Brillouin scattering. Achieve the effect of small optical transmission loss, enhance the Brillouin effect, and solve the problem of cross sensitivity

Active Publication Date: 2013-03-20
JINAN UNIVERSITY
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Problems solved by technology

For photonic crystal fibers based on air holes, the air holes suppress the acousto-optic effect of backscattering to a certain extent, so the Brillouin peak generated by the optical field distributed in the glass core In addition to being strong, the power of other Brillouin peaks is very weak, and the signal-to-noise ratio of the measured Brillouin scattering signal is poor, which reduces the resolution of the system

Method used

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  • Distributed strain and temperature optical fiber sensor based on brillouin scattering
  • Distributed strain and temperature optical fiber sensor based on brillouin scattering
  • Distributed strain and temperature optical fiber sensor based on brillouin scattering

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Embodiment

[0021] Such as figure 1 As shown, a distributed strain and temperature optical fiber sensor based on Brillouin scattering disclosed in this embodiment includes a narrow linewidth laser light source 1, an electro-optic modulator 3, a first erbium-doped fiber amplifier 4, a second erbium-doped fiber Amplifier 12, circulator 5, first optical coupler 2, second optical coupler 13, double-balanced detector 9, signal processing system 10, sensing fiber 7 and pulse signal source 11, wherein the sensor used in this embodiment The optical fiber 7 is an all-solid photonic crystal bandgap fiber, and a long-period fiber grating 6 is written in the all-solid photonic crystal bandgap fiber. The sensing fiber 7 of this embodiment can also use other cladding mode transmission losses to be small, and An optical fiber in which the cladding and core materials respond differently to temperature and strain.

[0022] The light source 1 is connected to the input end of the first optical coupler 2, a...

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Abstract

The invention discloses a distributed strain and temperature optical fiber sensor based on brillouin scattering. The sensor comprises a light source, an electro-optical modulator, a pulse signal source, a first erbium-doped optical fiber amplifier, a second erbium-doped optical fiber amplifier, a circulator, a first optical coupler, a second optical coupler, double balance detectors, a signal processing system and a sensing optical fiber. The sensing optical fiber comprises a long period optical fiber grating and is an all-solid photonic crystal band gap optical fiber. Output light of the light source is divided into two paths, wherein one path of the output light is modulated to be detection pulse light by means of the electro-optical modulator, is amplified through the erbium-doped optical fiber amplifiers and is input into the sensing optical fiber through the circulator. The sensor can simultaneously obtain temperature and strain with high resolution through a single measurement, and can well solve the problem of cross sensitivity existing in measurement of a brillouin sensor.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to a distributed strain and temperature optical fiber sensor based on Brillouin scattering. Background technique [0002] Brillouin scattering is a light scattering process caused by the interaction between light waves and sound waves propagating in optical fibers. There is a certain frequency difference between Brillouin scattering and incident light, and the frequency difference has good linearity with temperature and strain. relationship, while its power is proportional to temperature. As a sensing medium, optical fiber has the advantages of small size, light weight, anti-electromagnetic interference, and easy networking. Distributed sensing of temperature and strain in the environment can be realized by measuring the Brillouin spectrum in the optical fiber, which has received more and more attention in the sensing of buildings such as bridges, tunnels, reservoirs,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G01B11/16G01K11/322
Inventor 梁浩李杰程凌浩关柏鸥
Owner JINAN UNIVERSITY
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