A 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 the problems of reduced system resolution, poor signal-to-noise signal of Brillouin scattering, and weak power. Achieve the effect of small optical transmission loss, enhance the Brillouin effect, and solve the problem of cross sensitivity
CN102980681BActive Publication Date: 2015-11-11JINAN UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JINAN UNIVERSITY
Publication Date
2015-11-11

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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.
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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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