A Peak Finding Method of Brillouin Spectrum Based on Incomplete Spectrum

A Brillouin frequency shift and incomplete technology, applied in the field of BOTDR measurement, can solve the problem of not being able to obtain the strain information along the high-speed rail, and achieve the effect of making up for insensitivity and improving the sensing effect

Active Publication Date: 2016-08-24
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the incomplete spectrum cannot determine the correct peak frequency of the Brillouin spectrum through Lorenz curve fitting, the system cannot obtain the strain information along the high-speed rail at this time, and cannot screen out the damaged sound barrier in time

Method used

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  • A Peak Finding Method of Brillouin Spectrum Based on Incomplete Spectrum
  • A Peak Finding Method of Brillouin Spectrum Based on Incomplete Spectrum
  • A Peak Finding Method of Brillouin Spectrum Based on Incomplete Spectrum

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0031] It is known that the Brillouin spectrum is in the form of a Lorentz curve, and its expression is transformed, specifically:

[0032] The expression of the Brillouin spectrum is:

[0033] g B ( Ω ) = g p ( Γ B / 2 ) 2 ( Ω - Ω B ) 2 + ( Γ B ...

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Abstract

The invention discloses a Brillouin frequency spectrum peak searching method based on incomplete spectra. According to the practical BOTDR engineering application background, data are processed after measurement is conducted, and thus the real peak frequency of Brillouin frequency spectra is obtained based on the incomplete spectra. By means of the Brillouin frequency spectrum peak searching method, the insensitivity of a BOTDR on external interference which changes quickly is compensated for, the sensing effect of the BOTDR under the extreme environment is improved, and great significance on the practical engineering application is achieved.

Description

technical field [0001] The invention relates to a peak-seeking method of Brillouin spectrum based on incomplete spectrum, which belongs to the field of BOTDR measurement. Background technique [0002] With the wide application of major projects such as bridges, tunnels, and dams, it is necessary to monitor their safety, which is conducive to the early detection of potential safety hazards in the project and the effect of disaster prevention and mitigation. Due to the long distance, large scope and complex structure of this kind of project, the traditional detection technology is not suitable for it. Distributed optical fiber sensing technology based on optical time domain reflectometer (BOTDR) technology can measure various physical quantities such as temperature and strain, and has the advantages of high spatial resolution, long sensing distance and high precision. widespread attention. [0003] Brillouin scattering is caused by the interaction between the optical field i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353
Inventor 焦文祥李密张旭苹宋跃江路元刚刘吴先之
Owner NANJING UNIV
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