Brillouin spectrum peak finding method based on incomplete spectrum splicing

A incomplete and spectral technology, applied in the field of BOTDR measurement, can solve the problem of inability to obtain strain information along the high-speed railway, and achieve the effect of compensating for insensitivity and improving the sensing effect.

Active Publication Date: 2015-07-29
NANJING UNIV
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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 sy

Method used

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  • Brillouin spectrum peak finding method based on incomplete spectrum splicing
  • Brillouin spectrum peak finding method based on incomplete spectrum splicing
  • Brillouin spectrum peak finding method based on incomplete spectrum splicing

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0029] It is known that the Brillouin spectrum is in the form of a Lorenz curve, and its expression is:

[0030] g B ( Ω ) = g p ( Γ B / 2 ) 2 ( Ω - Ω B ) 2 + ( Γ B / 2 ) ...

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Abstract

The invention discloses a Brillouin spectrum peak finding method based on incomplete spectrum splicing. The method comprises performing splicing treatment on measured data, and on the basis of incomplete spectra, obtaining the peak frequency of real Brillouin spectra. The Brillouin spectrum peak finding method based on incomplete spectrum splicing remedies the insensitivity of a BOTDR (Brillouin optical time domain reflectometer) to rapidly-changed external interference, improves the sensing effects of the BOTDR in extreme environments and is significant to practical engineering application.

Description

technical field [0001] The invention relates to a Brillouin spectrum peak-finding method based on incomplete spectrum splicing, 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 f...

Claims

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Application Information

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IPC IPC(8): G01L1/24
Inventor 李密焦文祥张旭苹宋跃江路元刚王峰
Owner NANJING UNIV
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