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Brillouin Spectrum Peak Finding Method Based on Incomplete Spectrum Mosaic

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: 2017-11-03
NANJING UNIV
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  • Abstract
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AI Technical Summary

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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  • Brillouin Spectrum Peak Finding Method Based on Incomplete Spectrum Mosaic
  • Brillouin Spectrum Peak Finding Method Based on Incomplete Spectrum Mosaic
  • Brillouin Spectrum Peak Finding Method Based on Incomplete Spectrum Mosaic

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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]

[0031] In the formula, Ω is the angular frequency; g p is the peak Brillouin gain; Ω B =2πν B is the Brillouin angle frequency shift; ν B is the Brillouin frequency shift; Γ B is the sound wave attenuation coefficient.

[0032] Peak Brillouin gain g p The expression is:

[0033]

[0034] In the formula, n is the refractive index of the fiber core; p l2 is the longitudinal elasto-optic coefficient; c is the speed of light in vacuum; λ p is the wavelength of the incident light; ρ 0 is the density of the fiber material; v A is the velocity of sound waves in the fiber.

[0035] make a=Γ B / 2π, b=ν B , y=g B , rewrite formula (1) as:

[0036]

[0037] In the formula, ν represents the frequency.

[0038] The Lorent...

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Abstract

The invention discloses a Brillouin spectrum peak finding method based on incomplete spectrum splicing. The peak frequency of the real Brillouin spectrum is obtained on the basis of the incomplete spectrum by splicing data after measurement. The invention makes up for the insensitivity of the BOTDR to rapidly changing external disturbances, improves the sensing effect of the BOTDR in extreme environments, and is of great significance to practical engineering applications.

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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Patent Type & Authority Patents(China)
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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