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Sensing device based on Raman-Brillouin distributed temperature and stress dual-parameter detection

A sensing device and distributed technology, applied in measurement devices, thermometers, and measurement of force by measuring the change of optical properties of materials when they are stressed, can solve the problem of inability to simultaneously and accurately obtain dual parameters of temperature and stress, and achieve Accurately obtained effect

Active Publication Date: 2016-12-21
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0010] Aiming at the defects of the prior art, the purpose of the present invention is to provide a sensing device based on Raman-Brillouin distributed temperature and stress dual-parameter detection, aiming to solve the problem that the Brillouin system cannot simultaneously and accurately acquire the dual parameters of temperature and stress. parameter problem

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  • Sensing device based on Raman-Brillouin distributed temperature and stress dual-parameter detection
  • Sensing device based on Raman-Brillouin distributed temperature and stress dual-parameter detection

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specific Embodiment approach

[0046] (1) According to the needs, reasonably select the appropriate sensing technology, including but not limited to ROTDR-BOTDR / A, ROTDR-BOCDR / A, etc., and build the corresponding system according to the adopted technology. What the embodiment adopts is ROTDR-BOTDR. The embodiment uses a seven-core optical fiber containing six eccentric cores.

[0047] (2) build as figure 2 Example system shown. The light output by the narrow-linewidth laser 1 is divided into two paths by the first coupler 2: the upper path passes through the polarization controller 3, the semiconductor optical amplifier 5 and is controlled by the pulse generator 4, the erbium-doped fiber amplifier 6, and the band-pass filter. 7, etc., are used to generate probe light; the light beam is divided into two paths again through the second coupler 8, and the upper path passes through the second circulator 13, fans into the third coupler 11 and enters the outer core of the multi-core light 12, for Raman scatter...

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Abstract

The invention discloses a sensing device based on Raman-Brillouin distributed temperature and stress dual-parameter detection. The sensing device is composed of a laser, a first coupler, a polarization controller, a pulse generator, a semiconductor optical amplifier, an erbium-doped fiber amplifier, a band-pass filter, a second coupler, an optical attenuator, a first circulator, a third coupler, a multi-core fiber, a second circulator, a Raman filter, a first d photoelectric detector, a second photoelectric detector, an oscilloscope, a polarization controller, a modulator, a microwave generator, a polarization switch, a fourth coupler, a third photoelectric detector, a power spectrum analyzer and a data processing module. Because a spatial-division multiplexing system is formed by using a single-mode multi-core fiber, a problem of mode coupling of a mode -division multiplexing system and power mismatching of a wavelength-division multiplexing system can be solved and thus an effect of precise and simultaneous temperate and stress obtaining can be realized.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and more specifically relates to a sensing device based on Raman-Brillouin distributed temperature and stress dual-parameter detection. Background technique [0002] Compared with traditional sensors, fiber optic sensors have the advantages of small size, wide frequency band, high sensitivity, no electromagnetic interference, corrosion resistance, high temperature resistance, high pressure resistance, and adaptability to harsh environments. It is precisely because of these characteristics that fiber optic sensing has always been highly valued by relevant academic circles and research institutions in various countries. Since the last century, more than a hundred kinds of fiber optic sensors have been developed. It has been proven that fiber optic sensors can detect more than 70 physical quantities such as strain, displacement, pressure, speed, acceleration, torque, angular velocity,...

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Application Information

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IPC IPC(8): G01K11/32G01L1/24G01K11/322G01K11/324
CPCG01K11/32G01L1/246G01K11/324G01K11/322
Inventor 唐明党云丽赵志勇段丽王萌吴昊
Owner HUAZHONG UNIV OF SCI & TECH
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