Ultra-long-distance high-spatial-resolution Raman fiber dual-parameter sensing system and method

A high spatial resolution, Raman optical fiber technology, applied in the direction of measuring heat, measuring devices, thermometers with physical/chemical changes, etc., can solve the problem that the measurement accuracy is greatly affected, the spatial resolution is difficult to break through 1m, and the sensing distance is difficult Break through 100km and other problems to achieve the effect of improving the signal-to-noise ratio of the system

Active Publication Date: 2022-05-13
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0005] In order to solve the problem that the spatial resolution of the existing distributed optical fiber Raman sensing system is difficult to exceed 1m, the sensing distance is difficult to exceed 100km, the measurement accuracy is greatly affected by the outside world, and the system cannot simultaneously realize the continuous distributed measurement of the two parameters of temperature and strain In view of the technical difficulties, the present invention proposes a distributed optical fiber Raman sensing device and method based on the fusion of differential pulse laser and chaotic laser, so as to realize the simultaneous collaborative monitoring of the two parameters of temperature and strain along the optical fiber, and realize the 100km Millimeter-level spatial resolution measurements along long-distance optical fibers

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  • Ultra-long-distance high-spatial-resolution Raman fiber dual-parameter sensing system and method
  • Ultra-long-distance high-spatial-resolution Raman fiber dual-parameter sensing system and method

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Embodiment 1

[0039] Embodiment 1 of the present invention provides an ultra-long-distance high-spatial-resolution Raman fiber dual-parameter sensing system, which is based on the measurement principle of differential pulse laser combined with chaotic laser modulation, which can realize long sensing distance and high spatial resolution , Measurement results with high measurement accuracy.

[0040] Such as figure 1 As shown, an ultra-long-distance high-spatial resolution Raman fiber dual-parameter sensing system provided by Embodiment 1 of the present invention includes a pulsed laser source 1, a chaotic laser source 2, a first optical switch 3, an isolator 4, Semiconductor optical amplifier 5, pulse erbium-doped fiber amplifier 6, first coupler 7, second coupler 8, wavelength division multiplexer 9, second optical switch 10, first semiconductor laser 11, second semiconductor laser 12, the first Three optical fiber coupler 13, the fourth optical fiber coupler 14, sensing fiber 15, first pho...

Embodiment 2

[0084] Embodiment 2 of the present invention provides a sensing method for an ultra-long-distance high-spatial-resolution Raman optical fiber dual-parameter sensing system described in Embodiment 1.

[0085] Including the step of strain measurement and the step of temperature measurement, wherein, the step of temperature measurement is:

[0086] S101. Through the first optical switch 3, the pulsed laser light output by the pulsed laser source with a pulse width of M is controlled to enter the second coupler 8, and then enter the sensing fiber through the wavelength division multiplexer 9 in sequence, and use the first photoelectric The detector 16 receives the anti-Stokes light output from the sensing fiber; then, the second optical switch 10 is changed so that the next pulse is injected from the other end of the sensing fiber, and the first photodetector 16 is used to receive the light again. Anti-Stokes light output from the sensing fiber;

[0087] S102. Change the pulse wi...

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Abstract

The invention belongs to the technical field of distributed optical fiber sensing, and specifically relates to an ultra-long-distance high-spatial-resolution Raman optical fiber dual-parameter sensing system and method. The system includes a pulsed laser source and a chaotic laser source, and the chaotic laser source and the described The input end of the first coupler is connected, the output end of the first coupler is respectively connected with an input end of the second coupler and the second photodetector, and the output end of the pulsed laser source is connected with the other input end of the second coupler , the output end of the second coupler is connected to the first port of the wavelength division multiplexer, the second port of the wavelength division multiplexer is connected to the input end of the second optical switch, and the two output ends of the second optical switch are respectively connected to The two ends of the sensing fiber are connected, and the third port of the wavelength division multiplexer is connected to the first photodetector; the present invention uses chaotic pulsed laser and two kinds of pulsed lasers with different pulse widths in the sensing fiber to generate antisto X-ray, calculate temperature and strain information, improve the sensing distance and spatial resolution.

Description

technical field [0001] The invention belongs to the technical field of distributed optical fiber sensing, and specifically relates to an ultra-long-distance high-spatial resolution Raman optical fiber dual-parameter sensing system and method, which is based on chaotic pulse laser and differential pulse laser for measurement, and has long distance, High spatial resolution and high measurement accuracy. Background technique [0002] The distributed optical fiber Raman sensing system can realize continuous distributed temperature monitoring, and has the advantages of anti-electromagnetic interference, anti-corrosion, electrical insulation, high sensitivity, fire and explosion protection, etc. In the sensing fiber, two kinds of Raman scattering signals, Stokes light and anti-Stokes light, are generated when the pulsed laser propagates in the fiber. Among them, the anti-Stokes signal is more susceptible to the influence of temperature. more sensitive to temperature. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/324
CPCG01K11/32
Inventor 张明江王晨懿李健许扬周新新冯凯尹子彤
Owner TAIYUAN UNIV OF TECH
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