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Optical fiber distributed sensing method and device based on multi-wavelength dual optical pulses

A technology of optical fiber distributed and sensing devices, which is applied in the direction of transmitting sensing components, measuring devices, and converting sensor outputs with optical devices, which can solve the problem of increasing the workload of back-end signal processing and failing to meet the requirements of real-time measurement of distributed vibration problems, to achieve the effect of suppressing the deterioration of detection noise, eliminating detection blind spots, and high signal-to-noise ratio

Active Publication Date: 2021-07-09
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

This process greatly increases the workload of back-end signal processing, which cannot meet the requirements of distributed vibration real-time measurement
At the same time, the above methods are only applicable to the Ф-OTDR technology based on coherent detection

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  • Optical fiber distributed sensing method and device based on multi-wavelength dual optical pulses
  • Optical fiber distributed sensing method and device based on multi-wavelength dual optical pulses
  • Optical fiber distributed sensing method and device based on multi-wavelength dual optical pulses

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0040] like figure 1 As shown, the optical fiber distributed sensing method based on multi-wavelength dual optical pulses in this embodiment, the steps are: S1. Generate multi-wavelength dual optical pulses, and inject the multi-wavelength dual optical pulses into the sensing fiber, and the multi-wavelength dual optical pulses Each pulse in contains multiple wavelength components; S2. Obtain the Rayleigh optical signal in the sensing fiber and the interference light intensity of the sensing channel corresponding to the Rayleigh optical signal; S3. Calculate the interference light intensity to obtain the Rayleigh optical signal The phase information of the optical signal is used to obtain the information of the signal sensed by the sensing fiber.

[0041] In thi...

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Abstract

The invention discloses an optical fiber distributed sensing method and device based on multi-wavelength dual-light pulses. The method includes the following steps: S1. generating multi-wavelength dual-light pulses, and injecting the multi-wavelength dual-light pulses into a sensing fiber, Each pulse in the multi-wavelength dual optical pulses contains multiple wavelength components; S2. Obtain the Rayleigh optical signal in the sensing fiber, and the interference light intensity of the sensing channel corresponding to the Rayleigh optical signal; S3. Calculate the intensity of the interference light to obtain the phase information of the Rayleigh optical signal, so as to obtain the information of the signal sensed by the sensing fiber. The invention has the Ф‑OTDR technology that can be used based on the PGC phase demodulation technology, reduces the influence of the Rayleigh fiber signal strength fading on the measurement noise without increasing the signal processing workload, and eliminates the detection blind area caused by high phase noise. Etc.

Description

technical field [0001] The invention relates to optical fiber distributed sensing technology, in particular to an optical fiber distributed sensing method and device based on multi-wavelength dual optical pulses, especially suitable for vibration or sound detection. Background technique [0002] Phase-sensitive optical time domain reflectometer technology (Ф-OTDR) is widely used in applications such as distributed vibration and sound detection, and has great application value. The phase-sensitive optical time domain reflectometer injects optical pulses into the sensing optical fiber, and collects the Rayleigh optical signals generated by the optical pulses at various positions in the optical fiber. The phase information of the Rayleigh signal is obtained by using the intensity change of the Rayleigh signal to realize the information of the external vibration signal. [0003] In order to obtain the phase information of the Rayleigh signal, Yuelan Lu et al. proposed a Ф-OTDR ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00G01D5/353
CPCG01D5/35319G01H9/004
Inventor 路阳张学亮孟洲梁朝里王建飞陈伟陈默胡晓阳彭承彦楼康
Owner NAT UNIV OF DEFENSE TECH
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