Fiber distributed sensing method and device based on multi-wavelength double light pulses

An optical fiber distribution and sensing method technology, which is applied in the direction of using optical devices to transmit sensing components, measuring devices, converting sensor outputs, etc., can solve the problem of inability to meet the requirements of distributed vibration real-time measurement and increase the workload of back-end signal processing, etc. To achieve the effect of suppressing the deterioration of detection noise, eliminating detection blind spots, and reducing the impact of measurement noise

Active Publication Date: 2018-09-07
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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  • Fiber distributed sensing method and device based on multi-wavelength double light pulses
  • Fiber distributed sensing method and device based on multi-wavelength double light pulses
  • Fiber distributed sensing method and device based on multi-wavelength double light 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] Such as 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 ...

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Abstract

The invention discloses a fiber distributed sensing method and device based on multi-wavelength double light pulses, and the method comprises the following steps: S1, generating multi-wavelength double light pulses and injecting the multi-wavelength double light pulses into a sensing fiber, each of the multi-wavelength double light pulses comprising a plurality of wavelength components; S2. obtaining a Rayleigh optical signal in the sensing fiber, and the interference light intensity of the sensing channel corresponding to the Rayleigh optical signal; S3, calculating the interference light intensity to obtain phase information of the Rayleigh optical signal, thereby obtaining information of the signal sensed by the sensing fiber. The method and device use the [phi]-OTDR technology which can be used for the PGC-based phase demodulation technology, reduces the influence of the Rayleigh fiber signal intensity attenuation on the measurement noise without increasing signal processing workload, and eliminates the detection dead zone caused by a high phase noise.

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 ...

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Application Information

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Patent Type & Authority Applications(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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