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Optical fiber distributed sensing detection method and device

A technology of optical fiber distribution and detection method, which is applied in the direction of measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve problems such as noise fluctuations, achieve suppression of detection noise fluctuations, improve detection sensitivity, and eliminate detection blind spots Effect

Active Publication Date: 2020-10-30
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

E(z 0 ) and E(z 0 +L) The position dependence of the relative polarization state makes The detected phase noise varies with the fiber position, resulting in noise fluctuations for Φ-OTDR-based distributed vibration and sound detection

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  • Optical fiber distributed sensing detection method and device
  • Optical fiber distributed sensing detection method and device
  • Optical fiber distributed sensing detection method and device

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Embodiment Construction

[0034] 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.

[0035] Such as figure 1 As shown, the optical fiber distributed sensing detection method of the present embodiment includes: S1. Injecting dual light pulses with orthogonal polarization and the same polarization state into the sensing fiber respectively to obtain the Rayleigh light of the sensing fiber and the corresponding Rayleigh light The interference light intensity of the four polarization channels; S2. Complexize the interference light intensity of the polarization channel to generate the sensing channel response matrix, and calculate the polarization-independent complex number according to the unitary matrix characteristic of the response matrix; S3. Calculate from the complex number The phase information of the Rayleigh light is extracted to obtain the ...

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Abstract

The invention discloses an optical fiber distributed sensing detection method and device. The method comprises the steps that S1. double optical pulses having orthogonal polarization and same polarization state are injected into a sensing optical fiber so that Rayleigh scattering light of the sensing optical fiber and interference light intensity of four paths of polarization channels corresponding to the Rayleigh scattering light are acquired; S2. the interference light intensity of the polarization channels is pluralized so that a sensing channel response matrix is generated, and a polarization-independent complex number is calculated according to the unitary matrix characteristic of the response matrix; and S3. the phase information of the Rayleigh scattering light is calculated and extracted from the complex number so that the information of the signal sensed by the sensing optical fiber is acquired. The optical fiber distributed sensing detection method and device have the advantages that the noise detection level can be optimized, the detection sensitivity can be enhanced and the blind detection area caused by high phase noise can be eliminated.

Description

technical field [0001] The invention relates to the technical field of optical fiber distributed sensing, in particular to a detection method and device for optical fiber distributed sensing. Background technique [0002] Phase-sensitive optical time domain reflectometer technology (Φ-OTDR) is a widely used optical fiber distributed vibration and sound detection technology, which has great potential in the fields of perimeter security, seismic wave detection, oil and gas exploration, and safety monitoring of large structures such as pipelines and railways. Significant application value has gradually become a research hotspot at home and abroad. Φ-OTDR technology achieves distributed vibration or acoustic sensing by acquiring the phase information of the backward Rayleigh scattered light (referred to as Rayleigh light) generated by pulsed light everywhere in the sensing fiber. When external vibration or sound acts on a certain position of the optical fiber, it will cause the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 路阳张学亮孟洲余志杰姚琼陈伟彭承彦黄良金楼康曹春燕熊水东
Owner NAT UNIV OF DEFENSE TECH
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