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A Coherent Fading Suppression Method Based on Optimal Position Tracking

A technology of optimal position and reference position, which is applied to measurement devices and uses optical devices to transmit sensor components, instruments, etc., which can solve problems such as unreliability, reduce false alarm rates, and achieve high-fidelity reconstruction.

Active Publication Date: 2022-01-14
NANJING UNIV
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  • Claims
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Problems solved by technology

The above method based on the magnitude of the amplitude is based on the premise that the noise intensity of each intermediate frequency component and each group of reference areas is the same, which is unreliable to a certain extent

Method used

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  • A Coherent Fading Suppression Method Based on Optimal Position Tracking
  • A Coherent Fading Suppression Method Based on Optimal Position Tracking
  • A Coherent Fading Suppression Method Based on Optimal Position Tracking

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Embodiment 1

[0026] refer to figure 1 , this embodiment provides a coherent fading suppression method based on optimal position tracking, which specifically includes the following steps:

[0027] Step S1: The back Rayleigh scattered light generated by the detection pulse light and the reference light are mixed and coherent to output a beat frequency signal. The output beat frequency signal needs to be filtered at an intermediate frequency, and the intermediate frequency component is extracted from it. In this embodiment, the frequency of the beat frequency signal is selected to be 150 MHz. Specifically, with 150 MHz as the passband center, the beat frequency signal is subjected to intermediate frequency filtering, and the intermediate frequency component Δω is extracted therefrom.

[0028] Step S2: Perform IQ demodulation on the intermediate frequency component Δω extracted in step S1, and obtain the phase Φ of the intermediate frequency component Δω. The phase Φ is composed of a matrix c...

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Abstract

The invention discloses a coherent fading suppression method based on optimal position tracking. The steps are as follows: S1: Perform intermediate frequency filtering on the beat frequency signal output after the back Rayleigh scattered light generated by the detection pulse light is coherently mixed with the reference light, and Extract the intermediate frequency component; S2: IQ demodulate the intermediate frequency component to obtain the phase of the intermediate frequency component; S3: select k groups of reference areas that are in a stable state before and after the vibration action area, and compare the phase of the intermediate frequency component between the two reference areas of each group Reconstruct at a reference position; S4: Calculate the signal-to-noise ratio of the intermediate frequency component in the two reference positions of each set of reference areas, and select the minimum signal-to-noise ratio; S5: Select the maximum signal-to-noise ratio at any time , and the reconstructed signal corresponding to the maximum SNR is taken as the final reconstructed signal. The present invention realizes high-fidelity reconstruction of external vibration signals and significantly reduces the false alarm rate under the premise of only using common single-mode sensing optical fiber and not changing the structure of the traditional Φ-OTDR system.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a coherent fading suppression method based on optimal position tracking. Background technique [0002] Phase-sensitive optical time domain reflectometer (Φ-OTDR) has the characteristics of distributed sensing, fast response and high sensitivity, and has shown great application potential in the fields of structural health monitoring, perimeter intrusion monitoring, and earthquake monitoring. Φ-OTDR usually selects two sections of optical fiber that are in a stable state before and after the vibration area as the reference area, and realizes quantitative measurement of external vibration by extracting the phase difference of Rayleigh scattered light (RBS) in the two reference areas over time. . Due to the extremely long coherence length of the narrow-linewidth light source used by Φ-OTDR, the RBS generated by the detection pulse light interferes within the pulse, res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00G01D5/353
CPCG01H9/004G01D5/35361
Inventor 张益昕董嘉赟张旭苹周桐王顺陈可楠张弛王峰
Owner NANJING UNIV
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