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Two-section type optical fiber sensing underwater acoustic signal compensation method and device

A technology of optical fiber sensing and underwater acoustic signals, applied in measuring devices, measuring ultrasonic/sonic/infrasonic waves, advanced technology, etc., to achieve the effect of reducing losses and improving quality

Active Publication Date: 2022-07-15
ZHEJIANG LAB
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  • Application Information

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Problems solved by technology

At present, in the application of optical fiber distributed acoustic wave sensing data, there is no public information compensation scheme for reducing signal processing loss and weight loss compensation. Therefore, this two-stage optical fiber distributed acoustic wave sensing signal compensation method research is important

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  • Two-section type optical fiber sensing underwater acoustic signal compensation method and device
  • Two-section type optical fiber sensing underwater acoustic signal compensation method and device
  • Two-section type optical fiber sensing underwater acoustic signal compensation method and device

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Embodiment

[0088] For the low signal-to-noise ratio optical fiber hydroacoustic signal, a two-stage optical fiber sensing underwater acoustic signal compensation method is used, and the flow chart of the first stage signal compensation is as follows figure 1 As shown, the flow chart of the second stage signal compensation is as follows figure 2 shown.

[0089] 1. The experimental data obtained by S1 is to demodulate the phase value of the scattered signal through the phase generation carrier method. The signal sampling frequency is 20kHz, and the sensing signal containing the two dimensions of time and phase is obtained, such as image 3 shown;

[0090] 2. Set the decomposition number K of the variational modal decomposition model to 6, the penalty factor α to a random number in the range of 0~5000, and the iteration threshold T to a random number in the range of 1e-7~1e-2. The number is set to 400, the number of iterations is set to 400, the population is selected by the method of ro...

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Abstract

The invention discloses a two-section type optical fiber sensing underwater acoustic signal compensation method and device. According to the underwater acoustic signal compensation method, in the sensing signal frequency domain decomposition processing process, an optimal penalty factor and an iteration threshold parameter of sensing signal variational mode decomposition are searched through a genetic algorithm, so that signal loss is reduced as much as possible in the signal processing process; and secondly, the lost signal is compensated back to each modal component through a compensation algorithm based on the multi-scale permutation entropy, so that useful information of the underwater acoustic sensing signal is lost as little as possible in the frequency domain decomposition processing process, and the signal-to-noise ratio of the sensing signal is improved.

Description

technical field [0001] The invention relates to the field of optical fiber sensing underwater acoustic signal processing, in particular to a two-stage optical fiber sensing underwater acoustic signal compensation method and device. Background technique [0002] Fiber-optic distributed acoustic sensing (DAS) technology based on the principle of phase-sensitive optical time domain reflectometry (φ-OTDR) is of great significance in ocean exploration because of its large detection range and strong anti-interference ability. Due to the wide frequency range, low signal-to-noise ratio, and little prior information of distributed optical fiber sensing signals, in the detection and identification application of optical fiber sensing signals, the sensing signals are usually converted from the time domain to the frequency domain for analysis. Domain information has high robustness and is not susceptible to external interference, which is of great significance for optical fiber sensing ...

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Application Information

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IPC IPC(8): G01H9/00G06N3/12
CPCG01H9/004G06N3/126Y02D30/70
Inventor 彭威刘泽超王皓马玲梅饶云江
Owner ZHEJIANG LAB