OFDR distributed vibration sensing detection method based on compressed sensing

A technology of compressed sensing and vibration sensing, which is applied to measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of increasing hardware costs, high price of distributed optical fiber sensing systems, etc., and achieve operating speed improvement and reduction Storage space and operating speed, the effect of reducing the amount of data

Active Publication Date: 2020-09-01
SHANDONG UNIV
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Problems solved by technology

Although the frequency response range of the system can be increased by increasing the sweep rate of the tunable light source, the hardware cost is greatly increased, which is also a main reason for the high price of the distributed optical fiber sensing system

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  • OFDR distributed vibration sensing detection method based on compressed sensing
  • OFDR distributed vibration sensing detection method based on compressed sensing
  • OFDR distributed vibration sensing detection method based on compressed sensing

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Embodiment Construction

[0050] Attached below Figure 1-4 The technology will be further described with specific examples to help understand the content of the present invention.

[0051]In an OFDR sensing system based on compressed sensing technology, processing and restoring data collected includes the following steps:

[0052] S1. Determine the observation matrix Φ corresponding to the required vibration signal, including the following steps:

[0053] S11. simulate the analog signal of any frequency by Matlab software, set the length of the analog signal to be N, and the length of the analog signal is the same as the length of the vibration signal;

[0054] S12. Perform sub-Nyquist sampling on the analog signal simulated in step S11;

[0055] S13. Known according to step S11, the length of the analog signal is N. After step S12 is completed, the total set of sampling positions of each sampling point is the required observation matrix Φ;

[0056] S2. Determine the observation vector y correspond...

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Abstract

The invention discloses an OFDR distributed vibration sensing detection method based on compressed sensing. The OFDR distributed vibration sensing detection method comprises the following steps: S1, determining an observation matrix phi corresponding to a required vibration signal; S2, determining an observation vector y corresponding to the observation matrix phi; S3, obtaining a sparse matrix psi of the signal by using the discrete Fourier transform matrix; S4, performing signal reconstruction and frequency recovery on the acquired data by using an orthogonal matching pursuit algorithm; S5,transforming the signal from a time domain to a frequency domain through Fourier transform to obtain a signal frequency. The method has the advantages that a large amount of data storage space is saved, the improvement of the operation rate is ensured, and the storage space and the operation rate of signals are greatly reduced.

Description

technical field [0001] The invention relates to an OFDR distributed vibration sensing detection method based on compressed sensing, and belongs to the technical field of optical fiber sensing detection. Background technique [0002] Because the optical fiber has strong anti-electromagnetic interference, good electrical insulation and light transmission characteristics. In recent years, distributed optical fiber sensing systems using optical fibers as sensitive components and signal transmission media have attracted more and more attention in national defense, military, and civilian facilities. Distributed optical fiber sensing technology measures the characteristic information along the direction of the optical fiber by detecting and analyzing the optical effects in the optical fiber. Since the characteristic information of the optical fiber changes with the external temperature, strain, and vibration, the environmental parameters around the optical fiber can be sensed. Di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 秦增光渠帅刘兆军徐演平丛振华李钊冯玉茹王恒
Owner SHANDONG UNIV
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