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Phi-OTDR signal measurement and noise suppression method based on multi-domain compressive sensing

A compressive sensing and signal measurement technology, applied in measurement devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., to achieve the effect of compressing the total amount of data, increasing the sensing distance, and reducing complexity

Active Publication Date: 2022-04-22
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high sampling rate that needs to satisfy the Nyquist law, the distributed fiber optic vibration sensing system still has the problem of data expansion in the dimensions of space domain and frequency domain.

Method used

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  • Phi-OTDR signal measurement and noise suppression method based on multi-domain compressive sensing
  • Phi-OTDR signal measurement and noise suppression method based on multi-domain compressive sensing
  • Phi-OTDR signal measurement and noise suppression method based on multi-domain compressive sensing

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Embodiment 1

[0046] Figure 1 Is an embodiment of the present invention based on multi-domain compression sensing phi-OTDR signal measurement and noise suppression method flow schematic diagram. The present embodiment may be suitable for measuring distributed optical fiber sensing signals through servers and other equipment, mainly for distributed optical fiber vibration sensing systems represented by φ-OTDR are prone to data expansion problems in the spatial domain and frequency domain. The method may be performed by a distributed optical fiber sensing signal measurement and noise suppression device based on multi-domain compression sensing, the device may be implemented in a software and / or hardware manner, and may be integrated in an electronic device, such as an integrated server device.

[0047] See Figure 1 , this measurement and noise suppression method includes:

[0048] S1, the generation of several different frequencies of detection pulse light at the entire measurement moment, t...

Embodiment 2

[0080] Embodiments of the present invention proposes a phi-OTDR signal measurement and noise suppression device based on multi-domain compression sensing, the apparatus comprising a detection pulse light generation module, a matrix building block, a spatial domain compression perception module, a frequency domain compression perception module and a signal reduction module.

[0081] The Probe Pulsed Light Generation Module is used to generate multiple different frequencies of probe pulsed light.

[0082] Matrix building block for receiving multiple detection pulses of light using data acquisition cards, using the principle of compression perception to randomly subsample the detection pulsed light of different frequencies in multiple domains, and constructing a two-dimensional observation matrix that satisfies the equidistant constraints.

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Abstract

The invention discloses a phi-OTDR signal measurement and noise suppression method based on multi-domain compressed sensing, comprising: using a data acquisition card to receive multiple detection pulse lights, and utilizing the principle of compressed sensing to detect different frequency detection pulses in multiple domains Light is randomly sub-sampled to construct a two-dimensional observation matrix that satisfies the equidistant constraint conditions; the two-dimensional observation matrix is ​​compressed in the spatial domain, and by optimizing and tracking the local intensity peak of Rayleigh scattering in space, the selected Appropriate sub-sampling points; perform compressed sensing on the two-dimensional observation matrix in the frequency domain, and estimate the target frequency point according to the cycle extension characteristics of the sampling; reconstruct the signal of the compressed sensing, using the orthogonal matching pursuit algorithm and Enumeration inversion method to restore the target signal. The invention can significantly compress the total amount of data, reconstruct the target signal, realize high efficiency and low noise in the sensing process, and reduce the hardware cost and software overhead of the sensing system.

Description

Technical field [0001] The present invention relates to the field of distributed sensing optical fiber measurement technology, in particular to a phi-OTDR signal measurement and noise suppression method and apparatus based on multi-domain compression sensing. Background [0002] Phase-sensitive optical time domain reflectometer (φ-OTDR) is a kind of distributed fiber optic sensor, which is characterized by the use of high sensitivity of phase to external disturbances, detect and locate vibration events on the fiber to be measured, and identify whether there is abnormal vibration in cables and pipelines in real time according to the intensity and frequency of vibration events. [0003] in order to The distributed optical fiber vibration sensing system represented by it has the characteristics of long sensing distance, wide frequency measurement range, and dense equivalent sensing nodes, resulting in significant data expansion in multiple dimensions such as spatial domain and fre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 张益昕姚媛媛张旭苹邹宁睦王顺张驰王峰
Owner NANJING UNIV
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