Phase-sensitive optical time domain reflection signal adaptive filtering method and device

An adaptive filtering and phase-sensitive light technology, which is applied in the field of optical information sensing, can solve problems affecting computational efficiency and complexity, and achieve the effects of optimizing filtering parameters, small computational load, and high efficiency

Pending Publication Date: 2022-05-27
厦门市洵皓科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are more complicated and affect the computational efficiency

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  • Phase-sensitive optical time domain reflection signal adaptive filtering method and device
  • Phase-sensitive optical time domain reflection signal adaptive filtering method and device
  • Phase-sensitive optical time domain reflection signal adaptive filtering method and device

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Embodiment 1

[0122] This embodiment provides an adaptive filtering method for phase-sensitive optical time-domain reflectometry, which is applied to vibration signal measurement of a phase-sensitive optical time-domain reflectometer, such as Image 6 shown, including:

[0123] Setting the initial value and step size of the filtering parameters of the non-local mean filtering, the filtering parameters include Gaussian parameters, neighborhood window parameters and search window parameters;

[0124] Adjust the Gaussian parameters according to the set step size from the initial value, and calculate the correlation coefficient at the same time. When the correlation coefficient reaches the first peak, record the corresponding Gaussian parameter as the optimal Gaussian parameter;

[0125] The Gaussian parameter is fixed as the optimal Gaussian parameter, and then the neighborhood window parameter is adjusted from the initial value according to the set step size, and the correlation coefficient i...

Embodiment 2

[0144] In this embodiment, a phase-sensitive optical time-domain reflectometry signal adaptive filtering device is provided, which is applied to vibration signal measurement of a phase-sensitive optical time-domain reflectometer, such as Figure 7As shown, including: initialization module, filter parameter optimization module and adaptive filter module;

[0145] The initialization module is used to set the initial value and step size of the filtering parameters of the non-local mean filtering, and the filtering parameters include Gaussian parameters, neighborhood window parameters and search window parameters;

[0146] The filtering parameter optimization module is used to adjust the Gaussian parameter according to the set step size from the initial value, and calculate the correlation coefficient at the same time, and when the correlation coefficient reaches the first peak value, record the corresponding Gaussian parameter as the optimal Gaussian parameter;

[0147] The Gauss...

Embodiment 3

[0166] In this embodiment, a phase-sensitive optical time-domain reflectometry signal adaptive filtering method is provided, which is applied to the vibration signal measurement of a phase-sensitive optical time-domain reflectometer. Whether the value of power density or power density reaches the minimum value as the judgment standard of the optimal parameter can include the following steps:

[0167] Setting the initial value and step size of the filtering parameters of the non-local mean filtering, the filtering parameters include Gaussian parameters, neighborhood window parameters and search window parameters;

[0168] Adjust the Gaussian parameter from the initial value by the set step size, and calculate the correlation coefficient at the same time. After each filtering, record the kurtosis or power density of the correlation coefficient. When the kurtosis or power density of the correlation coefficient reaches the minimum, record the corresponding The Gaussian parameter o...

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Abstract

The invention discloses a phase-sensitive optical time domain reflected signal adaptive filtering method, which evaluates the quality of a non-local mean filtering result through calculation of correlation coefficients, and can be used for optimizing filtering parameters of an image filtering method according to the filtering quality. The parameters are firstly verified by an assumed standard signal and then are applied to actual signal denoising of a phase-sensitive optical time domain reflectometer. The filtering parameters optimized by the related algorithm are compared with the filtering parameters optimized by the traditional peak signal-to-noise ratio and the structure similarity, and the result shows that the optimized filtering parameters are almost the same except that the sizes of neighborhood windows are slightly different. The method is also suitable for filtering other two-dimensional periodic signal images.

Description

technical field [0001] The present invention relates to the technical field of optical information sensing, in particular to a phase-sensitive optical time-domain reflection signal adaptive filtering method and device. Background technique [0002] Due to phase sensitive optical time domain reflectometry It has the advantages of fast response, high sensitivity, and strong multiple detection ability. The research and application of telecommunication has received extensive attention, and it has been applied in the fields of perimeter intrusion monitoring, pipeline protection, and seismic wave mapping. By monitoring the Rayleigh backscatter statistical interference intensity of the incident pulsed light, the phase sensitive optical time domain reflectometry system can provide qualitative vibration measurements. However, coherent noise, white noise and environmental interference will seriously reduce the signal-to-noise ratio of the signal, make the detected signal deteriora...

Claims

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Application Information

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IPC IPC(8): G06V10/30
Inventor 陈文吴敏锋吴启辉陈枭孙琦
Owner 厦门市洵皓科技有限公司
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