OFDR large strain measurement method under high spatial resolution

A technology with high spatial resolution and measurement methods, which is applied in the field of optical fiber sensing and detection, can solve the problems of reduced cross-correlation between reference signals and test signals, and failure to obtain results, so as to remove abnormal values, improve accuracy, and improve The effect of spatial resolution

Active Publication Date: 2021-07-30
SHANDONG UNIV
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Problems solved by technology

However, when the spatial resolution of the measurement is improved or when a large strain is measured, the cross-correlation correlation between the reference signal and the test signal will be greatly reduced, resulting in multiple peaks and false peaks in the cross-correlation results, and incorrect results cannot be obtained

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  • OFDR large strain measurement method under high spatial resolution
  • OFDR large strain measurement method under high spatial resolution
  • OFDR large strain measurement method under high spatial resolution

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Embodiment Construction

[0034] Attached below Figure 1-4 The technology will be further described with specific examples to help understand the content of the present invention.

[0035] A kind of OFDR large strain measurement method under high spatial resolution, its step comprises as follows,

[0036] S1. Two signals are collected respectively, one is a signal not containing strain information, which is a reference signal; the other is a signal containing strain information, which is a test signal.

[0037] S2. Divide the reference signal and the test signal into N equal parts according to a certain window size C in the distance domain.

[0038] S3. Using the first distance domain information of the reference signal and the test signal by fast inverse Fourier transform.

[0039] S4. Perform cross-correlation operation on the reference signal after the inverse Fourier transform and the test signal to obtain a one-dimensional cross-correlation result.

[0040] S5. Repeat steps S3-S4 to obtain the...

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Abstract

The invention provides an OFDR large strain measurement method under high spatial resolution, and the method comprises the steps: converting a conventional one-dimensional cross-correlation processing result signal corresponding to each position on an optical fiber into a two-dimensional image signal in the strain measurement of an OFDR system; on the basis of a two-dimensional image, performing denoising processing on the image through a total variation denoising algorithm or a wavelet denoising algorithm, performing next operation on the processed image, and finally obtaining a large strain measurement result under high spatial resolution. The method has the advantages that the OFDR sensing system based on wavelet denoising algorithm performs denoising on the two-dimensional image information, the spatial resolution of the system can be improved, abnormal values of large strain measurement results can be effectively removed, the measurement accuracy is improved, and large strain measurement under the high spatial resolution is achieved.

Description

technical field [0001] The invention relates to an OFDR large strain measurement method under high spatial resolution, which improves the strain measurement range of the OFDR system under high spatial resolution, and belongs to the technical field of optical fiber sensing and detection. Background technique [0002] In distributed optical fiber sensing, the optical fiber is not only the sensing medium but also the transmission medium for measurement. Using the transmission characteristics of light waves in the optical fiber, real-time monitoring of the external environment along the length of the optical fiber is realized. Distributed optical fiber sensing technology has the advantages of strong anti-electromagnetic interference ability, superior remote signal transmission performance, high test accuracy, repeat stability, high positioning accuracy, and large sensing distance. Based on its above-mentioned advantages, this technology is being gradually applied in more and mor...

Claims

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Application Information

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IPC IPC(8): G01B11/16G01D5/26
CPCG01B11/161G01D5/266G01D5/268
Inventor 刘兆军杨文晨秦增光徐演平丛振华渠帅王泽群李帅
Owner SHANDONG UNIV
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