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Measurement method for improving distributed spatial resolution of OFDR system

A technology of spatial resolution and measurement method, which is applied to measurement devices, instruments, optical devices, etc., can solve the problems of reduced and unavailable cross-correlation between reference signals and test signals, so as to remove outliers and improve space. Resolution, the effect of improving accuracy

Active Publication Date: 2021-08-10
SHANDONG UNIV
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Problems solved by technology

However, when the measurement spatial resolution is improved, 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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  • Measurement method for improving distributed spatial resolution of OFDR system
  • Measurement method for improving distributed spatial resolution of OFDR system
  • Measurement method for improving distributed spatial resolution of OFDR system

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Embodiment Construction

[0023] Attached below Figure 1-4 The technology will be further described with specific examples to help understand the content of the present invention.

[0024] A measurement method for improving the distributed spatial resolution of an OFDR system, comprising the following steps,

[0025] 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.

[0026] S2. Divide the reference signal and the test signal into N equal parts according to a certain window size C in the distance domain;

[0027] S3. Using fast inverse Fourier transform for each piece of distance domain information of the reference signal and the test signal;

[0028] S4. Performing a cross-correlation operation on the reference signal after the inverse Fourier transform and the test signal to obtain a one-dimensional cross-correlation result;

[0029] S5. Steps S3-S...

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Abstract

The invention discloses a measurement method for improving distributed spatial resolution of an OFDR (Optical Frequency Domain Reflectometer) system. The method comprises the following steps of firstly, converting a traditional one-dimensional cross-correlation processing result signal into a two-dimensional image signal, denoising an image through a Gaussian filtering denoising algorithm on the basis of the two-dimensional image, and then carrying out next operation on the processed image to obtain a two-dimensional image; and finally, a high-spatial-resolution result being obtained. According to the OFDR sensing system based on the Gaussian filtering and denoising algorithm, the spatial resolution of a measurement system can be improved, so the OFDR sensing system has greater advantages and wider application in the high-precision monitoring fields such as space flight and aviation, machinery equipment and the like.

Description

technical field [0001] The invention relates to a measurement method for improving the distributed spatial resolution of an OFDR system, which is applied in the field of strain measurement, improves the spatial resolution of the system, 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, including Raman scattering, Rayleigh scattering and Brillouin scattering, the external environment along the length of the optical fiber is realized. real time monitoring. Distributed optical fiber sensing technology has the advantages of strong anti-electromagnetic interference ability, relatively simple structure, high spatial resolution, and long sensing distance. Based on its above-mentioned advantages, this technology is bei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
CPCG01B11/18
Inventor 刘兆军李帅秦增光徐演平丛振华渠帅杨文晨王泽群
Owner SHANDONG UNIV
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