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Method of improving distributed fiber sensing resolution in optical frequency domain reflection

A technology of optical frequency domain reflection and distributed optical fiber, applied in the direction of using optical devices, instruments, measuring devices, etc., can solve the problem of low sensitivity of strain sensing, achieve strain or temperature sensing resolution improvement, optical frequency resolution Improved effect

Active Publication Date: 2017-06-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method adopts the ordinary window calculation method, and the strain sensing sensitivity is not high, and the spatial resolution needs to be sacrificed to improve the effect of measurable smaller strain or temperature values.

Method used

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  • Method of improving distributed fiber sensing resolution in optical frequency domain reflection
  • Method of improving distributed fiber sensing resolution in optical frequency domain reflection
  • Method of improving distributed fiber sensing resolution in optical frequency domain reflection

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Embodiment 1

[0046] A method for improving the resolution of distributed optical fiber sensing in optical frequency domain reflection, see figure 1 with figure 2 , the optical fiber sensing resolution method comprises the following steps:

[0047] 101: Use the main interferometer 25 in the optical frequency domain reflection distributed optical fiber strain sensing device to collect two groups of beat frequency interference signals formed by back Rayleigh scattering in the optical fiber 15, one group is the signal without strain applied, and the other group is In order to apply the strain signal, fast Fourier transform is performed on the two sets of beat frequency interference signals respectively, and the optical frequency domain information is converted into the distance domain information corresponding to each position in the optical fiber 15;

[0048] 102: Through a moving window of a certain length, two sets of distance domain information of each position are selected to form a loc...

Embodiment 2

[0071] The following is combined with specific Figure 3a , Figure 3b as well as Figure 4 , Table 1 further introduces the scheme in Embodiment 1, see the following description for details:

[0072] Such as Figure 3a As shown, in the cross-correlation graph without zero padding operation, when the spatial resolution is 1cm and the strain to be measured is 10 microstrain, it can be seen that the cross-correlation peak does not move. The reason is that the number of data points is insufficient, resulting in the cross-correlation graph. The frequency value of the interval between points is relatively large, which cannot describe the small cross-correlation peak frequency shift, resulting in the inability to describe the small strain change value corresponding to the frequency shift.

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Abstract

The invention discloses a method of improving distributed fiber sensing resolution in optical frequency domain reflection. The method of improving distributed fiber sensing resolution in optical frequency domain reflection includes the following steps: in optical frequency domain reflection, a single-mode fiber rayleigh scattered spectrum shift performs distributed strain or temperature measurement, and utilizes zero fill to expand the data segment length of a local distance domain; quick inverse Fourier transform is performed on the expanded local distance domain to obtain the local optical frequency domain data, and zero fill is performed to enable the local optical frequency domain data to obtain frequency spectrum zooming; and after two groups of local optical frequency domain data segments perform cross correlation operation, the light frequency resolution is improved, and then the strain or temperature sensing resolution is improved. The method of improving distributed fiber sensing resolution in optical frequency domain reflection realizes the effect that in the same spatial resolution condition, without sacrificing the spatial resolution, lower strain or temperature value can be measured.

Description

technical field [0001] The invention relates to the technical field of distributed optical fiber sensing instruments, in particular to a method for improving the resolution of distributed optical fiber sensing in optical frequency domain reflection. Background technique [0002] Distributed sensing with high precision and high spatial resolution is widely used in many fields such as people's livelihood, national defense and security, such as structural health monitoring of aircraft, spacecraft, ships, national defense equipment, industrial equipment, bridges and culverts, etc. Spectral shifting of single-mode fiber Rayleigh scattering in optical frequency domain reflectance enables distributed strain sensing with high precision and high spatial resolution. [0003] In this method, ordinary single-mode communication optical fiber is used as the sensing optical fiber, and the spatial resolution is integrated by taking a window for the distance domain signal, and then calculati...

Claims

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Application Information

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IPC IPC(8): G01B11/16G01K11/32
CPCG01B11/161G01K11/32
Inventor 丁振扬杨迪刘铁根刘琨江俊峰赵士元崔继文
Owner TIANJIN UNIV
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