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Distributed temperature strain sensing method based on sub-pulse extraction algorithm

A temperature-strain and sensing method technology, applied in the direction of converting sensor output, using optical devices to transmit sensing components, complex mathematical operations, etc., can solve problems such as strain and temperature cross-sensitivity, achieve temperature and strain, and avoid frequency sweeping The effect of the process

Pending Publication Date: 2021-12-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] Based on the above problems, the present invention provides a distributed temperature strain sensing method based on the sub-pulse extraction algorithm, which solves the problems in the existing distributed optical fiber sensing system based on Brillouin scattering or distributed optical fiber sensing system based on Rayleigh scattering. Technical issues of strain and temperature cross-sensitivity

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  • Distributed temperature strain sensing method based on sub-pulse extraction algorithm
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  • Distributed temperature strain sensing method based on sub-pulse extraction algorithm

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Embodiment 1

[0030] Such as figure 1 As shown, this embodiment provides a distributed temperature and strain sensing system based on optical time domain reflectometer. The measurement system structure includes: laser module 1, coupler 2, modulator module 3, arbitrary waveform generator 4, ring device 5, sensing fiber 6, frequency shifter 7, first coherent detection module 8, second coherent detection module 9, dense wavelength division multiplexer (DWDM) 10.

[0031] Specifically, in Embodiment 1, the continuous laser output from the laser module 1 is connected to the coupler 2 and divided into three parts, one of which is directly connected to the first coherent detection module 8 as the local oscillator of Rayleigh scattering coherent detection, and one After a frequency shift close to the Brillouin frequency shift, one part is connected to the second coherent detection module 9 as a local oscillator; the other part passes through the modulator 3 to generate a detection signal in a large...

Embodiment 2

[0045]This embodiment proposes a distributed temperature strain sensing system based on optical time domain reflectometer, specifically as follows:

[0046] Such as image 3 As shown, a distributed temperature and strain sensing system based on optical time domain analyzer, the measurement system structure includes: laser module 1, coupler 2, modulator module 3, arbitrary waveform generator 4, circulator 5, sensor An optical fiber 6 , a frequency shifter 7 , a first coherent detection module 8 , a second coherent detection module 9 , and a dense wavelength division multiplexer 10 .

[0047] Specifically, in Embodiment 2, the continuous laser output from the laser module 1 is connected to the coupler 2 and is divided into three parts, one of which is directly connected to the coherent detection module 8 as the local oscillator of Rayleigh scattering coherent detection, and one part is connected to the coherent detection module 8 through After a frequency shift close to the Bri...

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Abstract

The invention relates to the field of optical fiber sensing measurement, in particular to a distributed temperature strain sensing method based on a sub-pulse extraction algorithm, which comprises the following steps of firstly, acquiring Rayleigh scattering information and Brillouin scattering information in a large frequency range by using a detection signal in the large frequency range, secondly, acquiring Rayleigh scattering signals and Brillouin scattering signals with different frequencies by using a sub-pulse extraction algorithm, thirdly, forming a complete Rayleigh scattering pattern and a Brillouin gain spectrum, and obtaining a Rayleigh scattering pattern frequency axis and a frequency shift condition of the Brillouin gain spectrum, and finally, according to different response coefficients of the temperature and the strain to the Rayleigh scattering signal and the Brillouin scattering signal, conducting decoupling operation on the temperature and the strain, and acquiring temperature and strain sensing information along the optical fiber. The technical problem of strain and temperature cross sensitivity in an existing distributed optical fiber sensing system based on Brillouin scattering or a distributed optical fiber sensing system based on Rayleigh scattering is solved.

Description

technical field [0001] The invention relates to the field of optical fiber sensing and measurement, in particular to a distributed temperature and strain sensing method based on a sub-pulse extraction algorithm. Background technique [0002] Distributed optical fiber sensing systems have been widely used in geological prospecting, structural health monitoring, temperature measurement and other fields. Distributed optical fiber sensing based on Rayleigh scattering and Brillouin scattering is sensitive to both temperature and strain, resulting in the problem of temperature-strain cross-sensitivity in both types of systems, which limits its application in engineering. [0003] Due to the large difference in the sensing mechanism between the traditional distributed sensing based on Rayleigh scattering and the distributed sensing based on Brillouin, it is difficult to integrate the two systems organically. In addition, distributed sensing based on Brillouin scattering needs to o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353G06F17/12
CPCG01D5/35361G01D5/35364G06F17/12
Inventor 王子南熊吉梁永鑫
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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