Positioning method of linear sagnac distributed optical fiber sensing system

A technology of distributed optical fiber and sensing system, which is applied in the field of positioning, can solve problems such as positioning failure, and achieve the effect of solving positioning failure

Active Publication Date: 2021-01-19
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

[0005] The problem to be solved by the present invention is to provide a positioning method for a linear Sagnac distributed optical fiber sensing system to solve the problem of positioning failure when two position points are disturbed at the same time

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  • Positioning method of linear sagnac distributed optical fiber sensing system
  • Positioning method of linear sagnac distributed optical fiber sensing system
  • Positioning method of linear sagnac distributed optical fiber sensing system

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Embodiment Construction

[0020] The implementation of the present invention will be described in detail below with reference to the drawings and examples, so as to fully understand and implement the implementation process of how to use technical means to solve technical problems and achieve technical effects in the present invention.

[0021] A kind of positioning method of linear Sagnac distributed optical fiber sensing system, described method comprises the following steps,

[0022] (1), firstly use the passive homodyne demodulation method to obtain the phase difference signal from the two signals collected by the dual-channel data acquisition card

[0023] (2) Find the phase difference signal power spectral density;

[0024] (3) Obtain two sets of notch frequencies with different periods from the power spectral density, and calculate the average period Δf of each notch frequency 1 and Δf 2 ;

[0025] (4), if the refractive index of the sensing fiber is n, the speed of light is c, then the po...

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Abstract

The invention discloses a positioning method for a linear Sagnac distributed optical fiber sensing system. The method comprises the following steps: (1), first, demodulate the two-way signals collected by the dual-channel data acquisition card with passive homodyne The method obtains the phase difference signal (2), asks the power spectral density of the phase difference signal; (3), obtains the notch wave frequency of two sets of different cycles by the power spectral density, and calculates the average cycle sum of the respective notch wave frequencies; (4) , Assuming that the refractive index of the sensing fiber is n, and the speed of light is c, the position of the disturbance point 1 and the position of the disturbance point 2 can be obtained by the formula. The invention can solve the problem of positioning failure when two position points are disturbed at the same time.

Description

technical field [0001] The invention relates to the technical field of positioning methods, in particular to a positioning method for a linear Sagnac distributed optical fiber sensing system. Background technique [0002] The linear Sagnac distributed optical fiber sensing system has broad application prospects. It can be used for pipeline leakage and intrusion monitoring, perimeter security monitoring, subway tunnel health monitoring, and ocean acoustic signal monitoring. It is of great significance to protect people's lives and property safety. [0003] In the linear Sagnac distributed optical fiber sensing system, the most commonly used positioning method is based on the notch frequency scheme. In order to realize the localization when multiple location points are disturbed at the same time, methods such as double Fourier transform are proposed. However, these methods all believe that the influence of disturbances at different positions on the notch frequency is isolate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353
CPCG01D5/353
Inventor 万生鹏熊新中
Owner NANCHANG HANGKONG UNIVERSITY
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