A Distributed Fiber Strain Demodulation Method Based on Subset Window Adaptive Algorithm

A technology of distributed optical fiber and self-adaptive algorithm, applied in the direction of using optical devices, instruments, measuring devices, etc., can solve the problems of lack of science and evidence, damage to strain measurement accuracy, etc., to reduce experience requirements, improve popularity, The effect of improving accuracy

Active Publication Date: 2019-10-29
DALIAN UNIV OF TECH
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Problems solved by technology

However, this rough estimation method lacks science and basis, which may damage the accuracy of strain measurement.

Method used

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  • A Distributed Fiber Strain Demodulation Method Based on Subset Window Adaptive Algorithm
  • A Distributed Fiber Strain Demodulation Method Based on Subset Window Adaptive Algorithm
  • A Distributed Fiber Strain Demodulation Method Based on Subset Window Adaptive Algorithm

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Embodiment

[0036] The first step, using figure 1 The optical frequency domain reflectometer (OFDR) shown in Fig. for 450000.

[0037] The second step is to calculate the optimal subset window of each subset of the reference Rayleigh scattering spectrum

[0038] 1. According to the required strain calculation accuracy σ(d)=0.008, calculate the noise variance σ(η)=4 of the reference Rayleigh scattering spectrum signal, through the formula Calculate Q t =6.25×10 4 , and set as the threshold;

[0039] 2. According to the formula q t =Q t / K, set the number of subsets K=1500, and calculate the threshold q of the average signal intensity gradient sum of the subsets t = 41.7;

[0040] 3. Set a unified initial window length for each subset Carry out Fourier transform (FFT) to the Rayleigh scattering spectrum signal, the data is converted from the spectral domain to the distance domain, and is truncated into K=1500 subsets with the subset window;

[0041] 4. Perform inverse Fourier ...

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Abstract

The invention discloses a distributed optical fiber strain demodulation method based on a subset window adaptive algorithm. The method builds a theoretical strain computing accuracy model and providesa parameter for effectively assessing the quality of a Rayleigh scattering spectrum; an adaptive subset window algorithm is added into the strain demodulation method; the algorithm can scientificallycompute the length of a subset window, and automatically adjust the length without manual intervention through assessing the quality of the Rayleigh scattering spectrum. The distributed optical fiberstrain demodulation method based on the subset window adaptive algorithm not only can reduce the requirement on user experience, but also can improve strain measurement accuracy, and thus the universality of applications in an engineering field is improved.

Description

technical field [0001] The invention relates to the field of structural health monitoring, in particular to a distributed optical fiber strain demodulation method based on a subset window adaptive algorithm. Background technique [0002] Optical Frequency Domain Reflectometry (OFDR) is an emerging development direction in distributed optical fiber measurement and sensing technology. Compared with the traditional Optical Time Domain Reflectometry (OTDR), OFDR has the characteristics of high signal-to-noise ratio, high spatial resolution, and high sensitivity. The distributed strain measurement based on Rayleigh scattering mainly calculates the offset of Rayleigh scattering spectrum before and after the strain occurs in the optical fiber under test through cross-correlation analysis, so as to obtain the corresponding strain information. [0003] In the actual measurement process, the accuracy of strain measurement is affected by many factors, such as the size of the signal-to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 武湛君锁刘佳赵士元马书义
Owner DALIAN UNIV OF TECH
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