Fast Sensing of Temperature and Strain along Optical Fiber based on Brillouin Scattering

GUAN Guo-fei; SONG Qing-wu; CHEN Zhi-ming; ZHONG Wei-feng; LI Jun

doi:10.13756/j.gtxyj.2022.01.009

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Fast Sensing of Temperature and Strain along Optical Fiber based on Brillouin Scattering

更新时间：2022-06-15

- Fast Sensing of Temperature and Strain along Optical Fiber based on Brillouin Scattering
- Study on Optical Communications Issue 1, Pages: 45-51(2022)
- 作者机构：
  
  江苏方天电力技术有限公司，南京　211103
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2022.01.009
  CLC： TN247
- Published：10 February 2022，
  
  Received：09 February 2021，
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GUAN Guo-fei, SONG Qing-wu, CHEN Zhi-ming, et al. Fast Sensing of Temperature and Strain along Optical Fiber based on Brillouin Scattering. [J]. Study on Optical Communications (1):45-51(2022)
DOI：

GUAN Guo-fei, SONG Qing-wu, CHEN Zhi-ming, et al. Fast Sensing of Temperature and Strain along Optical Fiber based on Brillouin Scattering. [J]. Study on Optical Communications (1):45-51(2022) DOI： 10.13756/j.gtxyj.2022.01.009.

摘要

为了提高基于抛物线拟合的布里渊频移提取准确性，文章采用Savitzky-Golay滤波对含噪布里渊谱进行滤波得到比较准确的布里渊频移后，从未滤波布里渊谱中选择对称的部分，然后采用抛物线拟合提取布里渊频移。由于文章所提方法能得到对称程度较高的布里渊谱，且计算耗时增加不多，因此改进的抛物线拟合方法可以在保证实时性的基础上显著提高布里渊频移提取的准确性。文章采用了原始抛物线拟合方法、基于伪Voigt模型的拟合方法和改进的抛物线拟合方法来计算光纤沿线的布里渊频移，结果表明，改进的抛物线拟合方法计算时间要长于原始抛物线拟合方法，但仅为基于伪Voigt模型拟合方法的1/37～1/28，且布里渊频移计算准确性与后者相似。基于文章所提算法有望实现光纤沿线温度和应变的快速感知。

Abstract

To improve the extraction accuracy

the Savitzky-Golay filter is used to filter the noisy Brillouin spectra. Based on the obtained relatively accurate Brillouin frequency shift

the symmetric part of the Brillouin spectrum is selected according to the raw Brillouin spectrum. Based on the selected spectrum

the Brillouin frequency shift is extracted by the parabolic fitting. Since the proposed method can obtain the Brillouin spectrum with a high degree of symmetry and more calculation time

the improved parabolic fitting method can significantly improve the accuracy of the extracted Brillouin frequency shift in real-time demonstration. This paper considers the original parabolic fitting method

the fitting method based on the pseudo-Voigt model and the improved parabolic fitting method to calculate the Brillouin frequency shift along the optical fiber. The results show that the calculation time of the modified parabola fitting method is longer than that of the original parabola fitting method

but only 1/37~1/28 of that of the fitting method based on the pseudo-Voigt model. The accuracy of the Brillouin frequency shift extracted by the former is similar to that of the latter. The proposed method is effective to realize fast sensing of temperature and strain along the optical fiber.

关键词

分布式光纤传感布里渊散射温度和应变Savitzky-Golay滤波快速

Keywords

distributed optical fiber sensingBrillouin scatteringtemperature and strainSavitzky-Golay filterfast

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