| 一种新的光纤布里渊传感散射谱拟合方法 |
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| 引用本文： | 肖尚辉,李立. 一种新的光纤布里渊传感散射谱拟合方法[J]. 光学技术, 2009, 35(6) |
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| 作者姓名： | 肖尚辉 李立 |
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| 作者单位： | 宜宾学院,物理与电子工程系,四川,宜宾,644000;电子科技大学,通信与信息工程学院,成都,610054;电子科技大学,通信与信息工程学院,成都,610054 |
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| 基金项目： | 国家“863”计划资助项目(2008AA04Z406) |
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| 摘 要： | 讨论了应用于光纤分布式布里渊传感散射谱最优化拟合的Levenberg-Marquardt(L-M)非线性最小二乘算法。分析并推导了一种可较好地反映入纤脉冲宽度越来越窄所引起的光纤分布式布里渊传感散射谱形状变化的Pseu-do-Voigt分析拟合模型。由调制脉冲光和调制器泄漏连续光共同作用所产生的光纤分布式布里渊传感散射谱应为Lorentzian型谱和Gaussian型谱的线性权重组合。Gaussian型函数部分可视为Lorentzian型函数谱的近似修正处理。基于L-M算法对光纤布里渊传感散射谱采样数据进行了曲线拟合和最优化参数估计,所得到的结果与理论分析情况吻合。
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| 关 键 词： | 光纤分布式传感 Levenberg-Marquardt算法 布里渊散射谱 Pseudo-Voigt型曲线 |
New fitting method for Brillouin-based scattering spectrum of fibre-optic distributed sensing systems |
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| XIAO Shang-hui,LI li. New fitting method for Brillouin-based scattering spectrum of fibre-optic distributed sensing systems[J]. Optical Technique, 2009, 35(6) |
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| Authors: | XIAO Shang-hui LI li |
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| Affiliation: | 1.Department of Physics and Electronic Engineering;Yibin University;Yibin 644000;China;2.School of Communication and Information Engineering;University of Electronics Science & Technology;Chengdu 610054;China |
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| Abstract: | A double linewidth Nonlinear Pseudo-Voigt analytical model of the combination between Lorentzian and Gaussian profile of Brillouin-based scattering spectrum is proposed to handle the spectral shape variance caused by the short pulse interaction during the Brillouin scattering process in optical fiber distributed sensing systems.With the Levenberg-Marquardt non-linear least squares algorithm,some measurement data of Brillouin scattering spectrum are fitted,and some spectral parameters are optimally estimated... |
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| Keywords: | Distribute fiber sensors Levenberg-Marquardt algorithm Brillouin spectrum Pseudo-Voigt profile |
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