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以BOTDR分布式光纤传感系统为研究对象,分析了不同信噪比条件下洛伦兹曲线拟合单个空间分辨率范围内自发布里渊散射信号的准确性。实验结果表明,当系统平均500次时,拟合残差和方差均比平均5次时小一个数量级,拟合均方根差处于同一个数量级,传感光纤的频率波动小7.36MHz。该结论说明BOTDR系统中布里渊散射信号的信噪较高时,洛伦兹曲线拟合的准确性较好。该研究可为BOTDR系统的算法设计及高准确度特征提取提供参考。
Taking BOTDR distributed optical fiber sensing system as the research object, the accuracy of Lorentz curve fitting with self-issued Brillouin scattering signals in a single spatial resolution range under different signal-to-noise ratio conditions is analyzed. Experimental results show that when the system is averaged 500 times, the fitted residuals and variances are both one order of magnitude smaller than the average of five and the fitted root mean square error is in the same order of magnitude. The frequency fluctuation of the sensing fiber is small 7.36MHz. This conclusion shows that the Lorenz curve fitting accuracy is better when the SNR of Brillouin scattering signals in BOTDR system is higher. The research can provide reference for BOTDR algorithm design and high accuracy feature extraction.