摘要
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。
for the BODTR sensing system,the frequency domain signal of spontaneous Brillouin scattering in every spatial resolution is fitted as Lorentzian curve.The fitting accuracy is studied in detail.In the experiment,when the sensing system is made 500 averaging,the fitting residue and fitting variance is about 1 / 10 to the case for 5 averaging,and the standard deviation is at the same order. Along the 1Km sensing optical fiber,the frequency fluctuation for the 500 averaging is 7. 36 MHz less than that for the 5 averaging.The results shows that the Lorentzian fitting accuracy is better for the higher signal-to-noise ratio of spontaneous Brillouin scattering.The results could be as the technology reference for the BOTDR algorithm design and high-accurate feature extraction.
出处
《激光杂志》
北大核心
2016年第5期15-17,共3页
Laser Journal
基金
国家自然科学基金(31201377)
河南省高等学校重点研究项目(16A416004)
郑州轻工业学院博士启动资金(2013BSJJ012
2014BSJJ086)
关键词
拟合准确度
洛伦兹
布里渊散射
BOTDR
fitting accuracy
Lorentzian curve
Brillouin scattering
BOTDR sensing system
