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采用基于朗道比的微波外差检测技术的布里渊光时域反射传感系统,获得布里渊散射信号的频移和强度,可以精确地测量沿光纤长度的分布式温度和应变信息。此方法在同一条光纤线路上分别测量光纤的布里渊散射和瑞利散射,且使用布里渊频谱扫描对信号进行处理。给出了这种传感方案的实验系统,并在理论推导的基础上对其性能进行了分析,该传感系统可以获得1℃的温度分辨率和100με的应变分辨率。
The Brillouin optical time-domain reflectometry system based on Landau ratio-based microwave heterodyne detection technology obtains the frequency shift and intensity of the Brillouin scattering signal and accurately measures the distributed temperature and strain information along the fiber length. This method measures the Brillouin scattering and the Rayleigh scattering of the optical fiber on the same optical fiber line respectively and processes the signal by using Brillouin spectrum scanning. The experimental system of this sensing scheme is given, and its performance is analyzed based on the theoretical derivation. The sensing system can obtain the temperature resolution of 1 ℃ and the strain resolution of 100με.