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基于相干后向瑞利散射原理搭建了一套分布式光纤传感系统,并设计了一种优化的掺铒光纤放大器。以此为基础进行实验,分析了消光比、传感距离和传感光纤前后端反射等几个关键因素对相干后向瑞利散射波形的影响。实验结果表明:适当地设计电光调制器偏置电压与掺铒光纤放大器,可明显改善注入脉冲信号峰值功率和消光比;由于注入信号光消光比的限制,短距离传感比长距离传感更容易获得优良的散射信号;消除传感光纤前后端的菲涅耳反射也能显著提升散射信号的质量与稳定性。
A set of distributed optical fiber sensing system was built based on the principle of coherent and Rayleigh scattering, and an optimized erbium-doped fiber amplifier was designed. Based on this, experiments were carried out to analyze the influence of extinction ratio, sensing distance and front and back reflection of sensing fiber on Rayleigh scattering waveforms. The experimental results show that the proper design of the electro-optic modulator bias voltage and the erbium-doped fiber amplifier can significantly improve the peak power and extinction ratio of the implanted pulse signal. Due to the extinction ratio of the injected signal light, the short-range sensing is more effective than the long-distance sensing Easy to get good scattering signal; eliminate the front and rear sensing fiber Fresnel reflection can significantly improve the quality and stability of the scattering signal.