以普通单模光纤作为振动传感媒介, 利用振动在单模光纤中引起的弹光效应对光纤周围环境中的振动信号进行监控。通过Sagnac干涉的方式, 将由弹光效应引起的光信号相位变化解调成为光强变化, 再进行光电转换。对光电转换解调出来的信号通过归一化处理、预加重处理等一系列的算法方式作进一步分析处理, 提取出不同振动事件的振动特征数据, 以实现对单次冲击信号和连续振动信号的区分。以此实现对铁路沿线落石防护网上巨石滚落状况的监控。

By using ordinary single-mode fiber as the medium of vibration sensor, the vibration of photosynthetic efficiency in the single mode fiber is used to monitor the surrounding environment. Sagnac interference is caused by the elastic-optic effect from the change in the phase demodulation of the optical signal to the change of intensity for photoelectric conversion. We normalize the signal after photoelectric conversion and conduct pre-emphasis processing for further analysis and processing. A series of algorithm are used to extract the vibration features of different vibration data, in order to realize sequential single impact signal and vibration signal. By using the proposed method, rock-falling protection along the railway can be realized.