基于附加环结构的分布式光纤传感系统研究

研究了一种使用2×2耦合器将附加环耦合到萨格奈克主环上的分布式光纤传感预警系统.采用单模光纤和脉冲光源，在时域上提取光不同次经过附加环的干涉光束多重响应.理论推导和仿真试验证明，比较多重响应的幅度能够探测发生在主环里因外界破坏事件引起的振动所在位置.提出了准确定位的数学模型，其定位方法与外界作用的频率特性无关.

Distributed Optic Fiber Sensor with a Sub-ring

A novel distributed optical fiber sensing system was proposed.The monomode fiber and impulse light source were exploited.So the multi-responses of interference beams were extracted when they passed sub-ring different times.It is proved theoretically and experimentally that the position of vibration occurred in the main ring,which is caused by breakage event outside,can be detected by comparing the amplitude of multi-responses.The function of definite locating was indicated.The position detection does not depend on the frequency characteristics.