【摘要】 介绍了一种采用模式耦合原理的强度调制型扰动定位传感器,传感光纤为多模光纤。光在传感光路中沿相反的方向传播,分别由两个探测器接收,通过计算扰动信号到达两个探测器的时间差,可以得到扰动的位置。本文分析了其传感原理、定位原理及影响定位精度的因素,通过采用宽谱光源、数字滤波等方法使定位精度提高到约±100 m。所述方案定位精度高、结构简单、传感距离长,适用于长距离管道监测、安全防卫等各种扰动传感领域。更多还原

【Abstract】 An intrusion location sensor,which is adopting the theory of mode coupling,based on multimode fiber intensity modulation is introduced.The actual sensor element is the multimode fiber.Two detectors receive the counter-propagating optical signals in the optical fibers.The position of the intrusion will be located by calculating the time-delay between the counter-propagating optical signals.The sensing theory,the location theory,and the factors affecting the accuracy of location are well researched.The accuracy of ±100m is obtained by adopting wide bandwidth source,digital filter,etc.This scheme can be deployed to various intrusion sensing applications such as pipeline monitor and perimeter security for its accurate location,simple structure and long sensing distance.更多还原