光纤周界探测技术原理及研究现状

Developments in and applications of fiber perimeter detection sensors

户外周界入侵探测器是用于户外大面积边界监测的探测器,近年来它受到广泛的注意和市场的重视。目前市场上的这类产品主要基于电缆或微波技术,而随着分布式光纤传感技术的发展,已有多种类型的光纤传感器应用于周界探测。这些光纤探测器有基于光时域反射(OTDR)技术的,有基于干涉仪技术的,还有很多新兴的技术。光纤周界探测器在发展历史上有两个阶段,第一个阶段的探测器只能判断事件的发生与否和类型,第二个阶段的探测器不仅能判断事件类型,还能对事件进行定位。这里对两种类型的光纤周界探测器分别加以介绍,对各种可行性方案的原理及优缺点进行了论述。

For many years optical fiber was the answer ltmldng for the question. Now, after years of optical - fiber product and digital - signal process（DSP） techniques＇continued devdopment, a range of fiber optic sensors are used in perimeter intrusion detection. The optical fiber sensors in intrusion detection are based on many different principles, such as Optical Time - domain Reflectometry（OTDR） technique, interferometer technique. There are two stages in fiber perimeter detection sensors＇ development. The sensors of first stage can just judge the styles of intrusion. However, the seensors of second stage can also tell the position of intrusion. For each fiber perimeter detection sensors, they have different characteristics and their realization difficulties are variable. This paper introduces and analyzes the fiber sensor technology which could apply on perimeter detection now. ＂lhe advantage and disadvantage of each scheme are also discussed. And many products based on the discussed principle, which are available on market, are also mentioned.