基于四象限探测器的激光监听系统

Laser Eavesdropping System Based on Four Quadrant Detector

为了减弱外界环境对激光监听技术的影响,该文首先分析对激光监听系统产生影响的主要因素。从系统接收端入手,采用四象限(4QD)光电探测器对声波震动产生的偏折角度出发推导大气环境下光轴检测系统中固有分辨精度与细分精度间的关系;然后通过分析4QD检测系统在大气环境下受到外界的约束条件,阐明了激光监听系统中采用4QD探测器作为系统的接收端具有更好的优越性。最后通过一个设计实例与监听试验验证了上述观点。

In order to weaken the impact of external environment on the laser monitor technology, this paper ana- lyzed the main factors which would impact the laser monitoring system. Starting from the receiver system,4QD pho- to detector was adopted, the relations between natural resolution and division precision was deduced from deflection angle produced by acoustic wave vibrations then by analyzing external constraints of 4QD detection system under at- mospheric conditions the super advantages of the four quadrant detection system subjected to outside constraints in atmospheric environments was described. The above opinions were finally proven by designed example and test.