中文摘要：

运用虚拟仪器技术及图形化编程软件Lab VIEW,对激光监听装置的输出信息进行采集和处理,以实现长距离的激光监听探测。激光监听装置采用迈克尔逊干涉光路的原理设计,激光器发射激光并由分光器分为待测光与参考光两路相干光束,待测光经过声音信号调制后,与参考光在光电传感器接收面上实现干涉混频,利用Lab VIEW控件对采集的信号进行数据分析、声音还原、声音文件播放和保存等处理。这种方法与传统基于文本编程的语音内容解析方法相比,具有开发过程简单,成本低,人机交互界面友好等优点。实验结果表明,设计的基于虚拟仪器技术的激光监听系统可以探测15-20 m外房间窗户的声音信息,效果良好。

英文摘要：

A laser eavesdropping system is designed by using LabVIEW in this paper. The system is based on principle of Michelson interference,acquires and processes the output signal of a laser eavesdropping system,and restores the voice for further analysis. The laser device,as part of the whole system,emits laser which is divided into two coherent beams via an optical splitter, reaching the receiving surface of a photo sensor for self-mixing interferometry measurement. The output data will be further processed for voice reconstruction. The development of this system takes the advantage of visual programming and rapid application development abilities provided by LabVIEW to realize the system prototype quickly,and to adjust the parameters easily so that best possible voice reconstruction quality can be reached under different environments. The experiments show that the laser eavesdropping system based on LabVIEW can detect the voice information from the window of the room in 15-20 meters away and get a good effect.