Research on Anti-Laser-Eavesdropping Devices

Research of anti-laser-eavesdropping devices is very critical to the security of confidential meetings for the nation and enterprises. Based on the depth study of laser eavesdropping principle as well as the human hearing characteristics, an implementation of anti-laser-eavesdropping was proposed. The system is composed of the noise generators and vibration transducers. Voice signals before and after eavesdropping were compared, the results of which show that the anti-laser-eavesdropping devices could produce noise signal which could mask the voice signal and successfully block the laser eavesdropping channels.