The PKI 3100 Laser Monitoring System was developed for covert observations in order to extend the surveillance to rooms which can not be entered. As soon as there is a line of sight to the room to be monitored (max. 300m), the PKI 3100 Laser Monitoring System can be used. Acoustic sound waves, as for example human speech, cause minute vibrations of the window panes of a room. The absolutely invisible laser beam is sent onto the window of the room to be monitored and is modulated by the vibrations there. This modulated laser light is picked up by a special receiver and demodulated (speech is recovered) again. This signal can now be listened to or also recorded. The set-up of such an optical system can be quickly realised thanks to a pilot tone function and graphic evaluation via the delivered notebook. The high-quality tripods with gear heads provide for a solid stand of the equipment. The system consists of 2 units.

General Facts:

• Transmits an invisiible laser beam to the window of the target room
• Window pane is slightly vibrating in accordance to the sound waves emanating from speech
• Receiver picks up the reflected beam that is modulated by the window pane vibrations
• Consists of a laser emitter and laser receiver
• Adjustment of the laser by using an optical sight on the ransmitter
• For searching and adjusting of the reflected beam an infrared sensitive camera is used on the receiver
• Sound waves from acoustic signals cause lowest vibrations on a window pane
• Invisible laser beam is transmitted to the window pane of the observed room and will be reflected
• Reflected beam is slightly changed in its angle, caused by the vibration of the window pane
• Reflected laser beam will be detected by the receiver and it detects the position changing of it