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Sunday, August 03, 2008

Long distance LASER microphone

Cheap Spy Equipment - A laser microphone is a surveillance device that uses a laser beam to detect sound vibrations in a distant object

For use in situations where secret surveillance is absolutely necessary and the operator is not able to enter the target room in order to place a transmitter.

This system allows the operator to carry out an undetectable surveillance operation from outside the building with a line of sight range of between 25 and 650 meters (dependant on prevailing conditions).

The system consists of three parts: Laser Transmitter | Laser Receiver | Amplifier Unit with Audio-Recorder. This system is operated by transmitting an invisible IR-beam to the window of the target room. The window pane vibrates slightly, due to sound waves emanating from speech. The beam is reflected from the window pane according to the law of optics, ie. the angle of incidence is equal to the angle of reflection. The receiver picks up the reflected beam that is modulated by the window pane vibrations, and the optical signals are automatically converted into electronic signals. The picked up speech is now filtered, amplified and recorded. Both the transmitter and the receiver are built into standard single lens reflex cameras, allowing for perfect concealment. The complete system is supplied in a camera case incorporating amplifier, filters, recorder, 2 tripods (packed separately) power unit, head-phones, search tone and all cables.

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The system monitors and records sound wave vibrations which reflect off smooth-surface glass (single or double glass thermopane). The transmitter laser's angle of incidence equals the angle of reflection to the receiver. Rippled, grained, etched or multi-laminated glass will not provide a suitable reflecting surface from which to record.

Acoustic interference caused by interior and exterior sound wave reflections may be filtered and modulated by the system. The transmission may be fine-tuned by means of a modulated search tone or by adjusting the placement of the receiver. Tape recordings may be further edited at the user's option.


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