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The Buran eavesdropping system made by Léon Theremin [1] Lavrentiy Beria, had used this Buran device to spy on the U.S., British, and French embassies in Moscow. It has been reported that the National Security Agency (NSA) makes use of laser microphones [2].

The Buran eavesdropping system made by Léon Theremin [1] Lavrentiy Beria, had used this Buran device to spy on the U.S., British, and French embassies in Moscow. It has been reported that the National Security Agency (NSA) makes use of laser microphones [2].

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n this work, an electronic device capable of receiving vibration modulated laser signals was designed, the idea is to convert these vibrations through the device to a hearable sound with high quality. The transmitter is composed ofan infrared laser diode,and the receiver consists of photo-transistor, an integrated circuit of LM358, first order filt...

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... technique of using a light beam to remotely record sound was probably originated by Léon Theremin in the Soviet Union at or before 1947, when he developed and used the Buran eavesdropping system. This is done by using a low power infrared beam (not a laser) from a distance to detect the sound vibrations in the glass windows as shown in fig. (1) [1]. In 2009, U.S. patent was issued for a device that uses a laser beam and smoke or vapor to detect sound vibrations in free air ("Particulate Flow Detection microphone based on a laserphotocell pair with a moving stream of smoke or vapor in the laser beam's path"). Sound pressure waves cause disturbances in the smoke that in turn causes ...