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On 25 August 2009, U.S. patent 7,580,533 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 laser-photocell 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 ...
A new type of laser microphone is a device that uses a laser beam and smoke or vapor to detect sound vibrations in free air. On August 25, 2009, U.S. patent 7,580,533 issued for a Particulate Flow Detection Microphone based on a laser-photocell pair with a moving stream of smoke or vapor in the laser beam's path.
A laser microphone can be used to reconstruct audio from a laser beam shot onto an object in a room, or the glass pane of a window. Researchers have also prototyped a method for reconstructing audio from video of thin objects that can pick up sound vibrations, such as a houseplant or bag of potato chips. [18]
Laser microphone; P. Parabolic microphone; R. Radio-frequency sweep; T. The Thing (listening device) This page was last edited on 2 May 2023, at 18:16 (UTC). Text is ...
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In the middle of the cavity was a mushroom-shaped flat-faced tuning post, with its top adjustable to make it possible to set the membrane-post distance; the membrane and the post formed a variable capacitor acting as a condenser microphone and providing amplitude modulation (AM), with parasitic frequency modulation (FM) for the re-radiated ...
Pages in category "Microphones" The following 34 pages are in this category, out of 34 total. ... Laser microphone; Lavalier microphone; M. Magic Mic;
I've read in the past that laser microphones directed at windows can be defeated by attaching speakers or vibrating motors to the glass. Some articles even suggested that net curtains were installed in embassies and government buildings during the Cold War to prevent laser mics being used for spying.