Optical turnstile
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An optical turnstile is a physical security device designed to restrict or control access to a building or secure area. Optical turnstile are usually a part of an access control system, which also consists of software, card readers, and controllers. Optical turnstiles operate much like regular mechanical turnstiles, except that they rely primarily on electronic (infrared) beams, and audible/visual interfaces to control entry. Rather than physically restraining a person, the optical turnstile uses sounds and lights to alert others to attempted entry by unauthorized individuals. For this reason the products are not likely to be used in subways and stadiums, so much as they are suited for settings where design and aesthetics are important, such as lobbies.
