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Concept
Optical turnstile
Résumé
An optical turnstile is a physical security device designed to restrict or control access to a building or secure area. Optical turnstiles 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. The advent of the Americans with Disabilities Act (ADA) drove optical turnstile development because physical barriers for access were no longer legal for public access due to the fact that persons in wheelchairs or with other disabilities could not use them as access points. For this reason, they are not likely to be used in subways and stadiums, as they are suited for settings where design and aesthetics are deemed important, such as lobbies. They are perfect for high rise buildings with a single path through the lobby and staffed reception. The rate of people passing through the optical turnstile is high, with less delay than other methods. They are also suitable for the handicapped, as they are barrier-free.
Early optical turnstiles used centralized programmable logic controllers i.e. a single processor for each installation location. Later individual controllers, one per lane, were employed.
Some of the first North American optical turnstiles were developed in the late 1980s for the San Francisco market by Omega Corporate Security of Walnut Creek, California. Early installations included Charles Schwab, East Bay Municipal Utility District, and Wells Fargo. In parallel, Automatic Systems and others developed barrier type optical turnstiles (speedgates) for the mass transit industry that were eventually adapted and evolved for Class A commercial real estate and corporate HQ entrance control markets.
Source officielle
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