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June 1, 2006 By: Stephanie vL Henkel, Sensors Sensors

These jumpy times call for ever more building security, and that includes access through revolving doors. The ceiling-mounted BlackHawk system uses active IR and triangulation distance measuring to detect unauthorized entry or exit in a door quadrant. No one can share a space or hang onto the door top and sneak in. (http://tinyurl.com/nuxkh)

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