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Motion detection system

  • US 6,163,025 A
  • Filed: 03/25/1998
  • Issued: 12/19/2000
  • Est. Priority Date: 03/27/1997
  • Status: Expired due to Term
First Claim
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1. A detection system comprising motion detectors, which each define a surveillance area, and which are arranged for responding to the movement of objects in the surveillance areas, which are at least partially separated from each other in space, by delivering respective detector signals, characterized in that said motion detectors are connected in such a manner that movement of the object through successive surveillance areas in one direction will result in the delivery of different first and second signals that together form a quadrature signal that corresponds to the motion of the object as it moves through the successive surveillance areas.

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