G - Physics – 08 – B
Patent
G - Physics
08
B
340/101, 340/124
G08B 1/08 (2006.01) G08B 13/183 (2006.01)
Patent
CA 1145006
D-21981 ABSTRACT OF THE DISCLOSURE Sensing apparatus for monitoring the passage of objects, including people, through a doorway. A source of radiant energy is positioned at one side of the doorway and two spaced-apart detectors are positioned at the opposite side to receive beams of radiant energy from the source. A receiver is con- nected to each detector and produces a signal indi- cating whether the beam of radiation from the source is impinging on its associated detector or is being blocked by a passing object. Logic circuitry responds to the signals from the receivers and pro- duces a first or second output condition depending upon which beam from the source is the last one to be interrupted by a passing object. Output circuitry coupled to the logic circuitry produces a pulse at one output terminal on a transition from the first to the second output condition indicating passage of an object through the doorway in one direction and produces a pulse at another output terminal on a transition from the second to the first output con- dition indicating passage of an object through the doorway in the opposite direction.
360115
Geller William L.
Naugle Richard L.
Gte Laboratories Incorporated
R. William Wray & Associates
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