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Apparatus for detecting the number of passers

  • US 5,866,887 A
  • Filed: 09/03/1997
  • Issued: 02/02/1999
  • Est. Priority Date: 09/04/1996
  • Status: Expired due to Term
First Claim
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1. An apparatus for detecting a human body passing a specific area to be monitored including a ceiling and a floor, and for determining a number of human bodies passing the specific area, said apparatus comprising:

  • a plurality of distance variation measuring sensors provided in a plurality of rows and to be positioned on the ceiling of the specific area to be monitored, wherein each distance variation measuring sensor includes a light emitter, a light receiver, a focus, and a detection area, and is operable for detecting the human body and for measuring a rate of change relative to time in distance between said each distance variation measuring sensor and the human body; and

    judging means for determining the number of human bodies passing the specific area on the basis of a number of sensors which have detected any human body in each row of sensors and for determining a traveling direction of the human body by comparing a rate of change relative to time in distance measured by one of said plurality of sensors in one of said rows with a rate of change relative to time in distance measured by another of said plurality of sensors in another of said rows;

    wherein the detection area of each sensor extends from said each sensor to a height to be set so as to correspond to the floor of the specific area to be monitored and the focus of each sensor is at a distance from said each sensor to be set so as to correspond to a distance between said each sensor and a height between shoulder height and head height of an average adult person.

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