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Infrared intrusion detector with a plurality of infrared ray detecting elements

  • US 4,912,748 A
  • Filed: 09/23/1988
  • Issued: 03/27/1990
  • Est. Priority Date: 09/26/1987
  • Status: Expired due to Term
First Claim
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1. An infrared intrusion detector with a plurality of infrared detecting elements comprising:

  • an optical means for condensing infrared rays from a detecting zone, the detecting zone comprising a plurality of divided areas corresponding to each of said infrared ray detecting elements respectively, wherein said respective infrared detecting elements receive the condensed infrared rays from each of the divided detecting areas;

    amplifying means for amplifying outputs from said respective infrared ray detecting elements;

    signal processing means connected to said amplifying means for processing the amplified outputs and deriving respective output signals;

    discriminating means connected to said signal processing means for comparing peak levels and times of the amplified outputs using the output signals from said signal processing means and thereby discriminating between the presence or absence of a personal body in the detecting zone, wherein the difference in time between any two of the amplified outputs is compared to determine whether or not the time difference is within a predetermined range; and

    output means for receiving a signal from said discriminating means denoting the presence of a personal body in the detecting zone.

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