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Infrared intruder detection system

  • US 4,704,533 A
  • Filed: 04/08/1986
  • Issued: 11/03/1987
  • Est. Priority Date: 04/15/1985
  • Status: Expired due to Fees
First Claim
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1. An infrared intruder detection system comprising:

  • a first means for sensing infrared radiation incident on a first location, said first infrared-sensing means producing either a positive or negative output signal +A or -A in response to the infrared radiation sensed;

    a second means for sensing infrared radiation incident on a second location spaced from the first location, said second infrared-sensing means producing either a positive or a negative output signal +B or -B in response to the infrared radiation sensed; and

    sequence detection means for receiving the output signals from the first and second means for sensing infrared radiation, and for producing an alarm output indicating the presence of an intruder when an output signal sequence of +A followed by +A and +B, followed by +B is detected, or when an output signal sequence of -A, followed by -A and -B, followed by -B is detected.

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