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Scanning seismic intrusion detection method and apparatus

  • US 4,374,378 A
  • Filed: 01/28/1981
  • Issued: 02/15/1983
  • Est. Priority Date: 01/28/1981
  • Status: Expired due to Fees
First Claim
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1. In a method of intrusion detection, the steps of:

  • multiplexing into a receiver at a central location individual signals developed by vibrations sensed by individual ones of a plurality of seismic sensors in an array disposed in a monitored region within which intrusion by surface movement or tunneling is to be detected to obtain a scan of the seismic sensors in the array;

    automatically stopping the multiplexing scan on a first individual sensor having a received vibration signal exceeding a predetermined threshold value to indicate the location of an intrusion; and

    sequentially selecting the received signal developed on second and third seismic sensors in the vicinity of said first sensor to more precisely determine the location of the intrusion.

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