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Device, system and method for monitoring a predetermined space

  • US 9,881,469 B2
  • Filed: 05/27/2013
  • Issued: 01/30/2018
  • Est. Priority Date: 05/31/2012
  • Status: Active Grant
First Claim
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1. A method for monitoring a predetermined space, comprising:

  • a) using at least one first volumetric sensor for detecting whether there has been a movement in an authorized zone of said space and outputting a first movement signal when there has been a movement in the authorized zone;

    b) using at least one second volumetric sensor for detecting whether there has been a movement in an unauthorized zone of said space and outputting a second movement signal when there has been a movement in the unauthorized zone;

    c) determining whether the first movement signal or the second movement signal has been output;

    d1) instructing a status variable to adopt a first value if either the first movement signal or the second movement signal has been output, indicative of a presence of at least one person in said space, and to adopt a second value if neither of the first movement signal or the second movement signal has been output, indicative of an absence of persons in said space;

    d2) if said status variable has the first value, activating a countdown;

    d3) detecting a further movement in either of the authorized zone or the unauthorized zone;

    e) if said status variable has said second value and said further movement was detected in said unauthorized zone, making an alarm indication;

    f) if said status variable has said second value and said further movement was detected in the authorized zone, setting the status variable to the first value and activating the countdown;

    g) if said status variable has said first value and the further movement was detected either in the authorized zone or in the unauthorized zone, resetting and reactivating the countdown;

    h) if the countdown has finished without detection of the further movement in either the authorized zone or the unauthorized zone, setting the status variable to the second value.

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