Method and device for keeping watch over premises by having differing activation times of sensors
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United States of America Patent
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Aug 29, 2000
Grant Date -
N/A
app pub date -
Sep 20, 1999
filing date -
Mar 19, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The invention concerns a system for keeping watch over premises, comprising: elements (LA-LD) for controlling access to these premises; elements (V1-V3, P1-P8) for detecting intrusion or unauthorized presence in these premises, including perimeter detection elements (P1-P8) for detecting any intrusion in a predetermined perimeter around these premises, volumetric detection elements (V1-V3) for detecting any presence in predetermined zones of these premises. The access controlling elements (LA-LE) and the intrusion detecting elements (V1-V3, P1-P8) co-operate to put off the activation of some volumetric detection elements (V1-V3) for a predetermined exception delay whenever the access controlling elements (LA-LE) validate, during watch time, the presence of an authorized person or an access request from same. The invention is applicable to the watch and security of small buildings and professional and administrative offices.
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