Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1994-07-01
1996-12-03
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
With particular system function
340506, 340522, 340541, 340552, 340556, 340565, G08B 2906
Patent
active
055812368
ABSTRACT:
A multisensor intrusion detection system having greatly improved immunity to false alarms is disclosed. This system employs a first sensor for sensing an intrusion in a volume of space by a first physical phenomenon and a second sensor for detecting an intrusion in the volume of space by a second physical phenomenon different from the first physical phenomenon. The first sensor generates a first signal in response to the detection of an intrusion into the volume of space, and the second sensor generates a second signal in response to a detection of an intrusion. A microcontroller generates an alarm signal upon the occurrence of one first signal and one second signal within a first interval, the occurrence of another first signal within a subsequent second interval and the occurrence of another second signal within a third subsequent interval.
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Hoseit Paul M.
Whiting Gordon S.
C & K Systems Inc.
Hofsass Jeffery
Wu Daniel J.
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