Quad element intrusion detection
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United States of America Patent
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Oct 16, 1990
Grant Date -
N/A
app pub date -
Feb 28, 1989
filing date -
Feb 28, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dual channel intrusion detection system comprising first and second radiation sensors. Each sensor has a pair of elements viewing adjacent zones of the protected area, the zones being slightly offset from each other in the direction of expected intruder movement. Sequence detection is provided for producing an intruder-present signal in response to simultaneous actuation of one element of each sensor when preceded by actuation of the other element of one of the sensors. Additional immunity from false triggering is obtainable if this sequence must be followed by actuation of the other element of the second sensor.
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