Passive infra-red detectors
First Claim
1. A passive infra-red detector comprising:
- at least three sub-detectors, each of said at least three sub-detectors being operative to receive infra-red radiation from a corresponding one of at least three sub fields-of-view, each of said at least three sub fields-of-view being exclusively defined by an optical element which does not define any other of said at least three sub fields of view, said at least three sub fields-of-view being angled with respect to each other; and
reduced false alarm signal processing circuitry, receiving output signals from said at least three sub-detectors, noting at least one of time durations of said output signals of at least two adjacent ones of said at least three sub-detectors and time differences between receipt of said output signals from said at least two adjacent ones of said at least three sub-detectors, and providing a motion detection output,said reduced false alarm signal processing circuitry being operative to eliminate at least some false alarms at least based on at least one sensed time relationship among at least two of said at least one of time durations of said output signals and said time differences between receipt of said output signals.
2 Assignments
0 Petitions
Accused Products
Abstract
A passive infra-red detector including at least three sub-detectors, each sub-detector being operative to receive infra-red radiation from a corresponding one of at least three sub fields-of-view, each sub field-of-view being exclusively defined by an optical element which does not define any other sub field of view, the sub fields-of-view being angled with respect to each other, adjacent ones of the sub fields-of-view being separated by a gap of no more than 30 degrees and at least one of the sub fields-of-view having at least one of the following characteristics: extending over no more then 45 degrees in azimuth; and including not more than three azimuthally distributed detection zones, and signal processing circuitry, operative to receive output signals from the sub detectors and to provide a motion detection output.
-
Citations
120 Claims
-
1. A passive infra-red detector comprising:
-
at least three sub-detectors, each of said at least three sub-detectors being operative to receive infra-red radiation from a corresponding one of at least three sub fields-of-view, each of said at least three sub fields-of-view being exclusively defined by an optical element which does not define any other of said at least three sub fields of view, said at least three sub fields-of-view being angled with respect to each other; and reduced false alarm signal processing circuitry, receiving output signals from said at least three sub-detectors, noting at least one of time durations of said output signals of at least two adjacent ones of said at least three sub-detectors and time differences between receipt of said output signals from said at least two adjacent ones of said at least three sub-detectors, and providing a motion detection output, said reduced false alarm signal processing circuitry being operative to eliminate at least some false alarms at least based on at least one sensed time relationship among at least two of said at least one of time durations of said output signals and said time differences between receipt of said output signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
-
-
33. A passive infra-red detector comprising:
-
at least three sub-detectors, each operative to receive infra-red radiation from a corresponding one of at least three sub fields-of-view, said at least three sub fields-of-view being substantially non-overlapping and being angled with respect to each other; and signal processing circuitry, receiving output signals from said at least three sub-detectors and noting time differences between receipt of said output signals from adjacent ones of said at least three sub-detectors and providing a motion detection output in response to receipt of said output signals from said adjacent ones of said at least three sub-detectors having a time difference which is at least within certain predetermined limits. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
-
-
52. A passive infra-red detector comprising:
-
at least three sub-detectors, each operative to receive infra-red radiation from a corresponding one of at least three sub fields-of-view, said at least three sub fields-of-view being angled with respect to each other; and signal processing circuitry, receiving output signals from at least two adjacent ones of said at least three sub-detectors, noting time durations of said output signals and providing a motion detection output in response to receipt of said output signals from said at least two adjacent ones of said at least three sub-detectors having respective time durations, the ratio of which is within predetermined limits. - View Dependent Claims (53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72)
-
-
73. A passive infra-red detector comprising:
-
at least three sub-detectors, each operative to receive infra-red radiation from a corresponding one of at least three sub fields-of-view, said at least three sub fields-of-view being angled with respect to each other; and signal processing circuitry, receiving output signals from at least two adjacent ones of said at least three sub-detectors, noting time differences between receipt of said output signals and time durations of said output signals and providing a motion detection output in response to receipt of said output signals from at least two adjacent ones of said at least three sub-detectors having respective time durations and a time difference therebetween, said time durations and said time difference therebetween having a time relationship therebetween which meets at least one predetermined criterion. - View Dependent Claims (74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96)
-
-
97. A passive infra-red detector comprising:
-
at least two sub-detectors each operative to receive infra-red radiation from a corresponding one of at least two sub fields-of-view; and signal processing circuitry, receiving output signals from said at least two sub-detectors and noting time relationships of said output signals from said at least two sub-detectors and providing a motion detection output in response to receipt of said output signals from said at least two sub-detectors having a time relationship which meets at least one predetermined criterion, at least one of said at least one predetermined criterion being time duration of at least one of said output signals. - View Dependent Claims (98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120)
-
Specification