PIR motion sensor
First Claim
1. A passive infrared (IR) motion sensor, comprising:
- at least a first IR detector outputting a first signal having a first frequency when a moving object passes in a detection volume of the first detector;
at least a second IR detector outputting a second signal having a second frequency when the moving object passes in a detection volume of the second detector, the second frequency being different than the first; and
a processing system receiving the first and second signals and at least partially based on the first and second signals, outputting a detection signal representative of the moving object.
1 Assignment
0 Petitions
Accused Products
Abstract
A passive infrared sensor uses two detectors having elements of different configurations such that each element outputs a respective frequency when an object moves in front of it. Based on the presence of two frequencies with similar peak and/or slope characteristics, a motion signal is output to, e.g., activate an alarm. In another embodiment the detectors have plural elements with the elements of one detector being wired in a dimension that is orthogonal to the dimension in which the elements of the other detector are wired. The signals from the detectors are combined to determine motion and size of object. The detector elements can also be configured differently from each other as in the first embodiment, and the polarities of signals can be used to determine direction of motion.
-
Citations
39 Claims
-
1. A passive infrared (IR) motion sensor, comprising:
-
at least a first IR detector outputting a first signal having a first frequency when a moving object passes in a detection volume of the first detector;
at least a second IR detector outputting a second signal having a second frequency when the moving object passes in a detection volume of the second detector, the second frequency being different than the first; and
a processing system receiving the first and second signals and at least partially based on the first and second signals, outputting a detection signal representative of the moving object. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method for discriminating a moving object in a monitored space from a non-moving object characterized by non-constant radiation, comprising:
-
receiving a first frequency from a first passive IR detector;
receiving a second frequency from a second passive IR detector, the first and second frequencies not being equal; and
outputting a signal indicating the presence of the moving object only if both the first and second frequencies are substantially simultaneously received, and otherwise not outputting the signal indicating the presence of the moving object. - View Dependent Claims (9, 10, 11, 12)
-
- 13. A processing system connected to first and second PIR detectors for outputting a detect signal only if signals received from both detectors have different frequencies from each other.
-
16. A motion sensor, comprising:
-
at least a first passive IR detector having at least two rows of elements with at least two elements per row, the first passive IR detector monitoring a first subvolume of space;
at least a second passive IR detector having at least two elements, the second passive IR detector monitoring a second subvolume of space; and
an optics system at least partially optically superposing the first and second subvolumes. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
-
-
24. A PIR sensor, comprising:
-
at least a first detector configured for outputting signals representative of at least one of at least two points along a first dimension defined by the first detector, the first detector receiving IR radiation from a first monitored sub-volume of space; and
at least a second detector configured for outputting signals representative of at least one of at least two points along a second dimension defined by the second detector, the second dimension being different from the first dimension, the second detector receiving IR radiation from a second monitored sub-volume of space that at least partially overlaps the first monitored sub-volume of space. - View Dependent Claims (25, 26, 27, 28, 29, 30)
-
-
31. A system for discriminating a moving object in a monitored space from a non-moving object characterized by non-constant radiation, comprising:
-
means for receiving a first frequency from a first passive IR detector;
means for receiving a second frequency from a second passive IR detector, the first and second frequencies not being equal; and
means for outputting a signal indicating the presence of the moving object only if both the first and second frequencies are substantially simultaneously received, and otherwise not outputting the signal indicating the presence of the moving object. - View Dependent Claims (32, 33, 34, 35)
-
-
36. A motion sensor, comprising:
-
at least a first detector means monitoring a first subvolume of space and outputting signals representative of points along a first dimension; and
at least a second detector means monitoring a second subvolume of space at least partially superposed with the first sub-volume of space, the second detector means outputting signals representative of points along a second dimension, the first and second dimensions being different from each other. - View Dependent Claims (37, 38, 39)
-
Specification