Motion Sensor for Occupancy Detection and Intrusion Detection
First Claim
1. A motion sensor comprising:
- an infrared detector comprising a first set of detector elements and a second set of detector elements;
a first optical subsystem adapted to direct infrared radiation from a first row of monitored volumes spaced at a first pitch in a first direction onto the first set of detector elements, and to direct infrared radiation from a second row of monitored volumes spaced at the first pitch in the first direction, and offset from the first row of monitored volumes in the first direction, onto the second set of detector elements, the first row and the second row each consisting of a first number of monitored volumes; and
a second optical subsystem adapted to direct infrared radiation from a third row of monitored volumes spaced at a second pitch in the first direction onto the first set of detector elements, and to direct infrared radiation from a fourth row of monitored volumes spaced at the second pitch in the first direction, and offset from the third row of monitored volumes in the first direction, onto the second set of detector elements, the third row and the fourth row each consisting of a second number of monitored volumes, the second number being different than the first number.
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Accused Products
Abstract
A motion sensor has an infrared detector with a first set of detector elements coupled to a first channel and a second set of detector elements coupled to a second channel. A first optical subsystem directs infrared radiation from a first number of monitored volumes to the infrared detector and a second optical subsystem directs infrared radiation from a second number of monitored volumes to the infrared detector. Intrusion detection circuitry is coupled to both channels of the infrared detector and selects a set of peaks in the first channel and the second channel. It then calculates an alternation score based on a number of alternating peaks in the set of peaks, and indicates an intrusion detection based, at least in part, on the alternation score. The circuitry also determines a peak-to-peak period for the first channel and calculates a slope-synchrony measurement to modify the alternation score.
8 Citations
20 Claims
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1. A motion sensor comprising:
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an infrared detector comprising a first set of detector elements and a second set of detector elements; a first optical subsystem adapted to direct infrared radiation from a first row of monitored volumes spaced at a first pitch in a first direction onto the first set of detector elements, and to direct infrared radiation from a second row of monitored volumes spaced at the first pitch in the first direction, and offset from the first row of monitored volumes in the first direction, onto the second set of detector elements, the first row and the second row each consisting of a first number of monitored volumes; and a second optical subsystem adapted to direct infrared radiation from a third row of monitored volumes spaced at a second pitch in the first direction onto the first set of detector elements, and to direct infrared radiation from a fourth row of monitored volumes spaced at the second pitch in the first direction, and offset from the third row of monitored volumes in the first direction, onto the second set of detector elements, the third row and the fourth row each consisting of a second number of monitored volumes, the second number being different than the first number. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of detecting motion comprising:
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receiving infrared radiation from a first row of monitored volumes spaced at a first pitch in a first direction, the first row of monitored volumes consisting of a first number of monitored volumes; receiving infrared radiation from a second row of monitored volumes spaced at the first pitch in the first direction, and offset from the first row of monitored volumes in the first direction, the second row of monitored volumes consisting of the first number of monitored volumes; receiving infrared radiation from a third row of monitored volumes spaced at a second pitch in the first direction, the third row of monitored volumes consisting of a second number of monitored volumes, the second number being different than the first number; receiving infrared radiation from a fourth row of monitored volumes spaced at the second pitch in the first direction, and offset from the third row of monitored volumes in the first direction, the fourth row of monitored volumes consisting of the second number of monitored volumes; directing the infrared radiation from the first row of monitored volumes and the third row of monitored volumes onto a first set of detector elements of an infrared detector; directing the infrared radiation from the second row of monitored volumes and the fourth row of monitored volume onto a second set of detector elements of the infrared detector; analyzing a first signal generated by the first set of detector elements of the infrared detector and a second signal generated by the second set of detector elements of the infrared detector to detect movement of a warm object through at least a portion of the first row, the second row, the third row, and/or the fourth row of monitored volumes; and indicating that the movement of the warm object has been detected. - View Dependent Claims (17, 18, 19, 20)
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Specification