Motion sensor with ultrasonic modulation
First Claim
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5. A motion sensor comprising:
- a) a motion sensor unit for controlling a load in response to detected motion, the motion sensor unit comprising;
I) an ultrasonic sensor for detecting a first level of motion;
ii) a PIR sensor for detecting a second level of motion, wherein the motion sensor unit is configured to close a load circuit when the first level of motion and the second level of motion are above a threshold value; and
b) means for turning off the ultrasonic sensor when ultrasonic radiation emitted from a source other than the ultrasonic sensor is detected.
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Abstract
A dual-technology motion sensor with an ultrasonic sensor element (transducer) and a PIR sensor element is disclosed. The dual-technology motion sensor is configured to modulate ultrasonic radiation emitted from the ultrasonic sensor element when the motion sensor detects a condition under which other wireless devices, especially ultrasound-based wireless devices, are in operation, thereby eliminating problems associated with interference.
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Citations
22 Claims
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5. A motion sensor comprising:
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a) a motion sensor unit for controlling a load in response to detected motion, the motion sensor unit comprising; I) an ultrasonic sensor for detecting a first level of motion; ii) a PIR sensor for detecting a second level of motion, wherein the motion sensor unit is configured to close a load circuit when the first level of motion and the second level of motion are above a threshold value; and b) means for turning off the ultrasonic sensor when ultrasonic radiation emitted from a source other than the ultrasonic sensor is detected. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A system comprising:
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a) a motion sensor unit for controlling a load in response to detected motion, the motion sensor unit comprising; I) an ultrasonic sensor for detecting a first level of motion from ultrasonic radiation emitted from the ultrasonic sensor; ii) a PIR sensor for detecting a second level of motion, wherein the motion sensor unit is configured to close a load circuit when the first level of motion and the second level of motion are above a threshold value; b) a communication device, wherein the communication device emits ultrasonic radiation; c) means for detecting the ultrasonic radiation emitted from the communication device; and d) means for modifying the ultrasonic radiation emitted from the ultrasonic sensor in response to the detected ultrasonic radiation emitted from the communication device. - View Dependent Claims (1, 4, 12, 13, 14, 15, 16, 17)
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16-1. The system of claim 11, further comprising a user interface for selecting the threshold value.
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18. A method comprising:
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a) detecting a first level of motion from ultrasonic radiation emitted from an ultrasonic sensor element; b) detecting a second level of motion using a PIR sensor element; c) closing a load circuit when the first level of motion and the second level of motion are above a first threshold value; d) detecting one or more conditions that indicate an ultrasonic communication device is in operation in the vicinity of a motion sensor with the an ultrasonic sensor element; and e) modulating ultrasonic radiation emitted from the ultrasonic sensor in response to the one or more detected conditions. - View Dependent Claims (2, 3, 20, 21, 22)
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21-2. The method of claim 18, further detecting one or more conditions comprises measuring a motion or activity at a second threshold value that is greater than the first threshold value.
Specification