Human presence detector suitable for concealment and using a shaped microwave beam
First Claim
1. A presence detector unit (PDU) of the type relying on microwave radiation, and providing a signal indicating movement within a defined space when such movement occurs, comprising:
- a) a housing having an interior space, at least a portion of which is made from material that blocks microwave radiation, and having a first side substantially transparent to microwave radiation;
b) a source of microwave radiation within the housing and forming a beam of microwave radiation directed through the first side;
c) a detector of changes in microwave radiation outside the housing; and
d) an adjustable beam occlusion structure (ABOS) supported by the housing and blocking a portion of the microwave radiation emanating from the source and through the first side, and including at least one shutter movable within the microwave radiation beam, said shutter having a slot, and said shutter further including a fastener passing through the slot and attached to the housing.
1 Assignment
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Accused Products
Abstract
A presence detector unit (PDU) of the type relying on microwave radiation provides a signal indicating movement within a defined space when such movement occurs. A source of microwave radiation within a housing projects a beam of microwave radiation directed through a side of the housing to suffuse at least a portion of the defined space. A detector within the housing senses changes in microwave radiation reflected back toward the detector. An adjustable beam occlusion structure is supported by the housing and blocks a portion of the microwave radiation emanating from the source and through the side of the housing.
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Citations
13 Claims
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1. A presence detector unit (PDU) of the type relying on microwave radiation, and providing a signal indicating movement within a defined space when such movement occurs, comprising:
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a) a housing having an interior space, at least a portion of which is made from material that blocks microwave radiation, and having a first side substantially transparent to microwave radiation; b) a source of microwave radiation within the housing and forming a beam of microwave radiation directed through the first side; c) a detector of changes in microwave radiation outside the housing; and d) an adjustable beam occlusion structure (ABOS) supported by the housing and blocking a portion of the microwave radiation emanating from the source and through the first side, and including at least one shutter movable within the microwave radiation beam, said shutter having a slot, and said shutter further including a fastener passing through the slot and attached to the housing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A presence detector unit (PDU) of the type relying on microwave radiation, and providing a signal indicating movement within a defined space when such movement occurs, comprising:
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a) a housing having an interior space, at least a portion of which is made from material that blocks microwave radiation, and having a first side substantially transparent to microwave radiation; b) a source of microwave radiation within the housing and forming a beam of microwave radiation directed through the first side; c) a detector of changes in microwave radiation outside the housing; and d) an adjustable beam occlusion structure (ABOS) supported by the housing and blocking a portion of the microwave radiation emanating from the source and through the first side, and including at least one plate transparent to microwave radiation overlaying the first side, and wherein the ABOS comprises a foil of the type blocking microwave radiation, said foil adhering to the plate, and said foil having an opening within the beam for allowing passage of a portion the beam. - View Dependent Claims (10)
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11. A presence detector unit (PDU) of the type relying on microwave radiation, and providing a signal indicating movement within a defined space when such movement occurs, comprising:
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a) a housing having an interior space, at least a portion of which is made from material that blocks microwave radiation, and having a first side substantially transparent to microwave radiation; b) a source of microwave radiation within the housing and forming a beam of microwave radiation directed through the first side; c) a detector of changes in microwave radiation outside the housing; and d) an adjustable beam occlusion structure (ABOS) supported by the housing and blocking a portion of the microwave radiation emanating from the source and through the first side, said PDU adapted for detecting entry through a door into a space for occupancy, and further comprising; e) a first wall having an entry area therein; f) a second wall adjoining the first wall at a point spaced from the door; g) a third wall adjoining the first wall and spaced from the door, and placing the door between the second and third walls, said third wall supporting the PDU with the beam of microwave radiation directed to pass across the door and impinge on the second wall; and h) beam occlusion material on the second wall blocking passage of microwave radiation emitted by the source through the second wall. - View Dependent Claims (12, 13)
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Specification