System and method for occupancy detection
First Claim
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1. A detection system, comprising:
- a plurality of sensors, comprising;
an entry sensor having a field of view oriented to detect object entry into an occupancy volume via an entry portion of the occupancy volume, object entry corresponding to a first state of the occupancy volume in which an object is present within the occupancy volume and at least a portion of a security scan of the object is performed to detect unwanted materials, wherein the entry sensor includes an absorber box to block unwanted break-beam responses and to fan sensor break-beams across different detection areas; and
an exit sensor having a field of view oriented to detect object exit from the occupancy volume via an exit portion of the occupancy volume, object exit corresponding to a second state of the occupancy volume in which the object is absent from the occupancy volume;
at least one approach sensor having a field of view oriented to detect object approach relative to the entry portion of the occupancy volume; and
at least one retreat sensor having a field of view oriented to detect object retreat relative to the exit portion of the occupancy volume, wherein an occurrence of the first state of the occupancy volume followed by the second state of the occupancy volume corresponds to an occupancy volume crossed state in which the object is determined to have crossed the occupancy volume.
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Abstract
A detection system includes a plurality of sensors including an entry sensor having a field of view oriented to detect object entry with respect to an entry portion of an occupancy volume, and an exit sensor having a field of view oriented to detect object exit with respect to an exit portion of the occupancy volume, the exit portion different than the entry portion. The detection system further includes at least one approach sensor having a field of view oriented to detect object approach relative to the entry portion of the occupancy volume, and at least one retreat sensor having a field of view oriented to detect object retreat relative to the exit portion of the occupancy volume.
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Citations
25 Claims
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1. A detection system, comprising:
a plurality of sensors, comprising; an entry sensor having a field of view oriented to detect object entry into an occupancy volume via an entry portion of the occupancy volume, object entry corresponding to a first state of the occupancy volume in which an object is present within the occupancy volume and at least a portion of a security scan of the object is performed to detect unwanted materials, wherein the entry sensor includes an absorber box to block unwanted break-beam responses and to fan sensor break-beams across different detection areas; and an exit sensor having a field of view oriented to detect object exit from the occupancy volume via an exit portion of the occupancy volume, object exit corresponding to a second state of the occupancy volume in which the object is absent from the occupancy volume; at least one approach sensor having a field of view oriented to detect object approach relative to the entry portion of the occupancy volume; and at least one retreat sensor having a field of view oriented to detect object retreat relative to the exit portion of the occupancy volume, wherein an occurrence of the first state of the occupancy volume followed by the second state of the occupancy volume corresponds to an occupancy volume crossed state in which the object is determined to have crossed the occupancy volume. - View Dependent Claims (2, 3, 4, 5, 6, 19, 20, 21, 22, 23, 24, 25)
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7. A detection system, comprising:
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a first sensor having a first field of view oriented to detect object entry into an occupancy volume via an entry portion of the occupancy volume, object entry corresponding to a first state of the occupancy volume in which an object is present within the occupancy volume and at least a portion of a security scan of the object is performed to detect unwanted materials, wherein the first sensor includes an absorber box to block unwanted break-beam responses and to fan sensor break-beams across different detection areas; a second sensor having a second field of view oriented to detect object exit from the occupancy volume via an exit portion of the occupancy volume, object exit corresponding to a second state of the occupancy volume in which the object is absent from the occupancy volume; a third sensor having a third field of view oriented to detect object approach relative to the occupancy volume; a fourth sensor having a fourth field of view oriented to detect object retreat relative to the occupancy volume, wherein an occurrence of the first state of the occupancy volume followed by the second state of the occupancy volume corresponds to an occupancy volume crossed state in which the object is determined to have crossed the occupancy volume. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A detection system, comprising:
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a first sensor having a first field of view oriented to detect object entry into a portal zone from a lane entry zone adjacent to the portal zone at an entry portion of the portal zone, object entry corresponding to a first state of the portal zone in which an object is present within the portal zone and at least a portion of a security scan of the object is performed to detect unwanted materials, wherein the first sensor includes an absorber box to block unwanted break-beam responses and to fan sensor break-beams across different detection areas; a second sensor having a second field of view oriented to detect object exit from the portal zone into a lane exit zone adjacent to the portal zone at an exit portion of the portal zone opposing the entry portion of the portal zone, object exit corresponding to a second state of the portal zone in which the object is absent from the portal zone; a third sensor having a third field of view oriented to detect object approach toward the portal zone within the lane entry zone; and a forth sensor having a forth field of view oriented to detect object retreat from the portal zone within the lane exit zone, wherein an occurrence of the first state of the portal zone followed by the second state of the portal zone corresponds to a portal zone crossed state in which the object is determined to have crossed the portal zone. - View Dependent Claims (15, 16, 17, 18)
wherein the first, third, and fourth sensors are substantially aligned with the first side and the second, fifth, and sixth sensors are substantially aligned with the second side.
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16. The system of claim 15, further comprising:
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a first vertical body positioned along the first side of the portal zone at the entry portion of the portal zone adjacent to the lane entry zone; and a second vertical body positioned along the second side of the portal zone at the exit portion of the portal zone adjacent to the lane exit zone, wherein the first, third, and forth sensors are mounted to the first vertical body and the second, fifth, and sixth sensors are mounted to the second vertical body.
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17. The system of claim 16, wherein the first sensor is mounted within a first absorber box to reduce the longitudinal width of the first field of view, the second sensor is mounted within a second absorber box to reduce the longitudinal width of the second field of view, the third sensor is mounted within a third absorber box to further reduce the third field of view and the fourth sensor is mounted within a fourth absorber box to further reduce the fourth field of view and the fifth sensor is mounted within a fifth absorber box to further reduce the fifth field of view and the sixth sensor is mounted within a sixth absorber box to further reduce the fifth field of view.
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18. The system of claim 17, wherein the third field of view is further oriented toward ground level at one side of the late entry zone and the fifth field of view is further oriented toward ground level at another side of the late entry zone opposing the one side of the late entry zone, and the forth field of view is further oriented toward ground level at one side of the late exit zone and the sixth field of view is further oriented toward ground level at another side of the late exit zone opposing the one side of the lane exit zone.
Specification