Patent ID: 8654197

Claim:
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.