Sheet detection system
AssigneePerkinElmer Detection Systems, Inc.
InventorPaul J. Bjorkholm
Life of this patent
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Abstract
A detection system for detecting sheets of material includes a device for moving along a path a container which can harbor a sheet of material sought to be detected; an X-ray scanner having a beam for scanning across the path of the container through a predetermined angle and a device for moving the scanner to shift the origin of the scanning beam to align during at least a portion of the scan the scanning beam with the sheet for producing a high projected density contrasted with its surroundings.
Claims18
A detection system for detecting sheets of material comprising:
- means for moving along a path a container which can harbor a sheet of material;
- an X-ray scanner having a scanning beam for scanning across the path of said container through a predetermined angle;
- and
- means for shifting the origin of said scanning beam to align during at least a portion of the scan said scanning beam with a sheet for producing a high projected density contrast with its surroundings.
A detection system for detecting sheets of material comprising:
- means for moving along a path a container which can harbor a sheet of material;
- an X-ray scanner having a scanning beam for scanning across the path of said container through a predetermined angle;
- means for shifting the origin of said scanning beam to align during at least a portion of the scan said scanning beam with a sheet for producing a high projected density contrast with its surroundings;
- a detector for detecting X-ray energy transmitted by the sheet;
- and
- means for determining whether the X-ray energy transmitted by the sheet represents an areal density within a target envelope of areal densities.
An X-ray scanning system for detecting sheets of material in a container moving along a path, the system comprising:
- an X-ray source having a scanning beam for scanning across the path of the container through a predetermined angle, said X-ray source being movable relative to the path of the container to align said scanning beam with a sheet for producing a high projected density contrast with its surroundings.
Dependencies are inferred from the claim text.