Sheet detection system
First Claim
Patent Images
1. 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.
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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.
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Citations
18 Claims
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1. A detection system for detecting sheets of material comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A detection system for detecting sheets of material comprising:
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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. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. 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.
Specification