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US 6,737,665 B1Granted
Edge detector
AssigneeOtm Technologies Ltd.
InventorsUri Kinrot, Opher Kinrot
Life of this patent
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Abstract
A method of detecting the passage of an edge of a moving sheet of material at a position comprising: monitoring a state of motion at a position; and determining a time of an edge of the sheet at a position as a time at which a change in a state of motion at the position is detected.
Claims27
A method of detecting the passage of an edge of a moving sheet of material at a position, comprising:
- illuminating a position with radiation;
- detecting whether motion exists at the position, comprising determining if the power of Doppler shifted energy within a band of Doppler frequencies of radiation reflected at the position is above a threshold;
- and
- determining a time of passage of an edge of the sheet at the position as a time at which a change in whether motion exists at the position is detected.
1 more element
Dependencies are inferred from the claim text.