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Detection device and method for detecting objects subject to cyclic or repetitive motion

  • US 7,732,797 B2
  • Filed: 09/07/2005
  • Issued: 06/08/2010
  • Est. Priority Date: 09/08/2004
  • Status: Active Grant
First Claim
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1. A device for detecting the presence or absence of an object which has repetitive motion, the device comprisinga receiver for receiving a signal reflected or emitted from the object;

  • andcircuitry for determining the presence or absence of the object to be detected, characterised in thatthe circuitry is configured to record the signal from the receiver as a pattern of data during at least part of the repetitive motion of the object during an inspection of the object, and to compare the data with a data pattern recorded during a previous repetitive motion of the object during the same inspection of the object, and to produce an output signal based on the comparison.

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