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Method and apparatus for using optical signal time-of-flight information to facilitate obstacle detection

  • US 7,221,288 B2
  • Filed: 10/25/2004
  • Issued: 05/22/2007
  • Est. Priority Date: 10/25/2004
  • Status: Active Grant
First Claim
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1. A method comprising:

  • sourcing a plurality of optical signals, wherein;

    at least some of the plurality of optical signals are at different angles of travel from one another;

    at least some of the plurality of optical signals are directed towards an area comprising a movable barrier-controlled point of passage;

    detecting reflections of at least some of the plurality of optical signals;

    determining a time of flight for at least some of the optical signals;

    using the time of flight to detect a likely presence of an obstacle in a pathway of the movable barrier.

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