E - Fixed Constructions – 01 – F
Patent
E - Fixed Constructions
01
F
E01F 13/04 (2006.01) G01S 17/02 (2006.01) G01S 17/93 (2006.01)
Patent
CA 2523733
One or more optical signals (wherein at least some of a plurality of optical signals are at different angles of travel with respect to one another and are directed towards an area comprising a movable barrier-controlled point of passage) create reflections when striking passageway boundaries as correspond to a given movable barrier. Obstacles in the pathway also give rise to reflections. By determining a time-of flight for such reflections, one can detect a likely presence of an obstacle in such a pathway. Pursuant to one approach, such time-of flight information can further provide information regarding a likely size of such an obstacle.
Fitzgibbon James J.
Olmsted Robert J.
Macrae & Co.
The Chamberlain Group Inc.
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