Method and apparatus for using optical signal time-of-flight...

Details Method and apparatus for using optical signal time-of-flight... Method and apparatus for using optical signal time-of-flight...

2007-05-22

2007-05-22

Pham, Toan N. (Department: 2612)

Communications: electrical

Vehicle detectors

C340S545100, C340S545300, C250S221000, C250S573000, C250S575000, C250S578100

Reexamination Certificate

active

10972922

ABSTRACT:
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.

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