System for monitoring vehicles having a start and a stop pair of beams
OwnerRuediger H. Gebert, Carl A. Van Maarseveeninventors
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Abstract
A beam system for traffic monitoring which comprises transmitters for two pairs of beams which constitute a start and a stop pair of beams which in use are spaced from each other by a known distance; receivers for each beam; electronic means connected to detect when reception of the beams by the receivers are interrupted; and means for manipulating data including that derived from the receivers according to desired algorithms, wherein there are provided two pairs of beams, one pair of beams being located at a different level from the other with means for comparing speed or other quantities with the option of rejecting the detection if they do not sufficiently agree.
Claims9
A beam system for monitoring vehicles which comprises
- a) a transmitter for a higher and a lower pair of beams, both beam pairs having a start beam and a stop beam, said start and said stop beams being spaced from each other by a known measuring distance,
- b) a receiver for each beam,
- c) electronic means which detect when reception of one or more of the beams by one of said receivers is interrupted,
- d) means for manipulating data derived from the receivers according to algorithms for monitoring vehicles and,
- e) means for comparing and evaluating vehicle monitoring detections made between said higher and said lower pairs of beams.
Dependencies are inferred from the claim text.