System for monitoring vehicles having a start and a stop pair of beams
First Claim
1. A beam system for monitoring vehicles which comprisesa) 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.
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Accused Products
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.
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Citations
9 Claims
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1. 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.
Specification