Method to enable small vehicles to trip a traffic light inductive loop sensor
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United States of America Patent
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Sep 1, 2015
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N/A
app pub date -
May 13, 2014
filing date -
May 17, 2013
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Abstract
A method to allow vehicles of low metallic mass to trip an inductive loop detector at a traffic light by first matching the loop detector's running frequency, then, while monitoring, raising the frequency of the loop detector through normal transformer action with a transducer that is in close proximity to the loop detector, until the frequency of the transmissions from the transducer and that of the loop detector just start to diverge. This is the point at which maximal influence is achieved over the loop detector's running frequency commensurate with the transformer couple that exists between transducer and loop detector. Since the initially encountered (uninfluenced) frequency of the loop detector is measured, and the degree of increase subsequently induced is known in real time, a display can be provided for the user showing not only that a loop has been detected, but also the degree of influence achieved.
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