Vehicle presence loop detector

Details Vehicle presence loop detector Vehicle presence loop detector

1981-11-30

1984-09-18

Groody, James J.

Communications: electrical

Vehicle detectors

Inductive

324233, 340 51, 340568, 340939, G08C 101

Patent

active

044727062

ABSTRACT:
A vehicle presence detection system capable of detecting multiple entry and exiting comprising an electrical signal generating system comprising a tuned circuit having a magnetic field-producing induction loop for receiving a vehicle in proximity thereto to change the field configuration and corresponding signal resulting therefrom. Signals generated by said loop result from changes in the field of said loop and occur as a result of the entrance or exiting of a vehicle into or away from the proximity of the loop. A first or signal amplifier is used for amplification of the signal received from said loop. A second amplifier responds to positive or negative polarity input from said first amplifier to provide an output in response to a rapidly changing input which will activate a logic gate for sensing the polarity of said second amplifier output signal and producing a gated output signal.

REFERENCES:
patent: 3571789 (1971-03-01), Midlock
patent: 3868626 (1975-02-01), Masher
patent: 3911389 (1975-10-01), Mills
patent: 4075563 (1978-02-01), Battle
patent: 4296401 (1981-10-01), Duley

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