Loop detector for traffic signal control

Details Loop detector for traffic signal control Loop detector for traffic signal control

1981-06-29

1984-02-07

Miller, Stanley D.

Communications: electrical

Vehicle detectors

Inductive

340933, 324236, 331 65, G08G 107

Patent

active

044306369

ABSTRACT:
A circuit used in a traffic control apparatus for detecting changes in the frequency of an oscillator which has an inductive loop-sensor as a resonating element. The circuit comprises a phase-locked loop oscillator with restricted tuning range and a high impedance amplifier followed by threshold detectors adjusted to sense the entry and exit of a vehicle over the area covered by the loop-sensor. The high-resolution of the circuit overcomes long-term drift problems inherent to loop-sensor detectors with analog circuitry.

REFERENCES:
patent: 3474409 (1969-10-01), Gottlieb
patent: 3599145 (1971-08-01), Ando et al.
Ogren, V. G., "Sensor Circuit Utilizing Variable Inductance Input", IBM Technical Disclosure Bulletin, vol. 14, No. 4, p. 1225, Sep. 71.

Affiliated with

Also associated with

Rating

Loop detector for traffic signal control does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Loop detector for traffic signal control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Loop detector for traffic signal control will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2163891