Inductive loop presence detector with cross talk filter

Details Inductive loop presence detector with cross talk filter Inductive loop presence detector with cross talk filter

1984-03-13

1989-10-10

Wan, Gene

Oscillators

With device responsive to external physical condition

340941, G08G 107

Patent

active

048734942

ABSTRACT:
An inductive loop presence detector, more especially a vehicle detector, including a loop oscillator having an inductive loop connected as a frequency determining element of the oscillator, which inductive loop may be buried in a roadway to sense the presence of vehicles, and sensing circuitry to detect changes in the loop oscillator frequency due to vehicle movements in the vicinity of the loop, with a filter network inserted between the output of the loop oscillator and the sensing circuitry to improve performance when cross-talk occurs due to mutual interference between a number of inductive loop detectors forming part of a total installation. The filter network can be a phase-locked loop incorporating a low pass filter to attenuate high frequency components due to cross-talk.

REFERENCES:
patent: 4430636 (1984-02-01), Bruce
Linear Integrated Circuit D.A.T.A. Book, Edition 23, D.A.T.A. Inc., San Diego, CA, Jul. 1980, p. 495.

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