Inductive loop detector

Details Inductive loop detector Inductive loop detector

1985-08-27

1987-01-27

LaRoche, Eugene R.

Oscillators

With device responsive to external physical condition

340568, 340941, G01N 2700, G08G 101

Patent

active

046396896

ABSTRACT:
An inductive loop has its frequency of oscillation controlled by means of a counter, a reference frequency source, a comparator, and an attenuator. The frequency of the loop is compared by the comparator to the frequency of the reference source to produce an error signal which controls the attenuator. The amplitude of the output signal of the attenuator is used to adjust the loop frequency to a desired value.

REFERENCES:
patent: 4358749 (1982-11-01), Clark
patent: 4459561 (1984-07-01), Clark et al.

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