Metal detection circuit

Details Metal detection circuit Metal detection circuit

1989-10-11

1991-06-18

Mis, David

Oscillators

With device responsive to external physical condition

331 18, G01N 2700

Patent

active

050252275

ABSTRACT:
Metal detection apparatus comprises an oscillator circuit including an inductive detection coil and a detector for rectifying the output of the oscillator circuit synchronously with the frequency of oscillation. A comparison circuit compares the rectified output of the oscillator circuit with a reference signal and generates an output signal having a value related to the amplitude of the oscillator output. A feedback circuit generates a positive feedback signal and applies it to the oscillator circuit to maintain its oscillation at a predetermined amplitude under quiescent conditions. The circuit is largely immune to electromagnetic interference and temperature sensitive effects.

REFERENCES:
patent: 4639689 (1987-01-01), Bartlett
patent: 4825158 (1989-04-01), Watabe et al.

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