Metal detector

Details Metal detector Metal detector

1983-08-29

1985-07-23

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

56 102, G08B 2100

Patent

active

045311188

ABSTRACT:
A monitoring circuit is provided for a metal detector which includes a metal sensor for producing a sensor signal in response to the passage of a metallic object through a rotating apparatus and a tachometer for producing a tachometer signal at a frequency proportional to the rate of rotation of the rotating apparatus. In accordance with the invention, the monitoring circuit comprises an adjustable tracking filter responsive to a predetermined control signal for tracking the frequency of the sensor signal in a predetermined fashion and a control circuit responsive to the tachometer signal for producing the control signal.

REFERENCES:
patent: 3757501 (1973-09-01), Bennett, Jr. et al.
patent: 3758849 (1973-09-01), Susman et al.
patent: 3763424 (1973-10-01), Bennett, Jr. et al.
patent: 3805497 (1974-04-01), Ross
patent: 3889249 (1975-06-01), Bennett, Jr. et al.
patent: 3896608 (1975-07-01), Garrott
patent: 3959953 (1976-06-01), Garrott
patent: 3964042 (1976-06-01), Garrott
patent: 3972156 (1976-08-01), Bennett, Jr. et al.
patent: 4193248 (1980-03-01), Gilleman

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