Ferromagnetic object detector with comparison of signal maximums

Details Ferromagnetic object detector with comparison of signal maximums Ferromagnetic object detector with comparison of signal maximums

1989-12-13

1991-03-19

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

209549, 324243, 324260, 340568, G01R 3312, G01N 2772, G08B 2100

Patent

active

050014250

ABSTRACT:
A device for detecting the passage of a ferromagnetic object through a predetermined space has a substantially circular base which circumscribes the space. An inner detector coil and an outer detector coil are concentrically mounted in coplanarity on the base. Voltages are induced on the coils in response to the passage of a nearby magnetic field, such as the small permanent magnetic field associated with a ferromagnetic object. A signal processing circuit compares the induced voltages on the coils to indicate passage of a metal object through the circumscribed space when the inner coil voltage exceeds the outer coil voltage.

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