Ferromagnetic object detector with comparison of signal maximums from a pair of detection coils
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United States of America Patent
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Mar 19, 1991
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N/A
app pub date -
Dec 13, 1989
filing date -
Dec 13, 1989
priority date (Note) -
Expired
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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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