Large scale metallic object detector
AssigneeEastman Kodak Company
InventorsFrederick John Jeffers, Tomasz Marek Jagielinski
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Abstract
Apparatus for detecting a magnetizable or conductive object which passes through a magnetic detecting field. The apparatus includes first and second spaced coils for producing a magnetic field between the spaced coils; first and second magnetic field detectors respectively located within the coils with their sensitive axes parallel to the direction of passage of a magnetizable object between the spaced coils and perpendicular to the primary field of the coils; and electrical circuitry coupled to the first and second magnetic field detectors for producing a detection signal in which common mode field noise and thermally induced noise is substantially eliminated.
Claims5
Apparatus for detecting a magnetizable object comprising:
- first and second spaced coils for producing a magnetic field between said spaced coils;
- first and second magnetic field detectors respectively located within said coils with their sensitive axes parallel to the direction of passage of a magnetizable object between said spaced coils and perpendicular to the field of said coils;
- and
- electrical circuitry coupled to said first and second magnetic field detectors for producing a detection signal in which common mode field noise and thermally induced noise is substantially eliminated.
Dependencies are inferred from the claim text.