The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 24, 2008
Filed:
Aug. 29, 2006
Michael H. Linse, Corvallis, OR (US);
Phillip R. Hays, Corvallis, OR (US);
Gary J. Oliver, Corvallis, OR (US);
Thomas V. Scrivner, Sweet Home, OR (US);
Jimmy Jack Jewell, Sweet Home, OR (US);
Michael H. Linse, Corvallis, OR (US);
Phillip R. Hays, Corvallis, OR (US);
Gary J. Oliver, Corvallis, OR (US);
Thomas V. Scrivner, Sweet Home, OR (US);
Jimmy Jack Jewell, Sweet Home, OR (US);
White's Electronics, Inc., Sweet Home, OR (US);
Abstract
Metal detectors include a sense coil coupled to an analog to digital converter that produces a numeric representation of an electrical signal associated with a conductive object situated in an active region of a sense coil. The numeric representation is processed to obtain a noise contribution associated with random noise, fixed pattern noise, and/or thermal drift. The noise is subtracted from the numeric representation to produce a numeric difference. The numeric difference includes contributions associated with conductive objects located in a sense volume defined by the sense coil. The numeric difference (or the numeric representation) can be digitally processed with, for example, a matched filter to enhance the conductive object contribution. The matched filter can be based on a measured sense coil speed or can be based on typical sense coil speeds.