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:
Jan. 17, 2012
Filed:
Dec. 17, 2008
Sergey A. Moskalenko, Maple Grove, MN (US);
Sergey A. Moskalenko, Maple Grove, MN (US);
Thermo Fisher Scientific, Coon Rapids, MN (US);
Abstract
A metal detector () used for identifying contaminants in products () introduced into the metal detector by a conveyor. The detector () includes coils (), a search head () and an analog to digital converter () that generates a reactive signal () in response to the presence of a contaminant in the region of the coils. A calculation processor () receives the reactive signal () along with the value of the conveyor speed () to determine a calibration ratio R that is unique to each individual metal detector (). The optimum frequency F for metal detector operation is equal to the conveyor speed () divided by the ratio R. The ratio R simplifies the selection of filter parameters () for a speed filter () which correlates the conveyor speed () with the frequency F so as to deliver an optimized signal to the detection algorithm () used to determine the presence of a contaminant based on the signal () derived from the coils ().