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:
Apr. 27, 2021
Filed:
Jan. 31, 2019
Mettler-toledo Safeline Ltd., Manchester, GB;
Yang Tao, Manchester, GB;
Christos Ktistis, Warrington, GB;
Mettler-Toledo Safeline Ltd., Manchester, GB;
Abstract
A metal detector () has a drive coil (L) and at least one detection coil (L, L) that detect fluctuations in a magnetic field generated by the drive coil, caused by metallic particles present in an inspected object. A multi-frequency transmitter unit () has a converter () with a plurality of drive switches (S, S; S, S) driven by a drive controller (). The drive switches alternately conduct a drive current through the drive coil to generate an electromagnetic field with two or more different frequency components. A waveform of the drive current is determined, as is at least one pulse-modulated (PXM) signal corresponding to the determined waveform. The determined PXM-signal is determined online or is stored in a memory module (). The determined PXM-signal is generated and applied to control the drive switches. The drive current can be applied to the drive coil through an admittance unit ().