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, 2004
Filed:
Feb. 14, 2002
Petru Ciureanu, Saint-Laurent, Québec, CA;
Piotr Rudkowski, Dollard-des-Ormeaux, Québec, CA;
Arthur Yelon, Westmount, Québec, CA;
Other;
Abstract
A high sensitivity magnetic field sensor is described. The sensing element is a stress-sensitive, negative-magnetostriction, melt-extracted amorphous wire, in which a strong magneto-impendance effect develops when the wire is connected to conventional electronic circuitry, which can be an impedance-meter. An a.c. current is provided to the wire and its relative change in impedance is measured. Simultaneously, the wire is submitted to a longitudinal d.c. magnetic field, H. A saturating d.c. field pulse is also applied to this wire at the beginning of the operating cycle. Tensile stress is further generated in the wire by pulling one end of the wire with a given force. This stress can be fine-tuned for sensitivity and bias with the help of a suitable mechanism. All these elements are packaged in a rugged non-magnetic enclosure, which permits easy and reliable connection of the sensor to said conventional electronic circuitry.