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:
Sep. 06, 1988
Filed:
Mar. 03, 1986
Marc D Mermelstein, Chevy Chase, MD (US);
Geo-Centers, Inc., Newton Centre, MA (US);
Abstract
A highly sensitive magnetometer employs a magnetostrictive amorphous metal core in which a piezoelectric driver induces stress variations. In the presence of an external magnetic field, the magnetization of the magnetostrictive core varies in relation to the induced stress. The amplitude of the variations in magnetization is proportional to the strength of the external field and is sensed by a pick-up winding disposed around the magnetostrictive core. The dynamic range of the device is improved by employing a bucking field winding around the core to null out the magnetization of the core. In contrast to the inherent non-linear characteristic of the conventional fluxgate magnetometer, the invention inherently provides a linear response to magnetic field strength.