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. 11, 1984
Filed:
Mar. 08, 1982
Thomas G Giallorenzi, Springfield, VA (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A magnetic field sensor for detecting a magnetic field perturbation while nulling out variations in the signal caused by acoustic perturbations comprising a first and second optical fibers, an adjustable optical coupler for coupling light therebetween, a magnetic component attached to the optical coupler for exerting a mechanical force thereon proportional to a magnetic field perturbation to thereby change the degree of coupling between the fibers, and an optical detector for determining the amount of light actually being coupled between the fibers. As noted above, the system includes an acoustic circuit for nulling out the response in the detector signal due to acoustic perturbations. Two separate embodiments are disclosed. A first embodiment modulates the axial alignment of fibers in an end-to-end configuration by means of a magnetic material. A second embodiment modulates the evanescent coupling between the fibers disposed in parallel adjacency via a magnetostrictive material.