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. 24, 2013
Filed:
Feb. 20, 2009
John Haywood, East Gosford, AU;
John Haywood, East Gosford, AU;
Smart Digital Optics Pty Limited, Eveleigh, New South Wales, AU;
Abstract
A sensing coil for a Sagnac interferometer current sensor is disclosed, the sensing coil () being composed of an optical fiber (for example a spun polarizing Hi-Bi fiber) that is arranged in use to transmit a single elliptical polarization state and the sensing coil comprising at least two interconnected loops (andorandorand). At least one of the loops is arranged in use to enclose a current conductor (or) and the loops are interconnected such that light propagating in a first direction (or) in the first loop will propagate in a second, opposite, direction (or) in the other or, if more than one, in each other loop, whereby the sensing coil provides minimal sensitivity to rotational movement. Also disclosed are a sensing unit (FIG.) that incorporates the sensing coil and a current sensor (FIG.) that incorporates the sensing unit.