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:
Oct. 22, 1996
Filed:
Oct. 22, 1993
Frank Bucholtz, Crofton, MD (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A fiber optic Faraday flux transformer sensor is disclosed which comprises: a closed loop of wire being responsive to a first time-varying magnetic field from a remote source for producing a secondary time-varying magnetic field which varies as a function of the first time-varying magnetic field, and an optical fiber loop having a plurality of turns arranged in a preselected configuration adjacent to the closed loop of wire and adapted to receive and pass therethrough input light having a fixed state of linear polarization. The optical fiber loop is responsive to the secondary time-varying magnetic field and to the input light for producing light having a polarization state which changes as a function of the secondary time-varying magnetic field applied thereto. In a system implentation, an optical source transmits light having a linear state of polarization to a first polarizer, which selects and sends a fixed predetermined state of polarization to the fiber optic Faraday flux transformer sensor. A second polarizer converts the resultant light from the fiber optic Faraday flux transformer sensor into an output light which changes in intensity as a function of the changing polarization state of the resultant light. A photodetector converts this output light into an electrical signal which varies in amplitude as a function of the time-varying magnetic field from the remote source.