Accession Number : ADD018353

Title :   Fiber Optic Faraday Flux Transformer Sensor and System.

Descriptive Note : Patent, Filed 22 Oct 93, patented 22 Oct 96,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Bucholtz, Frank

Report Date : 22 Oct 1996

Pagination or Media Count : 10

Abstract : A fiber optic Faraday flux transformer sensor is disclosed which comprises: (1) 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 (2) 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 implementation, 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.

Descriptors :   *FIBER OPTICS, *MAGNETIC FIELDS, *PATENTS, SIGNAL PROCESSING, LIGHT TRANSMISSION, LINEAR POLARIZATION, PHOTODETECTORS, FARADAY EFFECT, CLOSED LOOP SYSTEMS, CAPACITANCE, TRANSFORMERS, MAGNETORESISTANCE, MAGNET COILS, POLARIZERS

Subject Categories : Electricity and Magnetism
      Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE