Accession Number : ADD010413

Title :   Optical Fiber Magnetic Field Sensor with Thermal and Acoustic Isolation.

Descriptive Note : Patent,


Personal Author(s) : Giallorenzi,Thomas G

Report Date : 29 Mar 1983

Pagination or Media Count : 6

Abstract : An optical fiber sensor for detecting the presence of magnetic fields. Light carrying optical fibers are arranged in the form of a dual path interferometer wherein the separate paths define sensing and reference arms. The sensing arm is associated with magnetostrictive material for defining a sensing element which in the presence of a magnetic field undergoes dimensional changes to stretch the optical fiber to change its optical path length thus causing a detectable phase shift in light passing therethrough when compared with the the same light passing through the optical fiber of the reference arm. The sensing element is isolated from thermal and acoustic perturbations thus permitting low frequency magnetic field detection.

Descriptors :   *Patents, *Magnetometers, *Interferometers, *Fiber optics, *Magnetostriction, Dual mode, Magnetic fields, Phase shift, Laser beams, Sizes(Dimensions), Magnetic materials, Isolation, Length, Materials, Paths, Thermal properties, Optical detectors, Acoustics, Perturbations, Fiber optics transmission lines, Specifications

Subject Categories : Lasers and Masers
      Test Facilities, Equipment and Methods
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE