Accession Number : ADD011115

Title :   Fiber Optic Sensor with Enhanced Immunity to Random Environmental Perturbations.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Rashleigh,S C

Report Date : 10 Apr 1984

Pagination or Media Count : 13

Abstract : A sensor is provided for sensing or detecting the presence of an environmental field condition such as acceleration, temperature change, magnetic or acoustic fields. The field is sensed by interference between two mutually orthogonal polarized eigenmodes in a single monomode optical fiber which may be disposed either linearly or wound on a mandrel made of compliant material for sensing an acoustic field, or made of magnetostrictive material for sensing a magnetic field. Polarized light propagated through the optical fiber is detected at its outlet independent of environmentally induced low frequency variations whereby the sensor may be maintained at quadrature and maximum sensitivity. (Author)

Descriptors :   *Patents, *Fiber optics, *Change detection, *Optical detectors, *Optical interferometers, Phase shift, Accelerometers, Temperature, Birefringence, Magnetometers, Acoustooptics, Acoustic detection, Orthogonality, Materials, Acceleration, Elastic properties, Environments, Magnetic fields, Detectors, Magnetostriction, Eigenvalues, Polarization, Acoustic fields, Distortion

Subject Categories : Test Facilities, Equipment and Methods
      Acoustic Detection and Detectors
      Optical Detection and Detectors
      Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE