Fiber Optic Magnetic Field Sensor.
Abstract
An optical fiber magnetometer uses a birefringment optical fiber in combination with a magnetostrictive block for inducing strains in the fiber in response to an applied magnetic field to thereby cause a change in the degree of briefringence of the fiber. This change in birefringence is measured by directing the light exiting the fiber through a conversion element such as a polarizer or a prism and then detecting the resulting intensity modulation in a photodetector. A variety of inventive features are set out in this disclosure, including the use of spliced fibers with a 90 degree axis rotation to compensate for environmental effects, the use of twisted fiber for gradient field sensing, and the rotation of the sensor fiber to eliminate low-frequency noise and to obtain a vector field and field gradient sensing capability.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 09, 1982
- Accession Number
- ADD009810
Entities
People
- Henry F. Taylor
Organizations
- United States Department of the Navy