Title :
Fiber-optic magnetic gradiometer utilizing the magnetic translational force
Author_Institution :
NTT Transmission Syst. Lab., Kanagawa, Japan
fDate :
6/1/1990 12:00:00 AM
Abstract :
A fiberoptic AC/DC magnetic gradiometer utilizing magnetic translational force is proposed, and its working principle is verified. The minimum gradient of an AC magnetic field of 4×10-2 is detected with 100 mm of Sm-Co-coated sensor fiber built into an interferometer. This gradiometer is intrinsically insensitive to spatially uniform magnetic fields but is sensitive to their gradients. Therefore, the dynamic range and S/N ratio of measurements with the proposed sensor are not restricted by the magnitude of background magnetic field, including the geologic magnetic field. Spatial resolution is <1 mm
Keywords :
coatings; cobalt; fibre optic sensors; light interferometers; magnetometers; samarium; AC magnetic field; S/N ratio; Sm-Co coating; background magnetic field; dynamic range; fiberoptic AC/DC magnetic gradiometer; geologic magnetic field; interferometer; magnetic translational force; spatially uniform magnetic fields; Coatings; Force sensors; Magnetic fields; Magnetic heads; Magnetic sensors; Magnetostriction; Optical fiber sensors; Optical fiber theory; Optical fibers; Solenoids;
Journal_Title :
Lightwave Technology, Journal of
