Fiber-optic magnetic gradiometer utilizing the magnetic translational force

Author

Okamura, Haruo

Author_Institution

NTT Transmission Syst. Lab., Kanagawa, Japan

Volume

8

Issue

6

fYear

1990

fDate

6/1/1990 12:00:00 AM

Firstpage

877

Lastpage

882

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;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.54504

Filename

54504