Multichannel fiber-optic magnetometer system for undersea measurements

We have designed, fabricated, and operated an undersea array of eight fiber-optic vector magnetometers. Each magnetometer consists of three magnetostrictive transducers aligned on orthogonal axes and incorporated in a single Michelson interferometer. During undersea operation, each interferometer ex...

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Bibliographic Details
Published in:Journal of lightwave technology 1995-07, Vol.13 (7), p.1385-1395
Main Authors: Bucholtz, F., Villarruel, C.A., Davis, A.R., Kirkendall, C.K., Dagenais, D.M., McVicker, J.A., Patrick, S.S., Koo, K.P., Gunnar Wang, Valo, H., Lund, T., Andersen, A.G., Gjessing, R., Eidem, E.J., Knudsen, T.
Format: Article
Language:English
Subjects:
Geomagnetism
Magnetic noise
Magnetic variables measurement
Magnetometers
Magnetostriction
Optical design
Optical interferometry
Optical noise
Phase noise
Transducers
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Summary:We have designed, fabricated, and operated an undersea array of eight fiber-optic vector magnetometers. Each magnetometer consists of three magnetostrictive transducers aligned on orthogonal axes and incorporated in a single Michelson interferometer. During undersea operation, each interferometer exhibited less than 1 /spl mu/rad//spl radic/ Hz phase noise, and the self-noise of each magnetic transducer was less than 0.2 nT//spl radic/ Hz at 0.1 Hz. We discuss the design and performance of the optical system including noise mechanisms. We present the results of magnetic measurements of the geomagnetic field and the magnetic tracking of ships.< >
ISSN:0733-8724
1558-2213
DOI:10.1109/50.400703