Title :
A compact fiber-optic magnetometer employing an amorphous metal wire transducer
Author :
Koo, K.P. ; Bucholtz, F. ; Dagenais, D.M. ; Dandridge, A.
Author_Institution :
SFA Inc., Landover, MD, USA
Abstract :
A compact fiber-optic magnetometer constructed using a short piece of amorphous metal wire (5-cm long*100- mu m diameter) as the magnetostrictive transducer is discussed. The inherently large ratio of length to cross-sectional area results in a low demagnetization along the axial direction. A magnetostrictive constant of 5*10/sup -5//Oe/sup 2/, which is 10-50 times larger than the reported values for transducers made from Metglas ribbons, was measured. Minimum detectable magnetic fields on the order of 10/sup -5/ Oe/Hz/sup 1/2/ at 1 Hz were achieved using a 5-cm-long sensing fiber.<>
Keywords :
demagnetisation; fibre optic sensors; magnetic field measurement; magneto-optical devices; magnetometers; magnetostrictive devices; metallic glasses; 100 micron; 5 cm; 500 Hz to 15 kHz; Fe/sub 77.5/Bi/sub 15/Si/sub 7.5/; Metglas ribbons; amorphous metal wire transducer; compact fiber-optic magnetometer; low demagnetization; magnetostrictive constant; magnetostrictive transducer; metallic glass; minimum detectable magnetic fields; sensing fiber; transducers; Amorphous magnetic materials; Amorphous materials; Magnetic anisotropy; Magnetic field measurement; Magnetometers; Magnetostriction; Optical fiber sensors; Perpendicular magnetic anisotropy; Transducers; Wire;
Journal_Title :
Photonics Technology Letters, IEEE
