A compact fiber-optic magnetometer employing an amorphous metal wire transducer

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.<
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