Recent developments in fiber optic magnetostrictive sensors

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Abstract
We review developments over the past five years in fiber optic magnetometry based on magnetostriction. Recent work has demonstrated detection of magnetic fields from dc to over 1 MHz with resolution of 10 pT P1Hz at 1 .0 Hz and 0.07 pTpIHz at35 kHz in laboratory devices. We present the basic device operating principles and discuss factors which limit the resolution of fiber optic interferometric magnetic sensors. Results are presented for a number of configurations including a ruggedized, compact, three-axis magnetometer for dc and low-frequency measurements, a single-axis gradiometer, a single-axis heterodyne configuration for narrowband detection of fields in the frequency range 0.01 Hz to 1 MHz, and a magnetostrictive oscillator which exhibits period doubling bifurcations and chaos.

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