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Single-mode fibre-optic magnetometer with DC bias field stabilization

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3 Author(s)
Kersey, A. ; Naval Research Laboratory, Washington, DC, USA ; Jackson, D.A. ; Corke, M.

A sensitive dc field magnetometer, based on magnetostrictive straining of optical fibers is demonstrated, which utilizes active bias field stabilization to ensure that the magnetostrictive sensing element is maintained in a state of zero magnetization. This technique eliminates any problems arising due to magnetic hysteresis effects of the magnetostrictive material which affect the magnetometer output when operated in a conventional 'open-loop' mode. Detection sensitivities of the order of 8 \times 10^{-5} A . m-1( \sim10^{-16} Oe), and a linear dynamic range of 105are demonstrated.

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Lightwave Technology, Journal of  (Volume:3 ,  Issue: 4 )