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Optical readouts of cantilever bending designed for high magnetic field application

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4 Author(s)
Keplinger, F. ; Inst. of Ind. Electron. & Mater. Sci., Vienna Univ. of Technol., Austria ; Kvasnica, S. ; Hauser, H. ; Grossinger, R.

A single-fiber optical readout of cantilever deflection caused by Lorentz force was investigated. A good agreement of the optical near field model with the measured nonlinear characteristic was found. The ac-excitation mode of the cantilever is preferable, due to the uncontrollable static light reflections in a single-fiber setup. The presented sensor design seems suitable for a measurement range of the magnetic flux density of at least 10 mT to 50T with moderate excitation current amplitudes. Two-fiber setups may reduce the background light and could enable dc excitation but require smaller offset between cantilever and fiber axis.

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Magnetics, IEEE Transactions on  (Volume:39 ,  Issue: 5 )