Single-core fluxgate gradiometer with simultaneous gradient and homogeneous feedback operation
Typ dokumentučlánek z elektronického periodika
Práva© 2012 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
The following article appeared in M. Janosek et al., J. Appl. Phys. 111, 07E328 (2012) and may be found at <a href="http://link.aip.org/link/?jap/111/07E328">M. Janosek et al., J. Appl. Phys. Lett. 111, 07E328 (2012)</A>.
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A novel configuration of a single-core gradiometer, utilizing both homogeneous and gradient feedback operation, is presented. The fluxgate gradiometer comprises of a standard pick-up/ feedback coil and an additional gradient pickup/feedback coil with two separate electronic blocks. The 40-mm-long gradient coil is concentric and coaxial with the homogeneous pickup/feedback coil: the gradient coil assembly was slipped over an already existing race-track fluxgate sensor. The gradient coil works as a pick-up coil and it also generates the compensating field which well approximates a first-order gradient field with zero spatial-mean value. Together with the compensating field from the homogeneous feedback coil, it is thus always possible to measure in two independent feedback loops the homogeneous and gradient field components. The 1/f gradient noise is 4 nT/m/√Hz @ 1 Hz, and it can be further improved by separating the gradient feedback and compensating coil.
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