On gradiometer imbalance

S.A. Uzunbajakau, A.P. Rijpma, H.J.M. Brake, ter, M.J. Peters

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    Abstract

    We present methods to compute the imbalance in a gradiometer of arbitrary shape due to imperfections in its geometry, eddy currents induced in the radio-frequency interference shield, and screening currents induced in the modules of the superconducting quantum interference devices (SQUIDs). As an example, the methods are applied to evaluate the maximum expected initial imbalance of second- and third-order axial gradiometers in a measuring setup designed for fetal magnetocardiography. Mechanical imperfections in this specific setup appear to have the largest effect: the field imbalance is 2middot10/sup -2/; the first-order gradient imbalance is 10/sup -3/ m; the second-order gradient imbalance is 10/sup -4/ m/sup 2/. In the example, the imbalance caused by the other effects is one order smaller
    Original languageEnglish
    Pages (from-to)1898-1907
    JournalIEEE Transactions on Applied Superconductivity
    Volume16
    Issue number3
    DOIs
    Publication statusPublished - 2006

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    Uzunbajakau, S. A., Rijpma, A. P., Brake, ter, H. J. M., & Peters, M. J. (2006). On gradiometer imbalance. IEEE Transactions on Applied Superconductivity, 16(3), 1898-1907. https://doi.org/10.1109/TASC.2006.873993