Integrated low-temperature superconductor SQUID gradiometers for nondestructive evaluation

Klein, U., Walker, M.E., Carr, C., McKirdy, D.M., Pegrum, C.M., Donaldson, G.B., Cochran, A. and Nakane, H. (1997) Integrated low-temperature superconductor SQUID gradiometers for nondestructive evaluation. IEEE Transactions on Applied Superconductivity, 7(2), pp. 3037-3039. (doi:10.1109/77.621972)

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Abstract

We describe an eddy current nondestructive evaluation system using a low-temperature superconductor magnetic field sensor in an electromagnetically unshielded environment. The sensor comprises a niobium dc superconducting quantum interference device (SQUID) integrated with a first-order gradiometric pickup coil to reject spatially uniform interference fields but remain sensitive to flaw induced fields. We demonstrate its use in locating and mapping subsurface flaws in a multilayered aluminum structure using an eddy current excitation field at a frequency of 70 Hz, with no magnetic shielding around the specimen or cryostat.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cochran, Professor Alexander
Authors: Klein, U., Walker, M.E., Carr, C., McKirdy, D.M., Pegrum, C.M., Donaldson, G.B., Cochran, A., and Nakane, H.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:IEEE Transactions on Applied Superconductivity
Publisher:IEEE
ISSN:1051-8223
ISSN (Online):1558-2515

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