Unshielded use of thin-film Nb dc superconducting quantum interference devices and integrated asymmetric gradiometers for nondestructive evaluation

Walker, M.E., Nakane, H., Cochran, A. , Weston, R.G., Klein, U., Pegrum, C.M. and Donaldson, G.B. (1997) Unshielded use of thin-film Nb dc superconducting quantum interference devices and integrated asymmetric gradiometers for nondestructive evaluation. Applied Physics Letters, 71(1), pp. 131-133. (doi:10.1063/1.119450)

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Abstract

Novel nondestructive evaluation measurements made using niobium dc superconducting quantum interference devices with integrated asymmetric first-order gradiometers are described. Comparative theoretical and experimental studies of their spatial response have been described, and it is shown that the gradiometric response makes operation possible in an unshielded and electromagnetically noisy environment. As a demonstration of their capabilities, subsurface defects in a multilayer aluminum structure have been located and mapped using induced eddy currents at 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: Walker, M.E., Nakane, H., Cochran, A., Weston, R.G., Klein, U., Pegrum, C.M., and Donaldson, G.B.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Applied Physics Letters
Publisher:AIP Publishing
ISSN:0003-6951
ISSN (Online):1077-3118
Published Online:01 June 1998

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