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The Use of Squids for Nondestructive Evaluation

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SQUID Sensors: Fundamentals, Fabrication and Applications

Part of the book series: NATO ASI Series ((NSSE,volume 329))

Abstract

We open with an account of early work on SQUID NDE, describing remote magnetometry and galvanometry, and the inverse problem. Then we concentrate on our own progress in mapping the magnetic fields produced by eddy-currents as flaws in conducting structures distort their flow. The Finite Element Method, the Volume Integral Method and other approaches to the problem of deducing flaw locations are reviewed. Next we turn to developments with high-Tc SQUID systems, concentrating on ‘electronic gradiometers’ where the outputs of more than one SQUID are differenced to eliminate common mode fields. Flaws breaking test piece surfaces both near-side to the detector and far-side have been imaged. Moreover they have been detected also in the lower layers of multi-sheet specimens.

Flaw detection in aircraft and pressure-vessel structures are discussed, and we end by looking at the prospects for bringing the technology into widespread use.

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Author information

Authors and Affiliations

  1. Department of Physics and Applied Physics, University of Strathclyde, Glasgow, G4 0NG, Scotland

    G. B. Donaldson, A. Cochran & D. McA. McKirdy

Authors
  1. G. B. Donaldson
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  2. A. Cochran
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  3. D. McA. McKirdy
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Editors and Affiliations

  1. Air Force Office of Scientific Research, Washington, DC, USA

    Harold Weinstock

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Donaldson, G.B., Cochran, A., McKirdy, D.M. (1996). The Use of Squids for Nondestructive Evaluation. In: Weinstock, H. (eds) SQUID Sensors: Fundamentals, Fabrication and Applications. NATO ASI Series, vol 329. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5674-5_15

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  • DOI: https://doi.org/10.1007/978-94-011-5674-5_15

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