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HTS SQUIDs for the nondestructive evaluation of composite structures

Carr, Chris and Graham, David and MacFarlane, John C. and Donaldson, Gordon B. (2003) HTS SQUIDs for the nondestructive evaluation of composite structures. Superconductor Science and Technology, 16 (12). pp. 1387-1390. ISSN 0953-2048

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Abstract

While LTS and HTS SQUIDs have successfully been applied in the detection of flaws in aircraft grade aluminium structures for well over a decade, interest has recently spread to a type of new material, namely composites. One example, carbon fibre reinforced polymer (CFRP), is increasingly being favoured by the aircraft industry because of its strength to weight ratio and the fact that it is corrosion-resistant. Material and defect characterization using SQUIDs is still at an early stage, but due to expected rapid expansion in the use of such materials, there is ample scope for the application of HTS SQUIDs. Here we have applied HTS SQUID single-layer gradiometers to investigate artificially created defects in CFRP samples.