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14 November 1996 Electromagnetic microscope for deep pulsed eddy current evaluation of airframes
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Superconductive quantum interference devices, patterned in copper oxide superconductor, offer new technology for eddy current evaluation of airframes, using pulsed currents. Their high sensitivity at low frequencies, with minute pickup loops, enables arrays that can give scanned images of millimeter fatigue cracks and corrosion hidden in underlayers of airframes, without disassembly. High temperature superconductors can bring the arrays into common use. They enable packaging them in a hand-held, refrigerated instrument without cryogenic encumbrances. The instrument would be a hand-held, electromagnetic microscope for eddy current inspection of airframes.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Walter N. Podney "Electromagnetic microscope for deep pulsed eddy current evaluation of airframes", Proc. SPIE 2945, Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware, (14 November 1996);

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