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Electromagnetic microscope for deep pulsed eddy current evaluation of airframes

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.