Abstract

Because of their unparallelled sensitivity, bandwidth, and spatial resolution, Superconducting Quantum Interference Device (SQUID) magnetometers are unequalled in their ability to image the temporal and spatial variation of weak, low frequency magnetic field. For eddy current NDE, SQUIDs can be used with a low frequency excitation current to image cracks or material loss deep in aluminum structures. To detect the subsurface cracks adjacent to a fastener in multilayer aircraft structures, SQUID NDE measurements have utilized a sheet inducer [1] combined with depthselective techniques [2, 3], a gridiron coil inducer combined with pulsed eddy current techniques [4], and a double-D inducer [5].

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