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31 March 1998 Low-frequency magnetoresistive eddy-current sensors for NDE of aging aircraft
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Life extensions on numerous military and commercial aircraft have heightened the need for quantitative, nondestructive detection of deeply buried damage in aircraft structures. Traditional coil-based eddy-current sensors are severely limited in their ability to detect small buried defects, defects under fasteners and deeply buried cracks and corrosion. TPL has developed eddy-current sensors based on the use of Giant Magnetoresistance (GMR) sensor elements. GMR offers high sensitivity, very wide bandwidth and low noise from DC to over 1 GHz. Coupled with the ability to fabricate GMR sensors with micron-level dimensions, these new eddy-current sensors offer an ideal technology for inspections requiring high spatial resolution and low- frequency, deeply-penetrating fields. This paper discusses magnetoresistance and results obtained using a prototype GMR sensor for both contacting and non-contacting, C-Scan measurements on samples containing crack and corrosion damage.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Eric S. Boltz, D. W. Cutler, and Timothy C. Tiernan "Low-frequency magnetoresistive eddy-current sensors for NDE of aging aircraft", Proc. SPIE 3397, Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware II, (31 March 1998);

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