Low-frequency magnetoresistive eddy-current sensors for NDE of aging aircraft

Eric S. Boltz; D. W. Cutler; Timothy C. Tiernan

doi:10.1117/12.305064

31 March 1998 Low-frequency magnetoresistive eddy-current sensors for NDE of aging aircraft

Eric S. Boltz, D. W. Cutler, Timothy C. Tiernan

Proceedings Volume 3397, Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware II; (1998) https://doi.org/10.1117/12.305064
Event: Non-Destructive Evaluation Techniques for Aging Infrastructure and Manufacturing, 1998, San Antonio, TX, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.305064

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