COMPARISON OF SPIN VALVE AND MAGNETIC TUNNEL JUNCTION MAGNETO RESISTIVE SENSORS IN EDDY CURRENT TESTING PROBES

Luis S. Rosado, Filipe A. Cardoso, Susana Cardoso, Telmo G. Santos, Pedro M. Ramos, Paulo P. Freitas, Moisés Piedade

Abstract

This paper compares two different magneto resistive sensor technologies used on the same configuration of eddy current testing probe. Two dimensional testing results on a friction stir welding aluminum joint were used to compare spin valve and magnetic tunnel junction sensors. These results showed that, magnetic tunnel junction sensors, provided a significant improvement on the signal to noise ratio and signal amplitude over spin valves.

Keywords

eddy currents testing, differential, magneto-resistive, spin valve, magnetic tunnel junction

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IMEKO-WC-2015-TC4-141.pdf

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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