22 April 2016 Non-destructive testing of critical infrastructure with giant magneto resistive sensors
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Abstract
Corrosion is the leading failure mechanism for metallic structures. One of the standard non-destructive techniques to assess the status and predict remaining lifetime and possible failure is based on the excitation with a varying magnetic field and measuring the change of the magnetic field due to eddy currents in the device under test. Since the magnetic field is decaying quickly a large lift-off between the excitation source, magnetic sensors and the test object will reduce the signals considerably. In order to obtain a deep penetration into the test object excitation at low frequency is desirable. In this study an investigation of a high power excitation system in combination with giant magneto resistance (GMR) based sensors was done. GMR sensors have a good sensitivity and are suitable for low frequency eddy current testing due to their low 1/f noise. Finite element analysis was used to evaluate the excitation setup, sensor alignment and positions and study the influence of different parameters of the excitation and sensor setup as well as the device under test. Based on these results a laboratory setup was build and used to study the influence of main measurement parameters.
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A. Hunze, A. Hunze, J. Bailey, J. Bailey, G. Sidorov, G. Sidorov, P. Bondurant, P. Bondurant, T. Mactutis, T. Mactutis, "Non-destructive testing of critical infrastructure with giant magneto resistive sensors", Proc. SPIE 9804, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2016, 98041Q (22 April 2016); doi: 10.1117/12.2217930; https://doi.org/10.1117/12.2217930
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