Non-destructive testing of critical infrastructure with giant magneto resistive sensors

CATEGORY: REMAINING LIFE PREDICTION
Non-destructive testing of critical infrastructure with giant magneto resistive sensors

Type	Conference Paper
Author	A. Hunze
Author	J. Bailey
URL	http://dx.doi.org/10.1117/12.2217930
Volume	9804
Pages	98041Q-98041Q-10
Date	2016
Abstract	Corrosion is the primary failure mechanism for metallic structures. A standard non-destructive technique to assess the status and predict remaining lifetime 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. Because the magnetic field decays quickly, a large lift-off between the excitation source, magnetic sensors and the test object is used to reduce the signals. To obtain a deep penetration into the test object excitation at low frequency is desirable. Authors report results of a study of a high power excitation system in combination with giant magneto resistance (GMR) based sensors. GMR sensors have a good sensitivity and are suitable for low frequency eddy current testing due to their low 1/f noise. Researchers employed finite element analysis to evaluate the excitation setup, sensor alignment and positions and examine the influence of different parameters of the excitation and sensor setup as well as the device under test.
Proceedings Title	Proc. SPIE 9804, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2016,