A Superconducting QUantum Interference Device magnetometer system
for quantitative analysis and imaging of hidden corrosion activity
in aircraft aluminum structures
Abedi A; Fellenstein JJ; Lucas AJ; Wikswo JP
Review of Scientific Instruments, Vol 70 (12), pp 4640-4651
We have designed and built a magnetic imaging system for quantitative analysis of the rate of ongoing hidden corrosion of aircraft aluminum alloys in planar structures such as intact aircraft lap joints. The system utilizes a superconducting quantum interference device (SQUID) magnetometer that measures the magnetic field associated with corrosion currents. It consists of a three-axis (vector) SQUID differential magnetometer, magnetic, and rf shielding, a computer controlled x-y stage, sample registration, and positioning mechanisms, and data acquisition and analysis software. The system is capable of scanning planar samples with dimensions of up to 28 cm square, with a spatial resolution of 2 mm, and a sensitivity of 0.3 pT/Hz1/2 (at 10 Hz). In this article we report the design and technical issues related to this system, outline important data acquisition techniques and criteria for accurate measurements of the rate of corrosion, especially for weakly corroding samples, and present preliminary measurements. © 1999 American Institute of Physics.
Reprinted with permission from Abedi, A.; Fellenstein, J.J.; Lucas, A.J.; Wikswo, J.P.,Jr. "A Superconducting Quantum Interference Device Magnetometer system for Quantitative Analysis and Imaging of Hidden Corrosion Activity in Aircraft Aluminum Structures"Review of Scientific Insturments, Vol.70(12) 1999 pp 4640-4651 (c) 1999 American Institute of Physics This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics
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