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[10s, 2004] 

Journal of Electrical Engineering, Vol 55, 10s (2004) 73-76

INVESTIGATION IN DETECTION OF FATIGUE CRACKS UNDER RIVET HEAD AIRFRAME USING IMPROVED GMR MAGNETOMETER IN AN EDDY CURRENT SYSTEM

L. Perez – J. Le Hir – C. Dolabdjian – L. Butin

   We have designed and built a magnetic imaging system associated with eddy current technique for quantitative analysis of the fatigue cracks under rivet of air craft aluminum alloys in planar structures. Sensor utilizes Improved Giant MagnetoResistance Magnetometer (IGMRM) which measures the magnetic field mainly induced by eddy currents distribution. It consists on a mono-axis IGMRM, coil inductors, computer controlled x-y-z stage, data acquisition and analysis software. The laboratory setup can scan planar samples with dimensions of up to 30 cm×5 cm×5 cm, with an optimal spatial resolution and repeatability of around 1 μm, a magnetic field sensitivity of (5/√f) nT/√Hz and a dynamic of (127+10 Log(f)) dB/√Hz (where f is here the induced current frequency), which, respectively, saturate to an optimal value of around 50 pT/√Hz and 166 dB/√Hz. In this article, we report the design and technical issues related to the inspection system, and outline preliminary results in detection of fatigue cracks under rivet head airframe.

Keywords: GMR, magnetometer, low noise, eddy current


[full-paper]


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