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NDT on Aluminum Aircraft Plates based on Eddy Current Sensing and Image Processing

Postolache, O. ; Dias Pereira, J. M. ; Ramos, H. ; Ribeiro, A. L.

NDT on Aluminum Aircraft Plates based on Eddy Current Sensing and Image Processing, Proc IEEE International Instrumentation and Technology Conf. - I2MTC, Victoria, Canada, Vol. I, pp. 1803 - 1808, May, 2008.

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Abstract
Non-Destructive Testing (NDT) applied to aluminum
aircraft plates refers to testing the plates without impairing its worth
or functional properties. In the work a NDT system architecture
based on the use of fully inductive probes with excitation and
sensing coils and hybrid probe with an excitation coil and a
magneto-resistance as sensing element is presented. Appropriate
signal conditioning and signal acquisition modules are included in
the system. Using an X-Y plotter the probe is moved over the
aluminum plate under test and a set of eddy current images is
obtained. Image conversions, image filtering, image segmentation
with feature extraction and geometrical characteristics of the
detected cracks determines the capability of the designed and
implemented software for non destructive testing. A practical
approach concerning the optimal filtering of the image for a better
segmentation and feature extraction was included in the paper.
Several results concerning the aluminum plate crack detection and
geometrical characterization are included.