The inspected specimen is a plate of 1.27 mm thickness, in aluminium, conductivity of 18 MS.m-1 and relative permeability of 1.
Plate modeled in CIVA
The probe is made out of a cylindrical coil at double function which geometrical properties are gathered on the figure below that shows the panel in CIVA allowing the definition of those properties. The acquisition is done at 100 kHz, with 100 mA in injection and reception in absolute mode.
Geometrical properties of the probe
The specimen has a non-through elliptical defect emerging on surface, as drawn on figure below.
High and thickness of the elliptical defect present in the flat piece to inspect
The experimental measurements have been realized with an impedancemeter, it has also not been necessary to calibrate the results before the comparison.
Experimental C-scans (top) and obtained with CIVA (bottom) of real part (left) and imaginary part (right)
Amplitude/phase curves comparisons (top), real/imaginary (bottom), horizontal (left) and vertical (right) cuts.
Lissajous curves in impedance plane, horizontal cut (left) and vertical cut (right)
Maximal amplitudes values and corresponding phases, and discrepancies between CIVA and experiment (references: experimental values).
The figure below represents the C-scans obtained with the experiment and CIVA. They look similar.
Amplitudes, phases, real and imaginary parts as a function of the scanning are compared on figures below. A good agreement is observed between experiments and simulations.
Here below Lissajous curves show a good agreemnt between simulations and experiment,
Finally, the table below gathers ampltudes and phases values and confirms the very low gap between experiment and simulation, less than 1 dB.
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