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Scanning laser source and scanning laser detection techniques for different surface crack geometries

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Figure

FIGURE 1 . Experimental set-up. The laser generation and/or detection points are scanned across an aluminium sample containing a surface defect
  FIGURE 2. Dependence of the out-of-plane signal enhancement on the angle of the defect (shown in figure 1) for d/λ=1.11, laser source (circles) or laser detection (triangles) scanned over defect
FIGURE 3 . FEM: B-Scan of laser detection scanned along an aluminium wedge, of angle 10°
FIGURE 4. (a) Calculation of arrival time of bulk wavemodes for a wedge. (b) Zoom-in section of the far-field in figure 3, showing the calculated arrival times
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