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Non destructive evaluation of windmill blades using ultrasound is a challenging task. Microstructure of fiberglass and resin composites (GFRP) introduces dispersive effects on ultrasound waves, which is seen as grain noise and produces high attenuation to ultrasonic signals.

In this work, results of the inspection of a thin GFRP layer (3mm) using phased-array technique are presented. The goal is to detect the presence of broken fibers in the material. A 5MHz array was used, along with a novel C-Scan processing technique, that allows to detect broken fibers with a resolution above 1 mm.

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