The comparison of probes for the in-spection of cladding shows a remarkable fact: depending on the reflectors used, a different performance characterization of the probe must be expected. It seems important for performance demonstration trials — especially those including the under-clad area — to use reflector types as close as possible to the real cracks to be detected. For different detection approaches, reflectors representing underclad cracks should have a reduced diffraction at the crack tip areas in order to check their potential to detect the indication based on surface reflections of the ultrasonic waves.
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