02:56 Nov-08-2009 Mapping out ID cracks in plate in pipe
When mapping out ID cracks with shearwave ultrasound, does the standard 6dB drop method work? I just read an article that said the main reflector of an ID crack is actually the base of the crack. Well if that is the main reflector, would moving the transducer forward and backward until a 6dB drop was obtained in each direction give the actual throughwall depth of the crack? Or is a more advanced method like crack tip diffraction needed to measure the throughwall depth of the crack?
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