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Reliability of Reconstruction of Arbitrarily Oriented Flaws Using Multiview Transducers

Some basic problems associated with the reconstruction of arbitrarily oriented flaws using an automated multiviewing ultrasonic transducer system and its associated signal-processing algorithms are addressed. The effects of aperture size on the reconstruction reliability are investigated by computer simulation, and experimental results are presented for the reconstruction of arbitrarily oriented oblate and prolate spheroidlike flaws. The multiviewing capability of the system is used to determine a spatial data-acquisition pattern which improves the reliability of reconstruction by optimizing the illumination of the flaw surface by the multiviewing transducer and the signal-to-noise ratio of the scattering signal.