Ultrasonic Imaging of Immersed Objects using Migration Techniques

Conference: EUSAR 2010 - 8th European Conference on Synthetic Aperture Radar
06/07/2010 - 06/10/2010 at Aachen, Germany

Proceedings: EUSAR 2010

Pages: 4Language: englishTyp: PDF

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Olofsson, Tomas; Barkefors, Annea (Dept. of Engineering Sciences, Uppsala University, Sweden)
Skjelvareid, Martin Hansen (Dept. of Physics, University of Tromsø, Norway)

The synthetic aperture focusing technique (SAFT) is often used for imaging in non-destructive ultrasonic testing. Conventional SAFT is well suited for contact testing of homogeneous objects because of the constant sound speed throughout the media, whereas the refraction present in the practically important case of immersion tests has so far prevented a widespread use of SAFT for such data. Fortunately, the problem of imaging layered objects has been extensively treated in geophysics where migration is used routinely for this kind of problems. This paper shows how such techniques can also be successfully applied to data from ultrasonic immersion tests.