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Using appropriate models and synthetic data to study the properties of TFM ultrasonic imaging

: Mora, Pierric; Spies, Martin

Merck, Peter (Ed.) ; European Federation for Non-Destructive Testing -EFNDT-:
12th European Conference on Non-Destructive Testing, ECNDT 2018. Proceedings : Gothenburg, Sweden, 11-15 June 2018; CD-ROM
Gothenburg: Sweden MEETX AB, 2018
ISBN: 978-91-639-6217-2
Paper ID-ECNDT-0375-2018, 2 pp.
European Conference on Non-Destructive Testing (ECNDT) <12, 2018, Gothenburg>
Conference Paper
Fraunhofer IZFP ()

We investigate the imaging capabilities of the Total Focusing Method (TFM) by addressing side-drilled holes (SDH) as model defects. For simulating the data acquisition by an array transducer we use a 2D-Fraunhofer approximation. For the scattering of the ultrasonic waves at the SDH we use two model approaches - a Kirchhoff-type far-field approximation and the Separation of Variables method as an exact technique. On this basis we simulate time-domain ultrasonic data for various scenarios where the defect parameters SDH diameter and distance between two SDHs are varied. Addressing a commercial contact phased array probe we generate synthetic data to perform TFM imaging, also addressing the influence of noise on the image quality. We also report on further results obtained e.g. in simulating data acquisition using immersion technique, the transmission through an interface is modelled using ray theory. Investigations on the basis of synthetic data help in evaluating the performance of such imaging techniques for specific inspection situations under concern.