Fig. (2) Numerical Cylindrical Elastodynamic Finite Integration Technique (CEFIT): Simulation of the acoustic wave field in reflection SAM at an idealized water/steel interface lying at the geometrical focal point of the transducer. The temporal snapshots display the absolute value of the particle velocity vector using a linear grayscale: (A) wavefront after radiating from transducer; (B) wavefront approaching the solid/liquid interface; (C) reflection of the wavefront form solid/liquid interface; (D) wavefront travelling back to the transducer after reflection from the interface. The center frequency of the input pulse is 25 MHz. The half-aperture angle of the transducer amounts to 60°, and its focal length is 924 μm. The temporal snapshots display the absolute value of particle velocity using a linear grayscale (images are courtesy of Frank Schubert, Fraunhofer IKTS, Dresden, Germany).