MODELING OF RECEIVED ULTRASOUND SIGNALS FROM FINITE PLANAR TARGETS

This paper presents a computational solution to the ultrasonic target- dependent spectral distortion for a finite planar target (FT-SD), The FT-SD predicts the spectrum of the output signal from the receiving tr ansducer generated in response to the insonification of a finite plana r specular target, as a function of incident angle, The transducer is assumed to be operating in pulse-echo mode, The development is made vi a scalar diffraction theory, in terms of the angular spectrum decompos ition of the acoustic source field, Numerical simulations of the FT-SD are presented for several reflector sizes and orientations, insonifie d by a planar circular piston transducer. Experimental verification of results for a finite square planar reflector is given for a range of reflector orientations.