Analysis of the modeling of echo responses from circular concavity defects using impulse response and discrete representation methods

AbstractIn this work the impulse response and the discrete representation method are applied to model the acoustic wave generated by ultrasonic transducers, its interaction with the defect, and the echoes received by the transducer. Several simulations are performed to determine the echo responses arising from a concave circular defect on a plane surface, using a planar circular piston emitting pulses in water. The simulations are calculated using the Matlab software. The effects of defect size and field position on both amplitude and shape of the echo responses are investigated. Moreover, experimental measurements of the acoustic field are compared with the simulations. The experimental results, based on the above-mentioned process, were obtained using 1.6 and 2.25MHz transducers