Normal incident ultrasonic beam transmission through a water-immersed plate using a piezoelectric transducer. Finite element modelling, angular spectrum method and measurement

Accurate time of flight (TOF) measurements in non-invasive ultrasonic applications for media contained by plane walls or pipes, demand a precise understanding and control of the generation, transmission and reception of sound beams through solid layers (plane walls or pipes) and the surrounding fluids.

Accurate time of flight (TOF) measurements in non-invasive ultrasonic applications for media contained by plane walls or pipes, demand a precise understanding and control of the
generation, transmission and reception of sound beams through solid layers (plane walls or pipes) and the surrounding fluids. The finite element method (FEM) is in the present work used to simulate the signal propagation through a system consisting of a piezoelectric source transducer and a water-immersed steel plate. Perfectly matched layers (PMLs) are used to confine the fluid regions subjected to FE calculations. Loss models are implemented for the materials in the transducer design as well as for the steel plate. Transmission results for sound beams at normal incidence are compared to a 3D angular spectrum method (ASM) with Lamb mode description in the plate, together with measurements. Comparisons are made for transfer functions and transient signals.

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