Acoustic impedance matching using 3D printed lenses

This bachelor thesis is an investigation into the optimal layer thickness and impedance profile for a multilayer anti-re ection ultrasound lens, based on simulations using the transfer matrix method. Simulation results show the biggest decrease in re ection for a discretised exponential impedance matching profile with layer thicknesses proportional to the corresponding sound speeds. The model is validated through measurements with relatively simple 3D-printed test structures. The comparison of simulation results to the measurements suggests that the model is valid for the measurement ranges used. Based on the characterisation results, it is not feasible to 3D-print an anti-re ection ultrasound lens with the currently available printer and materials; therefore the validity of the model to such a lens also has not been verified.