An inverse design method of the acoustic lens

The traditional forward and inverse diffraction iterative lens design method that replaces the amplitude according to the desired sound field distribution can achieve most sound field distributions under unitary conditions. However, when the sound field distribution we desired contains a sharp plane with abrupt changes, the traditional method will ignore the severe energy loss of the truncated plane. The designed lens will produce a ringing effect, which reduces the quality of the lens. Inspired by the Yang Gu algorithm that can be applied to non-unitary conditions, this paper proposes an acoustic lens design method based on a simulated annealing particle swarm algorithm to overcome the shortcomings of traditional forward and inverse iterative algorithms. The feasibility of this method is verified by designing a lens with a flat-top sound pressure. This paper provides a more widely applicable method in an acoustic lens design.