Two-Dimensional Visualization of Intense Ultrasound Field using Confined Particle Movement Caused by Radiation Pressure Field

This paper presents an easy-to-use visualization apparatus for high intensity midair ultrasound field. In many applications of such high-power ultrasound that have been devised so far, construction of minutely designed ultrasound field is crucially important for their performance to the degree of practical use. However, adjustment of generated ultrasound fields has been not an easy task because ultrasound is invisible, and visualization of such fields usually requires scanning of microphones. My proposed method just utilizes passive mechanical component that consists of lightweight polystyrene beads confined between two layers of acoustically translucent membranes. This paper describes how ultrasound fields are visualized with my method and gives theoretical insights for the observed phenomenon.