Section view of the single-axis ultrasonic levitator. The pressure field (right) was numerically computed using boundary elements, and the resulting Gor’kov potential for a small rigid sphere is shown on the left.

Section view of the single-axis ultrasonic levitator. The pressure field (right) was numerically computed using boundary elements, and the resulting Gor’kov potential for a small rigid sphere is shown on the left.