Shaping acoustic fields-based for cleaning method particulate contaminants in the inner wall of micro cavity
Traditional ultrasonic cleaning technology has been widely used for cleaning the external surfaces of devices.However,this technology is still in challenges for the inner surface of microdevices,such as nar-row gaps and microcavities.The main reason is that free microbubbles are difficult to trap and collapse at targeted positions of the inner cavity.This article proposes using shaping sound fields to manipulate the max-imum/minimum position of the gradient field in the inner cavity,then the induced acoustic radiation force can move and trap microbubbles near the inner wall of the cavity,after exciting the low-frequency and high-intensity ultrasonic field,these bubbles are collapsed near the inner surface of the cavity,thus,the inner surface of the cavity can be cleaned efficiently.This technology paves the way for cleaning precision devices,such as medical microtubes,optical instruments,and semiconductor chips.