Optical measurement of acoustic radiation pressure of the near-field acoustic levitation through transparent object

摘要

It is known that macroscopic objects can be levitated for few to severalhundred micrometers by near-field acoustic field and this phenomenon is callednear-field acoustic levitation (NFAL). Although there are various experimentsconducted to measure integrated acoustic pressure on the object surface, up tonow there was no direct method to measure pressure distribution. In this studywe measured the acoustic radiation pressure of the near-field acousticlevitation via pressure-sensitive paint.