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About: Acoustic tweezers     Goto   Sponge   NotDistinct   Permalink

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Acoustic tweezers (or acoustical tweezers) are used to manipulate the position and movement of very small objects with sound waves. Strictly speaking, only a single-beam based configuration can be called acoustical tweezers. However, the broad concept of acoustical tweezers involves two configurations of beams: single beam and standing waves. The technology works by controlling the position of acoustic pressure nodes that draw objects to specific locations of a standing acoustic field. The target object must be considerably smaller than the wavelength of sound used, and the technology is typically used to manipulate microscopic particles.