| 摘要 |
A device for measuring pressure variations across a resonant acoustic wave, and providing an electrical feedback circuit to control the amplitude and phase of the wave front. The device relates to acoustic processing for physical manipulation of particles to achieve separation or concentration. The invention engages noise reduction approaches to correct distortions in the shape of acoustic processing mode. The device could comprise a transducer 3 and a reflector 2, with pressure probes 5 and a deformable plate (4). The noise reduction methods could include: spatial feedback to produce active control of nodal planes; temporal and spectral feedback to cancel components with high noise content; anchored pressure nodes to prevent motion; and, versatile mobile pressure nodes for species transport. The invention is aimed at circumventing detrimental noise issues associated with traditional acoustic wave separation, thereby improving the precision of particle (micron and sub-micron) localisation within microfluidic to production scale systems. |
