Resonance Acoustic Concentration of Suspended Particles for Optical Discrimination of Aerosols
LOS ALAMOS NATIONAL LAB NM
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Acoustic concentration of aerosols has received much attention over the past several decades. Typical concentration devices rely on acoustic levitation techniques to localize particles near the nodal planes of an acoustic standing wave. The standing wave field is typically very dependent upon spatial alignment of the system components and often requires moderate to high input drive power levels. The present research describes an extremely simple acoustic levitation device for use in optical discrimination of aerosols in air. It is constructed from a hollow, cylindrical piezoelectric which has been slightly modified to increase the amplitude of the radial surface displacements. An acoustic standing wave is created on the interior cavity of the shell where particle concentration takes place at the nodal planes of the field. This levitation device is extremely useful since it requires no alignment, power consumption is small 1 Watt, and hollow PZT cylinders are commercial-off-the-shelf items.
- Physical Chemistry