Particle separation
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United States of America Patent
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Jun 16, 1987
Grant Date -
N/A
app pub date -
Jul 5, 1985
filing date -
Jul 6, 1984
priority date (Note) -
Expired
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Abstract
The separation of different types of particulate matter in a carrier liquid is obtained by using an ultrasonic standing wave and relying on the different acoustic responses of the different particle types. By varying the acoustic energy propagation cyclically a more effective separation rate can be obtained, with a more readily attracted particle type being subjected to a further discrimination step in each cycle. The cyclical energy variation may be in the intensity of the standing wave, e.g. using suppression means, and/or the velocity of the standing wave relative to the liquid medium, e.g. using phase control means.
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