scholarly journals Comarison between the Echo-trace of Sea-bottom by the 14kc Echo-sounder and that by the Echo-sounder of Ultra High Frequency Sound Wave which has the Same Mechanism as the 14kc Echo-sounder

1959 ◽  
Vol 21 (0) ◽  
pp. 47-51
Author(s):  
T. Hashimoto ◽  
Y. Maniwa ◽  
M. Nishimura ◽  
I. Miyajima ◽  
S. Chino ◽  
...  
Keyword(s):  
Sound Wave ◽  
High Frequency ◽  
Ultra High Frequency ◽  
High Frequency Sound ◽  
Frequency Sound ◽  
Sea Bottom ◽  
Frequency Sound Wave ◽  
Echo Sounder

Ultra-High Frequency Sound Waves for Microparticle Separation

2015 ◽  
Author(s):  
Ghulam Destgeer ◽  
Anas Alazzam ◽  
Hyung Jin Sung
Keyword(s):  
Acoustic Waves ◽  
High Frequency ◽  
Surface Acoustic Waves ◽  
Microfluidic Channel ◽  
Sound Waves ◽  
Ultra High Frequency ◽  
High Frequency Sound ◽  
Frequency Sound ◽  
Sheath Fluid ◽  
Order Of Magnitude

In this study, we have demonstrated a particle separation device taking advantage of the ultra-high frequency sound waves. The sound waves, in the form of surface acoustic waves, are produced by an acoustofluidic platform build on top of a piezoelectric substrate bonded to a microfluidic channel. The particles’ mixture, pumped through the microchannel, is focused using a sheath fluid. A travelling surface acoustic wave (TSAW), propagating normal to the flow, interacts with the particles and deflect them from their original path to induce size-based separation in a continuous flow. We initially started the experiment with 40 MHz TSAWs for deflecting 10 μm diameter polystyrene particles but failed. However, larger diameter particles (∼ 30 μm) were successfully deflected from their streamlines and separated from the smaller particles (∼ 10 μm) using TSAWs with 40 MHz frequency. The separation of smaller diameter particles (3, 5 and 7 μm) was also achieved using an order of magnitude higher-frequency (∼ 133 MHz) TSAWs.

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