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The four-port acoustic wave device showing acoustic alignment of particles in a fluidic capillary formed from a glass cover-slip, with (1) Marconi 2022E rf signal generator, (2) minicircuits ZHL-1–2W power amplifier, and (3) power splitter.
Micrographs taken at magnification of particles confined within the fluidic channel (a) prior to and (b) after activation of two orthogonal SAWs, and (c) line profiles taken at different times after activation of the two standing waves, showing the evolution of a single node of particles. Each trace is offset vertically by 30 units for clarity.
(a) A magnified portion of Fig. 2(b) , with lines indicating the paths used for measuring node separation in the array. (b) The line profiles generated in the (dashed) and (solid) directions.
(a) Graphs of the line profiles taken over a single horizontal row of nodes at frequencies increasing from 32.4 to 34.0 MHz, in steps of 0.4 MHz, with each vertically offset by 80 units for clarity. (b) Plots of the measured node separation as a function of frequency taken along the -(triangles) and -axes (circles), where the solid and dashed lines correspond to the expected separations calculated from the acoustic velocity along the appropriate axis.
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