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We are investigating means of handling microparticles in microfluidic systems, in particular localized acoustic trapping of microparticles in a flow-through device. Standing ultrasonic waves were generated across a microfluidic channel by ultrasonic microtransducers integrated in one of the channel walls. Particles in a fluid passing a transducer were drawn to pressure minima in the acoustic field,...
This paper presents a theoretical model describing the transfer characteristics of a bilaminar polyvinylidene fluoride membrane hydrophone. The model applied uses a matrix formulation for one-dimensional propagation in multi-layered media. Arbitrary interconnections of piezoelectric layers are possible. The electrical transfer characteristics of the hydrophone leg and cable are modelled as transmission...
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