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Measuring the local pressure amplitude in microchannel acoustophoresis
Lab on a Chip
A new method is reported on how to measure the local pressure amplitude and the Q factor of ultrasound resonances in microfluidic chips designed for acoustophoresis of particle suspensions. The method relies on tracking individual polystyrene tracer microbeads in straight water-filled silicon/glass microchannels. The system is actuated by a PZT piezo transducer attached beneath the chip and driven by an applied ac voltage near its eigenfrequency of 2 MHz. For a given frequency a number ofdoi:10.1039/b920376a pmid:20162231 fatcat:zgkwwap7y5flrgw76gxsi2l6mm