Micromachined ultrasound-based proximity sensors
by Mark R. Hornung, Mark R. Hornung, Oliver Brand · 1999

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Proximity detectorsUltrasonic transducersMicroelectromechanical systemsElectronic devices & materialsPrecision instruments manufactureElectronic Apparatus And DevicesEngineering InstrumentsTechnologyTechnology & Industrial ArtsScience/MathematicsEngineering - MechanicalTechnical & Manufacturing Trades