【摘 要】
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Background, Motivation and Objective The well-known non-linear effect of acoustic radiation pressure, present in front of an emitting ultrasonic transducer, results in a net force that pushes the tran
【机 构】
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BTU Cottbus-Senftenberg, Germany Technische Unive
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Background, Motivation and Objective The well-known non-linear effect of acoustic radiation pressure, present in front of an emitting ultrasonic transducer, results in a net force that pushes the transducer in the opposite direction. In immersion, this force is quite large (mN-range), and, thus, relatively simple to measure. An interesting example, described in [Tan et al., OCEANS 2010], uses the effect to generate acoustic thrust to maneuver small vessels, diving in water. In air, however, the resulting forces acting on the ultrasonic transducer is about one order of magnitude smaller (μN-range), due to the low density of air compared to water. Usual air-coupled transducers weigh several grams, aggravating a direct measurement on a sensitive scale or in some other form of force measurement setup. Therefore, we present proof-of-concept measurement results from a simple indirect method that allows us to determine such small resulting forces.
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