Method for controlling an ultrasonic sensor and ultrasonic sensor
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United States of America Patent
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Jun 24, 2014
Grant Date -
Apr 25, 2013
app pub date -
Apr 12, 2011
filing date -
Apr 15, 2010
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Abstract
An ultrasonic sensor has: a diaphragm that includes at least two partial regions for emitting and/or receiving ultrasonic signals, the two partial regions possessing different resonance characteristics; and at least one electromechanical transducer coupled to the diaphragm, to which transducer a control signal having at least two different control signal frequencies is applied. In this context, a first control signal frequency is in the range of a resonant frequency of a first partial region of the diaphragm, and a second control signal frequency is in the range of a resonant frequency of a second partial region of the diaphragm. Alternatively, two electromechanical transducers are used, which are coupled to a diaphragm and have different resonance characteristics.
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