Distance-detection system for determining a time-of-flight measurement and having a reduced dead zone

摘要

Distance-detection system includes a signal-generator configured to provide a drive signal and an ultrasound transducer having at least one ultrasonic element. The ultrasound transducer is configured to transmit a pulse of sound waves and detect reflected sound waves. The distance-detection system also includes a receiver configured to receive a detection signal from the ultrasound transducer. The detection signal includes a reverberation component representing reverberation of the ultrasound transducer and a reflected component representing reflected sound waves from the interface. The receiver is configured to receive a drive-cancellation signal that is inverted with respect to the reverberation component of the detection signal. The receiver is configured to determine a time-of-flight measurement based on the detection signal in which the reverberation component of the detection signal is reduced by the drive-cancellation signal.