| 摘要 |
The invention relates to a method for detecting an object in a near field of an ultrasonic sensor. The method comprises the steps of exciting a sound transducer of the ultrasonic sensor by means of a transmission signal, capturing a decay signal (1), which describes the decay behavior of the sound transducer after the excitation of the sound transducer, determining a deviation between the decay signal (1) and a reference decay signal (2), and detecting the presence of an object in the near field of the ultrasonic sensor on the basis of the determined deviation. Thus, objects in a near field of the ultrasonic sensor and under a measuring range of the ultrasonic sensor can be reliably detected. A near field is a field in front of the sound transducer of the ultrasonic sensor in which an exact measurement by means of the pulse-echo method is not possible, because the decay signal is superposed on an echo of the transmission signal. |
