| 摘要 |
The invention relates to an ultrasonic sensor (10) for measuring the distance of an object, having a housing (20) and a damping compound (21). The latter at least partly fills the housing (20). The ultrasonic sensor (10) further comprises a membrane (30), a piezoceramic (40) and an electric contact member (22). The electric contact member (22) comprises at least one electrode (23) and a ground electrode (25). Furthermore, the piezoceramic (40) is divided into at least three segments (41, 42, 43), wherein a first segment (41) is connected to the ground electrode (25) and contact is respectively made with a second (42) and a third segment (43) via separate electrodes (23, 24). The invention further relates to a method for measuring an object distance by means of an ultrasonic sensor (10) having a piezoceramic (40), the rear side (31) of which has a first segment (41), a second segment (42) and a third segment (43). The method comprises a method step in which an opposing vibration is introduced into the vibrating membrane (30) by means of the second segment (42).
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