Detecting a Dielectric Article

摘要

A device for detecting a dielectric object includes a first electrode and a second electrode. A first unit is configured to determine a first capacitance that exists between the first electrode and a common reference point and that is influenced by the object. A second unit is configured to determine a second capacitance that exists between the second electrode and the reference point and that is influenced by the object. The device further includes a control unit for actuating the first and second units and an evaluating unit that is configured to detect the object when the determined capacitances differ by more than a predetermined amount. The control unit is configured to actuate the units in such a manner that the capacitance determinations are carried out in succession. A switching unit is provided so as to electrically connect the electrode of the respective non-actuated unit to the common reference point.