Capacitative sensor has an evaluation unit, for the characteristic signal on charging/discharging the impedance and condenser, for evaluation to tune the impedance
摘要
<p>The capacitative sensor (1) has at least one reference impedance and at least one measurement condenser (3). The reference impedance and the condenser are connected to an alternating electrical signal source (4) through the current supply network (5). The charging/discharging currents at the impedance and condenser give a characteristic signal for evaluation (6) to tune the impedance.</p>