| 摘要 |
<p>A transducer (60) for providing distance or position information about a target relative to the transducer, the transducer (60) comprising a first resistor and a first electrode (21) for forming a first capacitive coupling with a target, a second resistor and a second electrode (23) for forming a second capacitive coupling with the target, means (25, 27) for applying signals of opposite phase or of opposite polarity to the respective resistor and electrode combinations and processing means (33, 45) for processing the voltages appearing across the first and second electrodes (21, 23) to produce an output indicative of the distance or position of the target relative to the transducer (60). By applying signals of opposing phase or opposing polarity, no net signal is applied to the target, thereby avoiding problems with cross talk between adjacent transducers.</p> |
