| 摘要 |
<p>A non-contacting capacitive position transducer comprises a stator substrate carrying two electrically conducting inverted wedge regions (14, 16) whose whidth varies inversely in a sensing direction. A moveable pick-off (20) is capacitively coupled to both wedges. The wedges (14, 16) are driven with respective distinguishable time varying periodic waveforms, e.g. a sine wave and a cosine wave, and the pick-off voltage at (20) processed to determine the position of the pick-off in the sensing direction. Various condifurations of transducer are described, including those of linear, cylindrical and disc form. The pick-off voltage is preferably transferred from the pick-off (20) back to the stator by capacitively coupling the pick-off to a suitably screened pick-off track (36) on the stator.</p> |
