| 摘要 |
A capacitive sensor comprises an array of conductive plates (2, 2') configured to form a capacitive coupling (Ci,j) as a function of a medium (3, 5) to be sensed, a plurality of sensor circuit units (Ui,j) associated with the capacitive elements, the circuit units each including an inverter (Iij) and exhibiting a respective time constant (ti,j) as a function of the capacitive coupling of the medium being sensed with the respective plate (2, 2'), the sensor circuit units (Ui,j) being interconnected in a ring oscillator that oscillates at a frequency (f) dependent on the time constants of the circuit units. <IMAGE> |
