| 摘要 |
<p>An imaging device whereby the internal characteristics and/or external dimensions and/or location of an object are determined by one or more sensors (p1-p4) and optionally one or more slave members which may be driven in or out of phase to the sensors and which transmit an effect to the sensors directly and via the object to be characterised. The sensors (p1-p4) vary the frequency or amplitude of an oscillator (15) which contains a buffer/follower amplifier (7) and a Schmitt trigger (6). The slave members are typically driven via an inverter (9). Unused sensor lines are buffered via buffered switches (Sw1-Sw4). Connecting lines to a plurality of sensors or slave members pass through multiplexers (e.g. MUX1) with buffered power rails (P, G) in order to eliminate the internal capacitance to the voltage supply and ground rails.</p> |
