VERFAHREN ZUR MESSUNG EINER INDUKTIVITAET EINES INDUKTIVEN SENSORS.

摘要

An electronic circuit measures the distance dependent variation of the inductance of a coil (1) whose core is displaced w.r.t. it. The electronic circuit contains a microcomputer (3) which stimulates the coil with a voltage step. It evaluates the displacement dependent inductance from the resulting charging current using a time measurement . The coil charging current is used to charge up a capacitor (7). The capacitor discharges across a resistor (8) with a time constant large compared to the charging time. The discharge time is evaluated by the microcomputer to produce the distance dependent parameter.