Inductive displacement sensor with an air coil and a core plunging into the air coil, the in each case instantaneous length of engagement of which is to be sensed

摘要

The invention relates to an inductive displacement sensor having two magnetic circuits which are largely decoupled from one another, of which a core controlling the in each case electromagnetically effective length of displacement determines the ratio of inductances of the magnetic circuits in at least one circuit and the ratio of inductances is preferably determined by measuring the frequency ratio between two oscillator frequencies, the inductances of the magnetic circuits in each case being connected, largely decoupled from one another, in a frequency determining manner in an oscillator. The sensor according to the invention senses in a directly integrating manner and the core to be sensed must not be tightly enclosed by the coil. The sensor is therefore particularly suitable for directly sensing floating bodies.