INDUCTIVE SENSOR Russian patent published in 2010 - IPC G01B7/14 

FIELD: measurement equipment.

SUBSTANCE: invention relates to displacement sensors, in particular - to those registering displacement of any two objects relative to each other. The sensor consists of two parts capable of displacement relative to each other. The first part contains frame antennas, the transmitting one and the receiving one, connected to an AC source and a signal processing unit accordingly. The second part consists of a frame receiving antenna connected to a non-linear element, two capacitors and a frame transmitting antenna consisted of a frame(s) electrically interconnected. The non-linear element is represented by a single or double wave rectifier whose inputs and outputs are connected to the receiving and the transmitting frame antennas accordingly. The first capacitor is connected to the receiving frame antenna and forms a resonance circuit whose resonance frequency is equal to the AC source frequency. The second capacitor is connected to the transmitting frame antenna and forms a resonance circuit whose resonance frequency exceeds the AC source frequency by a factor of two. The axis of frame coils of the one part transmitting antenna is parallel to the axis of frame coils of the other sensor part receiving antenna. The axes of the frame coils of the receiving and transmitting antennas in each of the inductive sensor parts are positioned within mutually perpendicular planes.

EFFECT: enhanced sensibility, sensor design simplification and reliability improvement.

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