System for determining a distance between two movable elements by inductive coupling and related method

A system for determining a distance between two movable elements the system comprising a processor, an energy source and transmitting electrode and a receiving electrodes, the transmitting electrode and the receiving electrode being respectively fixed on the two movable elements, the energy source being further configured to generate a first electric current to the transmitting electrode so that the receiving electrode delivers, by inductive coupling, a second electric current in which:

• the transmitting electrode and the receiving electrodes are located less than 40 mm from each other and each include
• a magnetic core,
• a metallic winding having an inductance ranging from 1 μH to 470 μH,
• the processor is configured to convert the electric current delivered by the receiving electrode into an intensity value and to generate a measurement signal which includes said intensity value,
• the processor is further configured to carry out a digital processing of the measurement signal to obtain an estimate of the distance between the two movable elements, from a mathematical law which links the distance between the two movable elements and the intensity value included in the measurement signal.