CONTACTLESS SENSOR FOR DETERMINING ROTOR DISPLACEMENTS Russian patent published in 2018 - IPC G01B7/31 

FIELD: measuring equipment.

SUBSTANCE: invention relates to a measuring technique and is intended for measuring rotor characteristics, in particular rotor displacements. Essence: two sensing coils (612, 614) interact with the surfaces of the rotor. Bridge circuit is formed by sensing coils and two secondary windings (212, 213) of the input transformer (210). Primary winding of the input transformer receives an excitation signal. Output signal is obtained at the output formed by the common node between sensing coils (612, 614) and the common node between the secondary windings of the input transformer. Thus, the excitation and detection circuits are separated. If cables are used for connecting the bridge circuit to signal processing circuitry, the input and output impedances of the bridge circuit can be matched to the characteristic impedance of the cables. Output transformer can be connected to the output tap. Roles of the input and output transformers can be interchanged.

EFFECT: simplicity, possibility of use with long cables.

22 cl, 10 dwg