Hybrid positioning electromagnetic induction displacement sensor

A hybrid positioning electromagnetic induction displacement sensor, the sensor comprising a transceiver board (1) and an excitation board (2) that may move relative to each other along a measuring path, wherein

• the transceiver board (1) is arranged with a measurement circuit and at least one transmitter winding extending along the measuring path, each transmitter winding respectively encircles a first pitch three-phase receiver winding and a second pitch three-phase receiver winding by using two approximately closed rectangular coils in the same direction in series, each three-phase receiver winding comprises three phase windings with the same structure and a phase difference of 120° in sequence, both the transmitter winding and the three-phase receiver winding being connected to the measurement circuit;
• the measurement circuit comprises a central control unit, an interface unit, and a measurement unit, the central control unit comprising a microcontroller (13), and the interface unit comprising a key input circuit, a liquid crystal drive circuit, a measurement interface circuit, and a power source conversion circuit that are connected to the microcontroller (13);
• and
• the excitation board (2) is arranged with at least two rows of excitation coils that extend along the measuring path, wherein the number of excitation coils is equal to that of the three-phase receiver windings on the transceiver board (1), each row of excitation coil and a corresponding three-phase receiver winding on the transceiver board (1) have the same pitch and coincided center lines respectively, and a length along the measuring path is half of a respective pitch.